XI International Conference on New Frontiers in Physics
Conference venue: OAC conference center, Kolymbari, Crete, Greece. The conference will take place in Crete in physical form, however participation is also possible via internet
XI International Conference on New Frontiers in Physics (ICNFP 2022)
| 30 August | 31 August | 10 September | 11 September |
| ⬤ | ⬤ | ⬤ | ⬤ |
| Arrival & Lectures day |
Opening of the main plenary session |
Closing of the conference | Departure day |
The International Conference on New Frontiers in Physics aims to promote scientific exchange and the development of novel ideas in science with a particular accent on interdisciplinarity. The conference will bring together worldwide experts and promising young scientists working on experimental and theoretical aspects of particle, nuclear, heavy ion and astroparticle physics and cosmology, with colleagues from other disciplines, for example, solid-state physics, mathematics, mathematical physics, quantum optics and other.
The conference will be hosted in the Conference Center of the Orthodox Academy of Crete (OAC), an exceptionally beautiful location only a few meters from the Mediterranean sea.
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13:00
Lunch
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Lectures Room 1
Room 1
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Could Einstein Have Been Right After All?
One of the most surprising aspects of quantum theory is that it tells us that we live in a nonlocal universe in which random correlations seem to appear instantaneously between arbitrarily distant locations. This idea was completely abhorrent to Einstein, who dismissed it as "spooky action at a distance". So-called loophole-free experiments have confirmed nonlocality beyond any reasonable doubt in 2015. But have they really? In this talk, I shall argue that no experiment whose purpose is to confirm the predictions of quantum theory can possibly be used as an argument in favour of nonlocality because any theory of physics that does not allow instantaneous signalling to occur and has reversible dynamics (such as unitary quantum theory) can be explained in a purely local and realistic universe. What if Einstein was right after all?... Once again!
No prior knowledge of quantum theory will be assumed.
This talk is based on the original doctoral work of Paul Raymond-Robichaud while under my supervision. The proof of concept was published in the journal Entropy and is available open access at https://doi.org/10.3390/e21010087. More involved mathematics can be found in https://doi.org/10.1098/rspa.2020.0897 and culminates in https://arxiv.org/abs/1710.01380.Speaker: Gilles Brassard -
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A Borexino breakthrough: first identification of fusion reactions that power the Sun and the stars
The Borexino experiment, unique in the world for its radiopurity, in the last 15 years has answered to the humanity's primordial question about the nature of the Sun and the stars.
Already in the ‘30s of the last century, Hans Bethe and Carl Friedrich von Weizsäcker hypothesized the chain and the cycle of fusion reactions that power Sun and stars. The individual fusion reactions never have been measured, identified and confirmed (except one of them) until the Borexino experiment succeeded to measure the reactions of the pp chain, which produces 99% of the Sun energy, and of the CNO cycle, subdominant in the Sun (1%), but primary channel for hydrogen burning in massive stars, and in fact primary channel for hydrogen burning in the Universe. Also the CNO cycle never had a confirmation up to the Borexino experimental determination, allowing also to solve the long standing metallicity puzzle of the Standard Solar Model.
In this talk the experimental and analysis techniques are presented as well as the final results that have allowed to reach these historic breakthroughs.Speaker: Prof. Gianpaolo Bellini (University and INFN Milano - Italy)
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2
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16:30
Coffee break
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Lectures Room 1
Room 1
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Linking, number partitioning, and entanglement
The Borromean rings, a type of topological link, and the quantum GHZ state share a common feture. Cutting out or removing one of the components in the Borromean rings leaves the two others unlinked. Analogously, tracing out the Hilbert space of one of the subsystems in the GHZ yields a separable state. Aravind, Kauffman and others put forward the question if such an analogy may be used to map quantum states in a way similar to graph states. The relation between topological linking and quantum entanglement is an interesting concept in its own right; One may wonder what would be the quantum mechanical analog of topological equivalence of knots and links. In this work, we present some new results connecting topological linking and entangled quantum states. In particular, we construct a quantum state analog of the Brunnian links, of which the Borromean rings is the simplest case.The newly constructed states have the property of becoming uncorrelated upon tracing out any one of the subsystems.
Our approach relies on a unique representation of number partitioning — the problem of determining whether or not a set of integers may be partitioned into two subsets having the same sum. This problem is sometimes referred to as the easiest NP-complete problem for having a pseudo-polynomial time dynamic programming solution. The idea is to construct a n- partite quantum state based on a set of n integer numbers, which is necessarily entangled if the set of numbers admit a balanced partitioning, and is uncorrelated otherwise. The distinguished feature of the Brunnian links may, at that point, be readily translated into number partitioning: a set of numbers admitting a balanced partitioning of which the subsets have no partition. The Borromean rings, for instance, may correspond to a state encoded by the set {1,2,3}. Indeed, this set has a balanced partition, {1,2} and {3}. Removing any one of the numbers from this set yield the subsets {1,2}, {1,3}, or {2,3}, none of which have a partition. Similarly, the 4-component Brunnian link corresponds to {2,3,4,9}. Our scheme for constructing the mentioned quantum states shows that the Brunnian linking property may be translated into partitioning which may be further translated into quantum entanglement, or concisely written: topological linking —-> balanced partition exists —> entangled state, and unlink —-> unbalanced partitioning —-> uncorrelated state.
We discuss the implications of this new construction in the context of topological quantum information.
References:
P. K.Aravind, Borromean entanglement of the GHZ state. in ‘Potentiality,Entanglement and Passion-at-a-Distance”,ed.by R.S.Cohenetal,p p.53-59, Kluwer,1997.
Louis H Kauffman and Samuel J Lomonaco Jr, Quantum entanglement and topological entanglement, 2002 New J. Phys. 4 73
Speaker: Avishy Carmi -
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Unexpected Planetary relationships of unexpected observations as the new signature in astro-particle physics
The discovery of dunkle Materie (DM) by ZWICKY came from unexpected cosmological observations. The last ~160 years a number of unexpected energetic observations could be the manifestation of the dark Universe dubbed here as “invisible” to distinguish it from WIMPs and axions. In this work we stress a simple feature as a common signature of such observations within the solar system. Namely, the widely discussed dark sector constituents have speeds of ~1‰ c (c=velocity of light). As pointed out before, streams of constituents with such velocities can be gravitationally focused or deflected by any solar system body to other one. The aforementioned energetic observations include the unpredictable flaring Sun, its irradiance, its size variation, its elemental composition, and, terrestrial phenomena from the inner Earth and its dynamic atmosphere. In addition, highly crossdisciplinary observations will be mentioned which also follow otherwise unexpected planetary relationships. More results may come out until the conference following more out-of-the-box investigations including exo-solar planetary systems. Thus, a planetary relationship is the key signature pointing at exo-solar origin. The only viable explanation is planetary gravitational focusing of streaming invisible matter, which We tentatively identify with constituents from the dark Universe. Implications in DM research will be addressed.
Further reading: https://arxiv.org/abs/2108.11647; https://arxiv.org/abs/2106.15408 ; https://arxiv.org/abs/2202.04447; https://arxiv.org/abs/2004.11006 ;https://arxiv.org/abs/1309.4021 ; https://arxiv.org/abs/1703.01436 ; https://arxiv.org/abs/1602.03666 ;Speaker: Konstantin Zioutas (University of Patras (GR))
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4
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20:00
Dinner
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21:00
Welcome Drink
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13:00
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Cosmology, Astrophysics, Gravity, Mathematical Physics Room 1
Room 1
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Cosmology, fundamental physics and Multi-Messenger Astrophysics with Gamma-Ray Bursts
Gamma-Ray Bursts constitute one of the most fascinating and relevant phenomena in modern science, with strong implications for several fields of astrophysics, cosmology and fundamental physics. Indeed, the huge luminosity, the redshift distribution extending at least up to z~10 and the association with the explosive death of very massive stars make long GRBs (i.e., those lasting up to a few minutes) potentially extremely powerful probes for investigating the early Universe (pop-III stars, cosmic re-ionization, SFR and metallicity evolution up to the "cosmic dawn") and measuring cosmological parameters. The combination of extreme distances, the huge number of photons emitted over about three orders of magnitude in photon energy and the variability down to few ms makes these phenomena also a uniquely powerful and promising tool for performing tests of fundamental physics like Lorentz Invariance Violation (LIV) with unprecedented accuracy. At the same time, as demonstrated by the GW170817 event, short GRBs (lasting no more than a few s) are the most prominent electromagnetic counterpart of gravitational-wave sources like NS-NS and NS-BH merging events, and both long and short GRBs are expected to be associated with neutrino emission. My review will include the status, concepts and expected performances of space mission projects (e.g, THESEUS, Gamow Explorer) aiming at fully exploiting these unique potentialities of the GRB phenomenon, thus providing an ideal synergy with the large e.m. facilities of the future like LSST, ELT, TMT, SKA, CTA, ATHENA in the e.m. domain, advanced second generation (2G++) and third generation (3G) GW detectors and future large neutrino detectors (e.g., Km3NET).
Speaker: Lorenzo Amati (INAF - OAS Bologna) -
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Instantons: thick-wall approximation
We develop a new method for estimating the decay probability of the
false vacuum via regularized instantons. Namely, we consider the case where the potential is either unbounded from below or the second minimum corresponding to the true vacuum has a depth exceeding the height of the potential barrier. In this case, the materialized bubbles dominating the vacuum decay naturally have a thick wall and the thin-wall approximation is not applicable. We prove that in such a case the main contribution to the action determining the decay probability comes from the part of the solution for which the potential term in the equation for instantons can be neglected compared to the friction term. We show that the developed approximation exactly reproduces the leading order results for the few known exactly solvable potentials. The proposed method is applied to generic scalar field potentials in an arbitrary number of dimensions.Speaker: Prof. Alexander Sorin (Joint Institute for Nuclear Research, Dubna)
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7
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10:30
Coffee break
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Heavy Ion Collisions and Critical Phenomena Room 1
Room 1
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Performances of the ALICE detector with first pp collisions from LHC Run 3
The ALICE experiment has undergone major upgrades during the LHC long shutdown 2, to make both detectors and computing infrastructure cope with the increased luminosity of LHC in Run 3 (2022-25).
The Inner Tracking System and the Time Projection Chamber have been significantly upgraded and new Muon Forward Tracker and Fast Interaction Trigger detectors have been installed. Also, the readout of all detectors has been upgraded and the data acquisition and analysis infrastructure has been completely redesigned to allow for continuous readout and synchronous reconstruction.
In this presentation a description of the upgrade will be given and detector performance and preliminary physics outcomes of the experiment will be shown, obtained with the first successful pp collisions delivered during the so called "pilot beam" periods at 900 GeV at the beginning of LHC Run3.Speaker: Elena Botta (Universita e INFN Torino (IT))
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High Energy Particle Physics Room 1
Room 1
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Performance of ATLAS detector with start of run-3
The ATLAS detector performance in LHC run 3
Speaker: Pawel Jan Klimek (CERN) -
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An overview of more than ten years of operation of the CMS ECAL
The CMS Electromagnetic Calorimeter (ECAL) is the largest crystal calorimeter operating in a high energy physics experiment. Since its installation in CMS, it has made fundamental contributions to the CMS physics program by precisely measuring the energy, position, and timing of photons, electrons, and hadronic jets. The excellent ECAL energy resolution facilitated the observation of the Higgs boson in its two photon decay mode in 2012. These important results have been achieved due to the continuous efforts to improve the detector hardware, firmware, and software, as well as the energy and timing reconstruction and calibration methods that have been continuously developed and evolved to exploit the full potential of the calorimeter.
A high-level historical overview of the design, construction, and operation of the ECAL over more than 10 years of operation will be presented. The talk will review the initial expectations for detector performance and the plans for operation. These expectations will then be compared to the actual performance achieved during LHC operations. The techniques that have been developed and exploited to maintain the highest operational efficiency and achieve the ultimate energy resolution will also be described. In particular, in-situ crystal and photodetector performance, trigger performance, energy resolution, and timing resolution will be addressed. The impacts of ageing on detector performance and the challenges of monitoring and correcting for these effects will also be highlighted. The talk will summarise the lessons learned during the construction and operation phases of the calorimeter, with a prospective look at crystal calorimeters for future colliders.
Speaker: Amina Zghiche (CNRS/IN2P3/LLR-Polytechnique (FR))
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10
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High Energy Particle Physics Room 1
Room 1
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Recent results from Belle II
The Belle II experiment at the SuperKEKB energy-asymmetric e+e− collider is a substantial upgrade of the B factory facility at the Japanese KEK laboratory. The design luminosity of the machine is 6×1035 cm−2s−1 and the Belle II experiment aims to ultimately record 50 ab−1 of data, a factor of 50 more than its predecessor. With this data set, Belle II will be able to measure the Cabibbo-Kobayashi-Maskawa (CKM) matrix, the matrix elements and their phases, with unprecedented precision and explore flavor physics with B and charmed mesons, and τ leptons. Belle II has also a unique capability to search for low mass dark matter and low mass mediators. In this presentation, we will review the latest results from Belle II, with emphasis on those related to lepton flavour violation.
Speaker: Dr Riccardo de Sangro (Laboratori Nazionali Frascati INFN)
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Heavy Ion Collisions and Critical Phenomena Room 1
Room 1
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Search for the Chiral Magnetic Effect by the STAR Experiment
The quark-gluon plasma created in high-energy heavy-ion collisions has been conjectured to exhibit a spontaneous electric-charge separation in the direction of a strong magnetic field through the chiral magnetic effect (CME). The experimental confirmation of the CME in heavy-ion collisions will uncover fundamental aspects of strong interaction physics such as the QCD chiral symmetry restoration and the topological configurations of non-Abelian gauge fields. Over the past decade, the STAR experiment has performed a series of charge-separation measurements in Au+Au collisions at various beam energies from $\sqrt{s_{\rm NN}} =$ 200 GeV down to 7.7 GeV, and in different collision systems including p+Au, d+Au, Cu+Cu, Au+Au and U+U collisions, as well as the recent isobaric Ru+Ru and Zr+Zr collisions. Multiple analysis methods have also been developed to manifest the charge separation effect and suppress the flow related background. In this talk, we will review the aforementioned results, summarize our current understanding, and provide an outlook on future analyses.
Speaker: Prof. Gang Wang (UCLA)
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13:00
Lunch
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15:00
Coffee break
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Cosmology, Astrophysics, Gravity, Mathematical Physics Room 2
Room 2
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The DarkSide-20k experiment: status and scientific program
A vast body of astrophysical and cosmological observations point to the existence of an abundant form of matter interacting almost exclusively through gravity. A leading dark matter candidate is a weakly interacting massive particle, or WIMP, a thermal relic of the Big Bang, which has a sub-electroweak-scale self-annihilation cross-section and a mass in the TeV/c^2-range. The motion of galactic halo WIMPs relative to a detector on Earth could result in WIMP-nucleus elastic collisions detectable by a low-background, low-energy-threshold detector capable of unambiguously identifying a small number of nuclear recoils from WIMP collisions over the course of a very large exposure. Thanks to its excellent ionization response and unique scintillation light emission characteristics, liquid argon can provide excellent sensitivity for WIMP nuclear collisions and strong background suppression. Building upon its vast experience with liquid argon detectors, the DarkSide Collaboration, now Global Argon Dark Matter Collaboration, is building a new generation experiment featuring 50 tonnes of liquid argon as the target for DM interactions hosted in a dual-phase time projection chamber. This experiment, DarkSide-20k, extends the cross-section vs. mass range sensitivity in the search for dark matter to 4.6x10^-48 cm^2 for a 90% C.L. exclusion and 1.5x10^-47 cm^2 at a 5 sigma discovery significance for a 1 TeV/c^2 WIMP after a 10 yr run, well beyond any current or presently funded experiment. Several essential elements allow DS-20k to achieve this goal. These are low argon target activity; use of the scintillation light signal for energy measurement and pulse shape discrimination (PSD) against backgrounds; event position reconstruction using the ionization signal; an active neutron veto surrounding the LAr TPC; and excellent shielding from background radiation by an active muon veto. These techniques are implemented by a combination of new and proven technologies, including low radioactivity argon from underground sources, SiPM-based cryogenic photosensors, and a ProtoDUNE-like cryostat filled with atmospheric argon (AAr), and a LAr TPC constructed from low background acrylic. In addition, thanks to its large active mass and intrinsic radio purity, DS-20k will be able to pursue a rich scientific program, spanning from the observation of supernovae in the Milky Way and the solution of the neutrino mass hierarchy problem to the exploration of more exotic dark matter models.
Speaker: Francesco Di Capua -
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Latest results from the CUORE experiment
The Cryogenic Underground Observatory for Rare Events (CUORE) is the first bolometric experiment searching for 0νββ decay that has been able to reach the one-tonne mass scale. The detector, located at the LNGS in Italy, consists of an array of 988 TeO2 crystals arranged in a compact cylindrical structure of 19 towers. CUORE began its first physics data run in 2017 at a base temperature of about 10 mK and in April 2021 released its 3rd result of the search for 0νββ, corresponding to a tonne-year of TeO2 exposure. This is the largest amount of data ever acquired with a solid state detector and the most sensitive measurement of 0νββ decay in 130Te ever conducted, with a median exclusion sensitivity of 2.8×10^25 yr. We find no evidence of 0νββ decay and set a lower bound of 2.2 ×10^25 yr at a 90% credibility interval on the 130Te half-life for this process. In this talk, we present the current status of CUORE search for 0νββ with the updated statistics of one tonne-yr. We finally give an update of the CUORE background model and the measurement of the 130Te 2νββ decay half-life, study performed using an exposure of 300.7 kg⋅yr.
Speaker: Guido Fantini -
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The KDK Experiment: A Measurement of 40K for Rare-Event Searches and Geochronology
Potassium-40 ($^{40}$K) is a naturally-occurring, radioactive isotope impacting understanding of nuclear structure, geological ages spanning timescales as old as the Earth, and rare-event searches including those for dark matter and neutrinoless double beta decay. In many advancing fields, the accelerating precision required for new discoveries has been limited by knowledge of the $^{40}$K decay scheme. This long-lived radionuclide undergoes electron capture decays to either the excited or ground state of its Ar daughter, of which the latter has previously not been measured, and estimates of its branching ratio are highly variable ($(0-0.8)\%$). In many dark matter searches, $^{40}$K contamination produces a challenging 3 keV background from these electron capture decays in the expected direct-detection signal region, and the ill-known ground state contribution may affect interpretation of dark matter results, such as that of DAMA/LIBRA. In geochronology, the common omission of this decay branch may affect calculated ages. This rare third-forbidden unique decay additionally provides an estimate for the associated weak axial vector coupling constant, the quenching of which affects calculated half-lives of neutrinoless double-beta decay. The KDK (``potassium decay") experiment is carrying out the first measurement of this elusive $^{40}$K branch using a coincidence technique between a high-resolution silicon drift detector to observe X-rays, and a high-efficiency ($\sim 98\%$) Modular Total Absorption Spectrometer (Oak Ridge National Labs) to tag gammas, to differentiate ground and excited state electron capture decays of $^{40}$K. We report on the $^{40}$K analysis, and the extent of its applications.
Speaker: Lilianna Hariasz (Queen's University, Kingston, ON, Canada) -
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Discovering Neutrinoless Double-Beta Decay in Ge-76 with the LEGEND Experiment
The search for neutrinoless double beta (0$\nu\beta\beta$) decay is considered as the most promising way to prove the Majorana nature of neutrinos as well as to give indication on the mass hierarchy and on the absolute mass scale. The discovery of 0$\nu\beta\beta$ decay would moreover open the way for theories predicting the observed matter anti-matter asymmetry of the Universe being a consequence of lepton number violation through leptogenesis.
Building upon the success of GERDA and MAJORANA experiments, the LEGEND (Large Enriched Germanium Detector for Neutrinoless bb Decay) Collaboration aims at building a $^{76}$Ge-based 0$\nu\beta\beta$ experiment with a sensitivity on the half-life beyond $10^{28}$ years, to fully span the inverted neutrino mass ordering region. The LEGEND project will proceed in two steps: in the first phase, 200 kg of enriched germanium detectors will be deployed in the existing GERDA facility at LNGS. With an exposure of 1 t$\cdot$yr and a BI of 0.5 cts/(FWHM$\cdot$t$\cdot$yr), LEGEND-200 will be able to reach a sensitivity of about $10^{27}$ yr at 90% C.L. In the second phase, the enriched germanium mass will be increased up to 1000 kg. With a background index of 0.025 cts/(FWHM$\cdot$t$\cdot$yr) and with an exposure of 10 t$\cdot$yr, LEGEND-1000 will be able to reach a 3$\sigma$ half-life discovery sensitivity of 1.3$\times 10^{28}$ yr.
In this talk an overview of the LEGEND project will be presented together with the status of LEGEND-200, currently in the commissioning phase at LNGS.
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High Energy Particle Physics Room 3
Room 3
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Deciphering Initial states of high energy heavy-ion collisions using spectatorsSpeaker: Dr Vipul Bairathi (Instituto de Alta Investigación, Universidad de Tarapacá)
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19
Recent spin results from PHENIX
Spin structures are important properties of nucleons. At the Relativistic Heavy Ion Collider (RHIC), the PHENIX experiment probed longitudinal spin structures by colliding two longitudinally polarized protons ($\vec{p}+\vec{p}$) and measuring its spin asymmetry ($A_{LL}$) of a variety of final states. Colliding a transversely polarized proton with a nucleon/ion ($\vec{p}+p/A$) provides similar access to the transverse single spin asymmetry ($A_N$). Direct photon, hadron, and jet production are the common channels used in measurements. Compared with hadron and jet production, direct photon production has little fragmentation contributions and is taken as the ``golden'' channel. On the other hand, hadron and jet production has larger statistics. Another channel is the forward neutron production, which is sensitive to the Regge behavior and the electromagnetic interactions. In this talk, I will highlight the recent PHENIX $A_{LL}$ and $A_N$ measurements from the direct photon, hadron, jet, and forward neutron production.
Speaker: Dr Zhongling Ji (UCLA)
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18
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Workshop on Heavy Ion Physics Room 1
Room 1
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20
Study of nuclear fragmentation and development of a method for centrality determination in heavy ion collisions at energies of 1-2 AGeV
TBA
Speaker: Elisaveta Zherebtsova
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20
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Workshop on Lattice Field Theory and Condensed Matter Physics Room 4
Room 4
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21
Chiral Magnetic Effect in Keldysh technique
We consider relativistic fermionic systems in lattice regularization out of equilibrium. The chiral magnetic conductivity is calculated in spatially infinite system using Keldysh technique of quantum kinetic theory.
Speaker: Михаил Зубков -
22
Quantum chaos in supersymmetric quantum mechanics
We use exact diagonalization to study energy level statistics and out-of-time-order correlators (OTOCs) for the simplest supersymmetric extension $\hat{H}_S = \hat{H}_B \otimes I + \hat{x}_1 \otimes \sigma_1 + \hat{x}_2 \otimes \sigma_3$ of the bosonic Hamiltonian $\hat{H}_B = \hat{p}_1^2 + \hat{p}_2^2 + \hat{x}_1^2 \, \hat{x}_2^2$. For a long time, this bosonic Hamiltonian was considered one of the simplest systems which exhibit dynamical chaos both classically and quantum-mechanically. Its structure closely resembles that of spatially compactified pure Yang-Mills theory. Correspondingly, the structure of our supersymmetric Hamiltonian is similar to that of spatially compactified supersymmetric Yang-Mills theory, also known as the Banks-Fischler-Shenker-Susskind (BFSS) model. We present numerical evidence that a continuous energy spectrum of the supersymmetric model leads to monotonous growth of OTOCs down to the lowest temperatures, a property that is also expected for the BFSS model from holographic duality. We find that this growth is saturated by low-energy eigenstates with effectively one-dimensional wave functions and a completely non-chaotic energy level distribution. We observe a sharp boundary separating these low-energy states from the bulk of chaotic high-energy states. Our data suggests, although with a limited confidence, that the OTOC growth might be exponential over a finite range of time, with the corresponding Lyapunov exponent scaling linearly with temperature. In contrast, the gapped low-energy spectrum of the bosonic Hamiltonian leads to oscillating OTOCs at low temperatures without any signatures of exponential growth. We also find that the OTOCs for the bosonic Hamiltonian are never sufficiently close to the classical Lyapunov distance. On the other hand, the OTOCs for the supersymmetric system agree with the classical limit reasonably well over a finite range of temperatures and evolution times.
Speaker: Pavel Buividovich
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21
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Heavy Ion Collisions and Critical Phenomena Room 1
Room 1
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Jet-like correlations with $V^{0}$ triggers in pp and Pb--Pb collisions with ALICE at the LHC
The measurement of azimuthal correlations between two particles is a powerful tool to investigate the properties of strongly-interacting nuclear matter created in ultra-relativistic heavy-ion collisions. In particular, studying the near-and away-side hadron yields associated with trigger particles can provide important information to understand both the jet-medium interaction and hadron production mechanism. In this contribution, we present a study of two-particle correlations; $\mathrm{V^{0}}$($\mathrm{K^{0}_{S}}$, $\Lambda/\overline{\Lambda}$) and charged hadrons as trigger particles with a transverse momentum of $8 < p_\mathrm{T,trig} < 16$ $\mathrm {GeV}/c$ and associated charged particles of $1$ $\mathrm{GeV}/c< p_\mathrm{T,assoc} < p_\mathrm{T,trig}$ at mid-rapidity in pp and Pb--Pb collisions at $\sqrt{s_{\rm{NN}}}$ $=5.02$ TeV recorded with the ALICE detector.
After subtracting the contributions from the flow background, the per-trigger yields are calculated on the near and away-side. The ratio of the per-trigger yields in Pb--Pb collisions with respect to pp collisions, $I_{\mathrm{AA}}$, is measured in the most central (0--10%) collisions. A significant enhancement of $I_{\mathrm{AA}}$ for various particle species is observed at the lowest $p_\mathrm{T,assoc}$ on both the near- and away-side, while a strong suppression of $I_{\mathrm{AA}}$ for $p_\mathrm{T,assoc}$ $>3$ $\mathrm{GeV}/c$ on away-side is observed as expected from strong in-medium energy loss. The data are compared to AMPT, HIJING and EPOS models. All calculations, except HIJING, qualitatively describe the near- and away-side yield modifications at
intermediate and high $p_\mathrm{T,assoc}$.Speaker: Mustafa Anaam (Central China Normal University CCNU (CN)) -
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Reconstructed Jets and Jet Substructure in 200 GeV p+p/d+Au Collisions with PHENIX
Measurements of reconstructed jets and jet substructure offer opportunities to study fragmentation in a nuclear environment. However, at RHIC this promise is complicated by the low jet energies and lack of hadronic calorimetry in the current experiments. In this poster, we report new results with reconstructed jets, including substructure measurements applying jet grooming techniques, in p+p collisions at a center of mass energy of 200 GeV using the PHENIX experiment. The measurements are unfolded for detector response using a multi-dimensional algorithm to extract both the cross section and jet substructure quantities in a self-consistent fashion. These measurements have implications for developing a quantitative understanding the modification of jets in heavier systems, such as p+Au, Cu+Au collisions at RHIC.
Speaker: John Lajoie
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23
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Workshop on Astro-Cosmo-Gravity Room 4
Room 4
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25
A nontrivial footprint of standard cosmology in the future observations of low-frequency gravitational waves
Recent research shows that the cosmological components of the Universe should influence
on the propagation of GravitationalWaves (GWs) and even it has been proposed
a new way to measure the cosmological constant using Pulsar Timing Arrays (PTAs).
However, these results have considered very particular cases (e.g. a de Sitter Universe
or a mixing with non-relativistic matter). In this work we propose an extension of
these results, using the Hubble constant as the natural parameter that includes all the
cosmological information and studying its effect on the propagation of GWs. Using
linearized gravity we considered a mixture of perfect fluids permeating the spacetime
and studied the propagation of GWs within the context of the CDM model.
We found from numerical simulations that the timing residual of local pulsars should
present a distinguishable peak depending on the local value of the Hubble constant.
As a consequence, when assuming the standardCDM model, our result predicts that
the region of maximum timing residual is determined by the redshift of the source.
This framework represents an alternative test for the standard cosmological model,
and it can be used to facilitate the measurements of gravitational waves by ongoing
PTAs projects.Speaker: JORGE ALFARO (Pontificia Universidad Católica de Chile) -
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Thermodynamics of graviton condensate
In this work, we present the thermodynamic
study of amodel that considers the black hole as a condensate
of gravitons. In this model, the spacetime is not asymptotically
flat because of a topological defect that introduces an
angle deficit in the spacetime like in Global Monopole solutions.
We have obtained a correction to the Hawking temperature
plus a negative pressure associated with the black
hole of mass M. In this way, the graviton condensate, which
is assumed to be at the critical point defined by the condition
μch = 0, has well-defined thermodynamic quantities
P, V, Th, S, and U as any other Bose–Einstein condensate
(BEC). In addition, we present a formal equivalence between
the Letelier spacetime and the line element that describes
the graviton condensate. We also discuss the Kiselev black
hole, which can parametrize the most well-known spherically
symmetric black holes. Finally, we present a new metric,
which we will call the BEC–Kiselev solution, that allows
us to extend the graviton condensate to the case of solutions
with different matter contents.Speaker: JORGE ALFARO (Pontificia Universidad Católica de Chile)
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19:00
Introduction to the History of OAC Chapel and Meaning of Blessing by Katerina Karkala (OAC), followed by a ceremony of Blessing. OAC Chapel
OAC Chapel
Introduction to the History of OAC Chapel and Meaning of Blessing by Katerina Karkala (OAC), followed by a ceremony of Blessing, for interested people.
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20:00
Dinner
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Cosmology, Astrophysics, Gravity, Mathematical Physics Room 1
Room 1
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27
Quantum gravity on finite spacetimes and dynamical mass
We review quantum gravity model building using the new formalism of ‘quantum Riemannian geometry’ to construct this on finite discrete spaces and on fuzzy ones such as matrix algebras. The formalism starts with a ‘differential structure’ as a bimodule Ω^1 of differential 1-forms over the coordinate algebra 𝐴, which could be noncommutative. A quantum metric is a noncommutative rank (0,2) tensor in Ω^1⊗_𝐴Ω^1 , for which we then search for a quantum Levi-Civita connection (this is no longer unique or guaranteed). We outline the three models which have so far been constructed in this formalism, commonalities among them, and issues going forward. One commonality is a uniform nonzero variance of metric expectation values in the strong gravity limit. We also outline and discuss the construction of quantum FLRW cosmology and black-hole backgrounds using quantum Riemannian geometry. Among new results, we perform a Kaluza-Klein type analysis where we tensor classical spacetime coordinates with a finite quantum Riemannian geometry and we give an example where a scalar field on the total space appears as a multiplet of scalar fields on spacetime with a spread of dynamically generated masses.
Speaker: Shahn majid
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27
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High Energy Particle Physics Room 1
Room 1
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28
Cross sections, couplings, and properties of the Higgs boson - 10th anniversary of the discovery (CMS)
Cross sections, couplings, and properties of the Higgs boson - 10th anniversary of the discovery (CMS)
Speaker: Linda Finco (University of Nebraska Lincoln (US)) -
29
Celebrating 10 years of Higgs boson physics at ATLAS
A review of the discovery of the Higgs boson and subsequent measurements of its properties will be presented.
Speaker: Brian Moser (CERN)
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28
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10:30
Coffee break
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High Energy Particle Physics Room 1
Room 1
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30
Recent searches for new phenomena with the ATLAS detector
Many theories beyond the Standard Model (BSM) have been proposed to address several of the Standard Model's shortcomings, such as the origin of dark matter and neutrino masses, the fine-tuning of the Higgs Boson mass, or the observed pattern of masses and mixing angles in the quark and lepton sectors. Many of these BSM extensions predict new particles or interactions directly accessible at the LHC. This talk will present some highlights on recent searches based on the the full Run 2 data collected by the ATLAS detector at the LHC with a centre-of-mass energy of 13 TeV. These include searches for leptoquarks and vector-like fermions, new high mass resonances and lepton flavour violating decays, dark matter searches in final states with large missing transverse momentum, as well as dark-sector searches using unconventional and long-lived particle signatures.
Speaker: Dr Eirik Gramstad (University of Oslo (NO)) -
31
Top (CMS)
Top quark physics with the CMS detector
Speaker: Javier Fernandez Menendez (Universidad de Oviedo (ES)) -
32
Top quark physics with the ATLAS experiment at the LHC
The large top quark samples in top quark pair and single top production have yielded measurements of the production cross section of unprecedented precision and in new kinematic regimes. They have also enabled new measurements of top quark properties that were previously inaccessible, enabled the observation of many rare top quark production processes predicted by the Standard Model and boosted searches for flavour- changing-neutral-current interactions of the top quark, that are heavily suppressed in the SM. In this contribution the highlights of the ATLAS top quark physics program are presented. ATLAS presents in particular new measurements of the production cross section and production asymmetry of highly boosted top quark pairs and of the top quark polarization in t-channel single top production. The recent observation of associated production of a single top quark with a photon completes the list of processes and adds sensitivity to the EW couplings of the top quark. ATLAS furthermore reports strong evidence for the four-top-production process. Strict bounds are also presented of searches for flavour-changing-neutral-current processes involving top quarks.
Speaker: Peter Berta (Charles University, Prague (CZ)) -
33
Exotica and Beyond 2 Generations at the CMS Experiment
We will present the latest results for searches of particles and
interactions beyond those of the standard model performed with the
proton-proton collision dataset acquired with the CMS detector. Results
include the full Run 2 dataset and the expectations for Run 3 will also be
discussed.Speaker: Oscar Gonzalez Lopez (CIEMAT - Centro de Investigaciones Energéticas Medioambientales y Tec. (ES)) -
34
Higgs Physics at ILC
With technically mature design and well understood physics program, ILC is realistic option for realization of a Higgs factory. With a unique physics reach of a linear collider, ILC meaningfully complement projections for HL-LHC. Energy staged data collection, employment of beam polarization and capability to reach a TeV center-of-mass energy enable unique precision to probe BSM models above the discovery limit as well as to measure the Higgs self-coupling. These and other highlights from the Higgs physics program will be discussed.
Speaker: Ivanka Bozovic-Jelisavcic (University of Belgrade (RS)) -
35
Short-Baseline neutrino oscillation searches with the ICARUS detector
The ICARUS collaboration employed the 760-ton T600 detector in a successful three-year physics run at the underground LNGS laboratories studying neutrino oscillations with the CNGS neutrino beam from CERN, and searching for atmospheric neutrino interactions. ICARUS performed a sensitive search for LSND-like anomalous νe appearance in the CNGS beam, which contributed to the constraints on the allowed parameters to a narrow region around 1 eV^2, where all the experimental results can be coherently accommodated at 90% C.L. After a significant overhaul at CERN, the T600 detector has been installed at Fermilab. In 2020 cryogenic commissioning began with detector cool down, liquid Argon filling and recirculation. ICARUS has started operations and is presently in its commissioning phase, collecting the first neutrino events from the Booster Neutrino Beam and the NuMI off-axis. The main goal of the first year of ICARUS data taking will then be the definitive verification of the recent claim by NEUTRINO-4 short baseline reactor experiment both in the 𝜈μ channel with the BNB and in the 𝜈e with NuMI. After the first year of operations, ICARUS will commence its search for evidence of a sterile neutrino jointly with the SBND near detector, within the Short Baseline Neutrino (SBN) program. The ICARUS exposure to the NuMI beam will also give the possibility for other physics studies such as light dark matter searches and neutrino-Argon cross section measurements. The proposed contribution will address ICARUS achievements, its status and plans for the new run at Fermilab and the ongoing developments of the analysis tools needed to fulfill its physics program.
Speaker: Christian Farnese (Universita e INFN, Padova (IT))
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30
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13:00
Lunch
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15:00
Coffee break
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High Energy Particle Physics Room 2
Room 2
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36
Photon-photon fusion and tau g-2 measurement
Relativistic heavy-ion beams at the LHC are accompanied by a large flux of equivalent photons, leading to multiple photon-induced processes. This talk presents a series of measurements of such processes performed by the ATLAS Collaboration. New measurements of exclusive dilepton production (electron, muon, and tau pairs) are discussed. Furthermore, the tau-pair production measurements can constrain the tau lepton's anomalous magnetic dipole moment. High statistics measurements of light-by-light scattering shown in this talk provide a precise and unique opportunity to investigate extensions of the Standard Model, such as the presence of axion-like particles. Presented measurements of muon pairs produced via two-photon scattering processes in hadronic Pb+Pb collisions provide a novel test of strong-field QED by exploiting correlations between the lepton pair and second-order event-plane, which can potentially be a sensitive electromagnetic probe of the quark-gluon plasma. Results are compared with recent theory calculations.
Speaker: Haifeng Li (Shandong University (CN)) -
37
Dark Matter searched in CMS
The CMS collaboration performed searches for Dark Matter (DM) particles directly produced in pairs in proton-proton collisions. Investigated signatures include a single energetic object and a significant transverse momentum imbalance, strongly coupled DM production or decays in so-called hidden sectors. The Run 2 LHC at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity up to 138/fb were used to set exclusion limits on the cross sections of DM production and interaction cross sections, as a function of the DM particle mass.
Speaker: Malgorzata Kazana (NCBJ Warsaw (PL)) -
38
A new Scattering and Neutrino Detector at the LHC (SND@LHC)
SND@LHC is a compact and stand-alone experiment to perform measurements with neutrinos produced at the LHC in a hitherto unexplored pseudo-rapidity region of 7.2 < 𝜂 < 8.6, complementary to all the other experiments at the LHC. The experiment is to be located 480 m downstream of IP1 in the unused TI18 tunnel. The detector is composed of a hybrid system based on an 800 kg target mass of tungsten plates, interleaved with emulsion and electronic trackers, followed downstream by a calorimeter and a muon system. The configuration allows efficiently distinguishing between all three neutrino flavours, opening a unique opportunity to probe physics of heavy flavour production at the LHC in the region that is not accessible to ATLAS, CMS and LHCb. This region is of particular interest also for future circular colliders and for predictions of very high-energy atmospheric neutrinos. The detector concept is also well suited to searching for Feebly Interacting Particles via signatures of scattering in the detector target. The first phase aims at operating the detector throughout LHC Run 3 to collect a total of 250 fb−1. The experiment was recently installed in the TI18 tunnel at CERN and has seen its first data. A new era of collider neutrino physics is just starting.
Speaker: Elena Graverini (EPFL - Ecole Polytechnique Federale Lausanne (CH)) -
39
Directionality for nuclear recoils in a liquid argon Time Projection Chamber
The Recoil Directionality project (ReD) within the Global Argon Dark Matter Collaboration aims to characterize the light and charge response of a liquid argon (LAr) dual-phase Time Projection Chamber (TPC) to neutron-induced nuclear recoils. The main goal of the project is to probe for the possible directional dependence suggested by the SCENE experiment. Furthermore, ReD is also designed to study the response of a LAr TPC to very low-energy nuclear recoils. Sensitivity to directionality and to low-energy recoils are both key assets for future argon-based experiments looking for Dark Matter in the form of WIMPs. Furthermore, the ReD TPC uses all the innovative features of the design of the DarkSide-20k experiment: in particular the optoelectronic readout based on SiPM and the cryogenic electronics. It is thus a valuable test bench of the technology which is being developed for DarkSide-20k and for the future project Argo.
The first measurement of ReD consisted in the irradiation of a miniaturized LAr TPC with a neutron beam at the INFN, Laboratori Nazionali del Sud (LNS), Catania. The correlation of the ionisation and scintillation signals, which is a possible handle to measure the recoil direction of nuclei, was studied in detail for 70 keV nuclear recoils, using a neutron beam produced via the reaction p(7Li,7Be)n from a primary 7Li beam delivered by the TANDEM accelerator of LNS. A model based on directional modulation in charge recombination was developed to describe the correlation.
In addition, a dedicated measurement tailored to characterize the response of the TPC to very low-energy nuclear recoils (< 10 keV) is being currently performed at INFN Sezione di Catania, using neutrons produced by an intense Cf252 fission source.
In this contribution, we describe the experimental setup, the theoretical model, and the preliminary results from the data analysis.
Speaker: Paul Zakhary (AstroCeNT, CAMK, PAN)
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36
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High Energy Particle Physics Room 3
Room 3
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40
Calculation of rescaling factors and nuclear multiplication of muons in extensive air showers
Recent results obtained from leading cosmic ray experiments indicate that simulations using LHC-tuned hadronic interaction models underestimate the number of muons in extensive air showers compared to expectations based on hadronic models. This is the so-called muon deficit problem. Determination of the muon component in the air shower is crucial for inferring the mass of the primary particle, which is a key ingredient in the efforts to pinpoint the sources of ultra-high energy comic rays.
In this paper, we present a new method to derive the muon signal in detectors, which uses the difference between the total reconstructed (“data”) and simulated signals, which is connected to the muon signal and is roughly independent of the zenith angle, but depends on the mass of the primary cosmic ray. Such a method offers an opportunity not only to test/calibrate the hadronic interaction models, but also to derive the β exponent, which describes an increase of the number of muons in a shower as a function of the energy and mass of the primary cosmic ray. Detailed simulations show a dependence of the β exponent on hadronic interaction properties, thus the determination of this parameter is important for understanding the muon deficit problem.
We validate the method by using Monte Carlo simulations for EPOS-LHC and QGSJetII-04 hadronic interaction models, showing that this method allows us to recover the ratio of the muon signal between EPOS-LHC and QGSJetII-04 and the average β exponent for the studied system, within less than a few percent. This is a consequence of the good recovery of the muon signal for each primary included in the analysis.Speaker: Dariusz Gora (Institute of Nuclear Physics PAN)
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40
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High Energy Particle Physics Room 1
Room 1
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41
Investigation of rare nuclear decays of naturally occurring osmium isotopes accompanied by $\gamma$ quanta.
A search for rare nuclear decays of the naturally occurring osmium isotopes accompanied by $\gamma$ quanta has been performed using an ultra-low-background germanium $\gamma$ detectors and an ultrapure osmium sample at the Gran Sasso National Laboratory of the INFN (Italy).
The final results on the 2$\beta$ and $\alpha$ decays of osmium isotopes obtained in three experimental stages will be presented in this talk.
During the data taking with the $\gamma$ detector, no effect has been detected, and lower limits of the half-life of the naturally occurring osmium isotopes relative to $\alpha$ and $2\beta$ decays of $^{184}$Os and $^{192}$Os were set at the level of $10^{15}–10^{20}$ yr.
In the case of $\alpha$ decays of $^{184}$Os and $^{186}$Os to the first excited levels of daughter nuclei, the limits substantially exceed the present theoretical estimates of the decays probabilities. New experimental perspectives to detect the $\alpha$ decays of $^{184}$Os and $^{186}$Os and improve the experimental sensitivity to the $2\beta$ processes in $^{184}$Os and $^{192}$Os will be discussed.Speaker: Vincenzo Caracciolo
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41
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Mini-workshop on Machine Learning for Particle Physics Room 4
Room 4
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42
Intro to Machine LearingSpeaker: Tommaso Dorigo (Universita e INFN, Padova (IT))
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43
Machine Learning hands-on workshopSpeaker: Dr Pietro Vischia (Universite Catholique de Louvain (UCL) (BE))
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42
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Cosmology, Astrophysics, Gravity, Mathematical Physics Room 1
Room 1
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44
AEgIS Phase 2: upgrades and first data
AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) is an experiment at the Antiproton Decelerator (AD) facility at CERN that aims at investigating the asymmetry between matter and antimatter and, especially, the antihydrogen behaviour under Earth’s gravitational pull. In 2018, the first antihydrogen atoms were formed by charge exchange between Rydberg positronium and trapped antiprotons, which resulted in a substantial gain of knowledge of the involved processes. The experiment has received multiple upgrades in the last two years, during CERN Long Shutdown 2, to substantially improve the antihydrogen formation rate, and to accommodate the fact that, in the meantime, a new decelerator, the Extra Low ENergy Antiproton (ELENA), has been incorporated to AD. The upgrades included a new laser clean-room hosting two new lasers, improved efficiency and stability of the positron accumulation line, a new scheme of the antihydrogen formation trap electrodes, new degraders for the incoming antiprotons, detectors with higher sensitivity, and an entirely new control system has been conceived and deployed. All these efforts have been put in place in order to generate the first pulsed beam of neutral antihydrogen, which will enable high precision inertial studies of antimatter. In this presentation, I will describe the upgrades, the validation of the new working modality with the ELENA incoming beams, and I will provide an outlook on further developments.
Speaker: Marco Volponi (Universita degli Studi di Trento and INFN (IT))
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44
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Cosmology, Astrophysics, Gravity, Mathematical Physics Room 3
Room 3
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45
Multi-messenger studies with the Pierre Auger Observatory
The combination of experimental data from Observatories studying ultra-high energy cosmic rays, photons, neutrinos and gravitational waves, has provided in the last decade many insights on the most extreme phenomena in the Universe. This multi-messenger approach is shedding light on the physics beyond production and propagation of these messengers by exploring their intimate connection.
The Pierre Auger Observatory, the world's largest ultra-high energy cosmic ray observatory, has a high potential for multi-messenger studies thanks to its sensitivity to photons and neutrinos above 10$^{17}$ eV. Several activities in this context are being carried out at the Observatory. We report here the latest results and perspectives from diffuse and targeted searches along with those from follow-up analyses.Speaker: Dr Viviana Scherini (Università del Salento and INFN Lecce, Italy) -
46
First Results of XENONnT
XENONnT is a dark matter direct detection experiment employing a dual-phase time projection chamber, with 5.9 tonnes of liquid xenon and extremely low radioactivity. It's a multi-purpose particle astrophysics detector, mainly searching for dark matter, axion, and neutrinos. Since 2021, XENONnT has been taking science data and has reached the unprecedentedly low background in the keV region of interest, resulting in one order of magnitude improvement of WIMPs sensitivity compared to its predecessor XENON1T. In this talk, we'll introduce the new results based on the first science data.
Speaker: Kexin Liu (Tsinghua University)
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45
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High Energy Particle Physics Room 3
Room 3
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47
High precision neutrino cross section measurements with the ENUBET monitored neutrino beam
The main source of systematic uncertainty on neutrino cross section measurements at the GeV scale is represented by the poor knowledge of the initial flux. The goal of cutting down this uncertainty to 1% can be achieved through the monitoring of charged leptons produced in association with neutrinos, by properly instrumenting the decay region of a conventional narrow-band neutrino beam. Large angle muons and positrons from kaons are measured by a sampling calorimeter on the decay tunnel walls (tagger), while muon stations after the hadron dump can be used to monitor the neutrino component from pion decays. This instrumentation can provide a full control on both the muon and electron neutrino fluxes at all energies. Furthermore, the narrow momentum width (<10%) of the beam provides a $\mathcal{O}$(10%) measurement of the neutrino energy on an event by event basis, thanks to its correlation with the radial position of the interaction at the neutrino detector. The ENUBET project has been funded by the ERC in 2016 to prove the feasibility of such a monitored neutrino beam and is cast in the framework of the CERN neutrino platform (NP06) and the Physics Beyond Colliders initiative. The ERC project has entered its last year and the efforts are now devoted to the final tuning of the beamline shielding elements. These studies are being pursued exploiting a powerful genetic algorithm that scans automatically the parameter space of the focusing beamline in order to find a configuration minimizing halo particles in the tagger while preserving a large meson yield. Realistic particle identification algorithms have been setup to reconstruct muons and positrons in the decay tunnel with high signal to noise ratio on an event by event basis. A full Geant4 simulation of the facility is employed to assess the final systematics budget on the neutrino fluxes with an extended likelihood fit of a model where the hadro-production, beamline geometry and detector-related uncertainties are parametrized by nuisance parameters. In parallel the collaboration is building a section of the decay tunnel instrumentation ("demonstrator", 1.65m in length, 7 ton mass) that will be exposed to the T9 particle beam at CERN-PS in autumn 2022, for a final validation of the detector performance and as a proof of the effectiveness of the technique. In 2019-2022 ENUBET has devised the first end-to-end simulation of the facility and demonstrated that the precision goals can be achieved in about three years of data taking employing neutrino detectors of moderate mass (ICARUS at FNAL, ProtoDUNE at CERN). The technology of a monitored neutrino beam has been proven to be feasible and cost-effective, and the complexity does not exceed significantly the one of a conventional short-baseline beam. The ENUBET results will play an important role in the systematic reduction programme of future long baseline experiments, thus enhancing the physics reach of DUNE and HyperKamiokande. In our contribution, we summarize the ENUBET design, physics performance and opportunities for its implementation in a timescale comparable with next long baseline neutrino experiments.
Speaker: Valerio Mascagna (Universita di Brescia (IT))
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47
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18:00
Guided Visit to the Museum of Monastery Gonia (TBC)
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19:30
Interdisciplinary Public Talk in English by Antonis Kalogerakis (OAC) "Climate Crisis of the Planet and Good Environmental Practices for a Sustainable Future”
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20:00
Dinner
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High Energy Particle Physics Room 1
Room 1
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48
DAMA/LIBRA results and perspectives
The DAMA/LIBRA–phase2 experiment at Gran Sasso and its results will be presented. The improved experimental configuration with respect to the phase1 allowed a lower software energy threshold. The DAMA/LIBRA–phase2 data confirm a signal that meets all the requirements of the model independent Dark Matter annual modulation signature, at high C.L. The model independent DM annual modulation result is compatible with a wide set of DM candidates. A new configuration of DAMA/LIBRA–phase2 is now running with a further lowered energy threshold. The perspectives will be outlined.
Speaker: Pierluigi Belli
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48
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Heavy Ion Collisions and Critical Phenomena Room 1
Room 1
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49
Exploring fundamental properties of dense nuclear matter in the laboratory
When the first high-energy heavy-ion beams became available about 40 years ago, experiments started to investigate the nuclear matter equation-of-state (EOS) at densities above saturation density. Since then, laboratory experiments with heavy-ions at GSI and AGS provided constraints on the high-density EOS, which are complemented by recent astrophysical observations. Further detailed information on the EOS is expected from future high-precision experiments at beam energies, where densities like in the core of neutron stars are transiently produced in the reaction volume. These laboratory measurements are also sensitive to the elementary degrees-of-freedom of strongly-interacting matter, which are expected to appear at high densities. Recent QCD-based calculations predict the emergence of a possible critical endpoint of a first-order chiral phase-transition from hadronic to quark-gluon matter at temperatures and baryon chemical potentials, which are covered by heavy-ion collisions at the future Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany. The present status and the future perspectives of laboratory experiments exploring the fundamental properties of dense QCD matter will be discussed.
Speaker: Peter Senger
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49
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Cosmology, Astrophysics, Gravity, Mathematical Physics Room 1
Room 1
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50
The CNO measurement and its role in the stars and the Sun physics
I will describe the measurement of the CNO component of the Solar Neutrino spectra by the BOREXINO experiment at the Laboratori Nazionali del Gran Sasso in Italy. This, analysis, together with previous measurements of Solar Neutrino spectra, conclusively demonstrates the mechanism of energy generation in the Sun (and in Main Sequence Stars). The implication of the measurement on the details of the current model of the Sun (and its metallicity) will also be discussed.
Speaker: Marco Giammarchi (Università degli Studi e INFN Milano (IT))
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50
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10:30
Coffee break
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High Energy Particle Physics Room 1
Room 1
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51
The ATLAS Experiment upgrade program
After 9 years of successful operation in proton-proton collisions at $\sqrt{s}$ = 13 TeV, the ATLAS detector started in 2018 the preparations for an ambitious physics project, aiming the exploration of very rare processes and extreme phase spaces, an endeavor that will require a substantial increase in the amount of data to be taken. To accomplish this purpose, a comprehensive upgrade of the detector and associated systems was devised and planned to be carried out in two phases. The Phase-I upgrade program foresees new features for the muon detector, for the electromagnetic calorimeter trigger system and for all trigger and data acquisition chain. These upgrades are reaching the final commissioning stage and will enable ATLAS to carry on its physics program at a two fold increased luminosity. Upon reaching an integrated luminosity of 350 fb $^{-1}$, the LHC will undergo a new upgrade, becoming the High-Luminosity LHC (Hl_LHC). The HL-LHC will reach an instantaneous ultimate luminosity of 7.5x10$^{34}$ cm$^{-1}$ of integrated luminosity in about 10 years of operation. The challenges the ATLAS experiment will face during the HL-LHC stage are paramount, as it will have to cope with more than 200 simultaneous collisions per bunch crossing with many subsystems exposed to very high radiation levels. To preserve its performance, the ATLAS detector will require a major upgrade program, known as Phase-II upgrade program. During the Phase-II upgrade, a completely new all-silicon tracker with extended rapidity coverage will replace the current inner tracker detector; the calorimeters and muon systems will have their trigger and data acquisition systems fully redesigned, allowing the implementation of a free-running readout system. Finally, a new subsystem called High Granularity Timing Detector will aid the track-vertex association in the forward region by incorporating timing information to the reconstructed tracks. This presentation will summarize the expected performance of the aforementioned projects as well as its impact on the physics program over the next years.
Speaker: Geoffrey Mullier (Lund University (SE)) -
52
CMS ECAL upgrade for precision timing and energy measurements at the High-Luminosity LHC
The High Luminosity upgrade of the LHC (HL-LHC) at CERN will provide unprecedented instantaneous luminosity of ~5 x 10^34cm −2s−1, leading to an average of 150-200 simultaneous collisions. This extreme instantaneous luminosity scenario represents a real challenge for the detectors. The barrel region of the CMS electromagnetic calorimeter (ECAL) will be preserved but operated at a lower temperature and with a completely new readout and trigger electronics. A dual gain trans-impedance amplifier and an ASIC providing two 160 MHz ADC channels, gain selection, and data compression will be installed. The trigger decision will be moved off-detector and performed by powerful and flexible FPGA processors, allowing for more sophisticated trigger algorithms to be applied. The upgraded ECAL will be capable of high-precision energy measurements and will greatly improve the time resolution for photons and electrons above 10 GeV. The design of the full ECAL barrel readout chain and the status of the component R&D will be presented, along with the latest test beam and laboratory test results for CATIA coupled with an ADC.
Speaker: Luigi Marchese (ETH Zurich (CH))
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51
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Mini-Workshop on Instruments and Methods in HEP Room 1
Room 1
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53
Heading to HL-LHC: the Muon Detector for the LHCb Upgrade II
The LHCb experiment, operating at the Large Hadron Collider (LHC) at CERN, is designed to perform precision measurements of CP violation as well as rare decays of beauty and charm hadrons, hunting for hints of Physics beyond the Standard Model.
The detector is a single-arm spectrometer covering a pseudo-rapidity range of 2 < η < 5. In runs 1 and 2, a total luminosity of about 9 fb-1 was integrated.
The LHCb Muon Detector plays a crucial role for tagging the flavour of b mesons through their semileptonic decays. While the detector commissioning for Run 3 is in progress, parallel studies are being carried out in order to define a new layout of the Muon Detector to comply with the challenging operating conditions foreseen at LHC Upgrade II. Instantaneous luminosities up to a factor ten higher than the design value are expected to produce particle rates ranging from several kHz/cm2 up to 1MHz/cm2 in the innermost regions. An intense R&D activity on new detector technologies is currently ongoing. The talk will give an overview on the present status of the Muon Detector project and its perspectives towards future upgrades.Speaker: Marilisa De Serio (Universita e INFN, Bari (IT))
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53
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Heavy Ion Collisions and Critical Phenomena Room 1
Room 1
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54
ALICE upgrades
To understand properties of strongly interacting matter especially in a heavy flavor sector or thermal radiation of plasma the ALICE experiment has significantly upgraded its detectors. In order to improve the pointing resolution and readout rates, a completely new silicon-pixel Inner Tracking System (ITS) was installed and extended to cover the acceptance of the forward muon detectors with a brand new Muon Forward Tracker (MFT), and the readout chambers of the Time Projection Chamber (TPC) were replaced with chambers using GEM foils to reduce ion backflow. In addition the Fast Interaction Trigger (FIT) has been modified and the Data Aquisition system has been redesigned.
After Run 3 the Forward Calorimeter (FOCAL) will be installed and further improvements of the inner most layers of the ITS are planned. The expected integrated luminosity collected by the ALICE detector during Run 3 and 4 will be 50 times more the recorded luminosity for minimum bias events from Run 1 and 2 and are $L^{\rm Pb-Pb}=13/$nb and $L^{\rm O-O}=0.5/$nb for lead and oxygen nuclei, respectively. For Run 5 and 6, a complete replacement of the ALICE detector with an all-silicon tracker with large rapidity coverage and a retractable inner tracking system that provides unique pointing resolution at mid-rapidity, complemented by modern particle-identification detectors is proposed.
The target luminosity for Run 5 and 6 is $L^{\rm Pb-Pb}=35/$nb for lead collisions. Perspectives for selected new results like photon initiated interactions in ultra-peripheral collisions, heavy flavor production or measurements at small Bjorken-$x$ will be presented.Speaker: Adam Matyja (Polish Academy of Sciences (PL))
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54
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High Energy Particle Physics Room 1
Room 1
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55
Upgrade of the CMS muon system
From 2018 to the beginning of 2022, the CMS experiment has performed the Long Shutdown 2 (LS2) upgrade campaign, aiming at adapting the detectors for the future conditions foreseen for High Luminosity Large Hadron Collider (HL-LHC) phase. This project has the main objective of increasing the instantaneous luminosity up to a factor of five beyond the design LHC instantaneous luminosity (5⋅10^34 cm^{-2}s^{-1}), enlarging the statistics available for the search of physics beyond the Standard Model.
In particular, CMS has started an upgrade campaign of its muon spectrometer. During LS2 the GE1/1 station, based on the Gas Electron Multiplier (GEM) technology has been installed in the endcap region, covering the pseudorapidity range 1.55 < |η| < 2.18. These detectors are characterized by a high radiation hardness and rate capability, and, because of this, the installation of other two GEM stations is foreseen in the future (GE2/1 and ME0), to improve the muon reconstruction in the endcaps and to extend the coverage of the muon system up to η ~ 2.8.
In this talk, the different upgrades performed on the muon subsystems, till the start of Run 3 data taking phase, and the future upgrades planned for HL-LHC will be presented, such as the installation of improved Resistive Plate Chambers (iRPC) in the CMS endcap region and the production of the future GEM stations. Moreover, the plans for already installed Drift Tubes (DT), Cathode Strip Chambers (CSC) and RPC subsystems, will be discussed. These focus on the frontend electronics, adapting it to sustain a particle rate ten times higher of the design value.Speaker: Simone Calzaferri (Università degli studi di Pavia - INFN Pavia)
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55
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Cosmology, Astrophysics, Gravity, Mathematical Physics Room 1
Room 1
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56
Towards Phase II of the Pierre Auger Observatory – AugerPrime
The Pierre Auger Observatory, located in the Southern hemisphere in the province of Mendoza, Argentina, is the world’s largest cosmic ray experiment. It implements complementary detection techniques to observe cosmic ray induced air showers at energies far beyond the limits reached at the most powerful particle accelerators. During Phase I, for almost two decades, the hybrid design of the Auger Observatory allowed studying the origins and properties of ultra-high-energy cosmic rays, providing unique results in astroparticle physics with unprecedented statistics. Nevertheless, there are still open questions that need to be answered. Consequently, Auger Phase II, called AugerPrime, is underway. The AugerPrime program includes the installation of plastic scintillators (SSD) and radio antennas atop each water-Cherenkov detector (WCD); new electronics to process signals from the WCD and the SSD with higher sampling frequency; an extension of the dynamic range of measurement through an additional small photomultiplier tube in the WCD; an array of underground scintillator detectors to measure the muonic component of extensive air showers. The main objective of AugerPrime is to provide an enhanced estimation of the mass composition of cosmic rays and increased statistics at the highest energies, helping us to elucidate the mystery of the most energetic particles in the Universe.
Speaker: Dr Paula Gina Isar (Institute of Space Science, Bucharest-Magurele, Romania)
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56
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13:00
Lunch
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15:30
Coffee break
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16:00
Excursion to Chania
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08:00
Free Day
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08:00
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08:00
Conference Excursion
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08:00
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High Energy Particle Physics Room 1
Room 1
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57
ATLAS highlights
Recent highlights from ATLAS, in all physics areas except heavy ions.
Speaker: Bill Murray (University of Warwick (GB)) -
58
CMS Highlights
This talk reviews the most important and recent results with the data collected by the CMS Collaboration.
Speaker: Javier Cuevas (Universidad de Oviedo (ES))
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57
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Heavy Ion Collisions and Critical Phenomena Room 1
Room 1
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59
ALICE Highlights
ALICE (A Large Ion Collider Experiment), one of the CERN Large Hadron Collider (LHC) experiments, was originally designed to study the physics of heavy-ion collisions. It was designed to detect, track, and identify particles in high-energy collisions up to the largest particle multiplicities. In its first decade of activity, ALICE Collaboration studied the hot and dense medium formed in heavy-ion collisions, the quark-gluon plasma, as well as the proton-proton and proton-lead collisions through many observables, both hard and soft.
In this overview, a selection of recent results obtained by the ALICE collaboration will be presented and discussed.
Speaker: Malgorzata Anna Janik (Warsaw University of Technology (PL))
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59
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10:30
Coffee break
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High Energy Particle Physics Room 1
Room 1
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60
LHCb highlight
Review of recent LHCb physics analysis result
Speaker: YH Yang (UCAS) -
61
Searches for dark matter with the ATLAS detector
The presence of a non-baryonic Dark Matter (DM) component in the Universe is inferred from the observation of its gravitational interaction. If Dark Matter interacts weakly with the Standard Model (SM) it could be produced at the LHC. The ATLAS experiment has developed a broad search program for DM candidates in final states with large missing transverse momentum produced in association with other SM particles (light and heavy quarks, photons, Z and H bosons, as well as additional heavy scalar particles) and searches where the Higgs boson provides a portal to Dark Matter, leading to invisible Higgs decays. The results of recent searches on 13 TeV pp data, their interplay and interpretation will be presented.
Speaker: Alex Zeng Wang (University of Wisconsin Madison (US))
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60
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Cosmology, Astrophysics, Gravity, Mathematical Physics Room 1
Room 1
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62
The link between the highest-energy cosmic rays and particle physics at the LHC
The study of ultra-high-energy cosmic rays (UHECR), i.e. nuclei exceeding energies of $10^{18}$ eV, and the extensive air showers they induce is closely intertwined with particle physics studied in experiments at accelerators, especially hadronic interactions. On the one hand, precise models of hadronic interactions, well constrained by accelerator data, are an invaluable ingredient to predict air shower observables for a given primary particle and, in return, to infer properties of the primary particle from measurements of these observables. On the other hand, UHECR-air interactions happen at centre-of-mass energies up to 400 TeV and allow probing particle physics far beyond the reach of the LHC.
In my talk I will review recent progress and remaining open problems of the field. In particular, I will focus on the so-called “muon puzzle”, a ≳ 40 % discrepancy between data and simulations w.r.t. the number of muons in UHECR air showers. I will outline how this is related to modelling of particle production in phase-space so-far poorly constrained by accelarator data, collective effects known in heavy-ion physics thay may play a role also in small systems, and how the upcoming oxygen run of the LHC may help to solve the mystery.Speaker: Maximilian Reininghaus
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62
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Heavy Ion Collisions and Critical Phenomena Room 1
Room 1
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63
Three regimes of QCD. Three years later.
I review the state of the arts for QCD matter above the chiral
restoration crossover that was called a stringy fluid. This
regime is characterized by the chiral spin symmetry of the
QCD effective action, which is a symmetry of the electric
interaction. Also other evidences for this regime, that is
qualitatively different from the QGP (that exists at essentially
higher temperatures), are discussed. The degrees of freedom here are
the color singlet hadron like strongly interacting states. In contrast, in QGP the degrees of freedom are partons. I will also discuss how this chiral spin symmetric regime extends into the QCD phase diagram at finite chemical potentials.Speaker: Leonid Glozman
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63
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Lepton-Nucleus scattering and Structure of the Nucleon Room 1
Room 1
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64
Virtual Compton Scattering and the Generalized Polarizabilities of the proton
The Generalized Polarizabilities (GPs) are fundamental properties of the nucleon. They characterize the nucleon's response to an applied electromagnetic field, giving access to the polarization densities inside the nucleon. As such the GPs represent a central path towards a complete understanding of the nucleon dynamics. Previous measurements of the proton electric GP at intermediate four-momentum transfer squared have challenged the predictions of theoretical calculations, raising questions in regard to the underlying reasons responsible for a local enhancement of the electric GP. The measurement of the magnetic GP on the other hand promises to quantify the interplay of the paramagnetism and diamagnetism contributions inside the proton. An overview on this topic, new results from JLab and future prospects will be discussed in this talk.
Speaker: Nikos Sparveris
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64
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13:00
Lunch
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15:00
Coffee break
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Cosmology, Astrophysics, Gravity, Mathematical Physics Room 4
Room 4
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65
The iron and nickel spectra measured with CALET on the International Space Station
Recent direct measurements of the energy spectra of charged cosmic ray have revealed unexpected spectral features, most notably the onset of a progressive hardening at few hundreds of GeV/n not only of proton and He spectra but also observable for heavier nuclei. Thus, the study of the spectra behavior of heavy elements may shed light on understanding propagation and acceleration phenomena in our Galaxy. In particular, iron and nickel provide favorable conditions for observations thanks to the low background contamination from spallation of higher mass elements they are affected by.
The CALorimetric Electron Telescope, CALET, has been measuring high-energy cosmic rays on the International Space Station since October 2015. The instrument consists of two layers of segmented plastic scintillators, a 3 radiation length thick tungsten-scintillating fiber imaging calorimeter, and a 27 radiation length thick PWO calorimeter. It identifes the charge of individual elements up to nickel and beyond and it measures the energy of cosmic-ray nuclei providing a direct measurement of their spectra.
In this contribution, the iron and nickel spectra resulted after five years of data acquisition, are presented. Specifically, the analysis procedure and the assess of systematic errors are detailed, in addition to the ratio between the two fluxes. The energy range here presented covers the interval between 10 GeV/n and 2 TeV/n for the iron flux and between 8.8 GeV/n and 240 GeV/n for the nickel one. Both spectra are compatible with a single power law, showing similar shape and energy dependence.Speaker: FRANCESCO STOLZI -
66
The NEWSdm experiment for directional dark matter searches
Despite great efforts to directly detect dark matter (DM), experiments so far have found no evidence. The sensitivity of direct detection of DM approaches the so-called neutrino floor below which it is hard to disentangle the DM candidate from the background neutrino. One of the promising methods of overcoming this barrier is to utilize the directional signature that both neutrino- and dark-matter-induced recoils possess. The nuclear emulsion technology is the most promising technique with nanometric resolution to disentangle the DM signal from the neutrino background. The NEWSdm experiment, located in the Gran Sasso underground laboratory in Italy, is based on novel nuclear emulsion acting both as the Weakly Interactive Massive Particle (WIMP) target and as the nanometric-accuracy tracking device. This would provide a powerful method of confirming the Galactic origin of the dark matter, thanks to the cutting-edge technology developed to readout sub-nanometric trajectories. In this talk we discuss the experiment design, its physics potential, the performance achieved in test beam measurements and the near-future plans. After the submission of a Letter of Intent, a new facility for emulsion handling was constructed in the Gran Sasso underground laboratory which is now under commissioning. A Conceptual Design Report is in preparation and will be submitted in 2022.
Speaker: Andrey Alexandrov (Universita e INFN sezione di Napoli (IT))
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65
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Cosmology, Astrophysics, Gravity, Mathematical Physics Room 3
Room 3
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67
Expected performance and first results of the Radio Detector of the Pierre Auger Observatory
The Pierre Auger Observatory is currently the world’s largest detector for cosmic rays at the highest energies investigating their properties with unprecedented precision. The AugerPrime upgrade aims to enable mass sensitivity on an event-by-event level. Part of this upgrade is a Radio Detector (RD) that will increase the sky coverage of mass-sensitive measurements by measurements of inclined air showers with zenith angles between 65° to 85° by adding a radio antenna to each water-Cherenkov detector (WCD) station. The combination of radio and particle measurements allows the separation of the electromagnetic and muonic components of the air shower. This is a key ingredient for the understanding of the flux suppression at the highest energies. We will present the first results of an end-to-end simulation study for the performance of the RD. The potential to discriminate two different astrophysical source scenarios by their mass composition with the expected 10-year event statistics is shown. An engineering array with ten RD stations is installed in the field since fall 2019 to verify the calibration and air shower reconstruction procedures. The engineering array is fully integrated into the central data acquisition system and continuously records air showers. The first air showers detected simultaneously with the WCD and the RD will be presented. A comparison of measured radio signal per station and the prediction of CoREAS simulations based on the WCD reconstruction as input is shown.
Speaker: Marvin Gottowik
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67
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High Energy Particle Physics Room 2
Room 2
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68
Searches for rare top quark production and decay processes with the ATLAS experiment
Run 2 of the LHC has witnessed the observation of many rare top quark production
processes predicted by the Standard Model and has boosted searches for flavour-
changing-neutral-current interactions of the top quark, that are heavily suppressed in the SM. In this contribution the highlights are shown of searches by the ATLAS experiment for rare processes involving top quarks. Results are presented
for several associated top quark production processes of top quarks with Standard Model gauge bosons. The recent observation of associated production of a single top quark with a photon completes the list of processes and adds sensitivity to the EW couplings of the top quark. ATLAS furthermore reports strong evidence for the four-top-production process. Finally, results are presented of searches for flavour-changing-neutral-current processes involving top quarks. Searches in the full run 2 data set have been performed for tqg, tqgamma, tqZ and tqH interactions, with bounds exceeding previous limits by large factors.Speaker: Chenliang Wang (Shanghai Jiao Tong University (CN), CPPM, Aix-Marseille Université, CNRS/IN2P3 (FR)) -
69
Boosted W/Z boson and top tagging in ATLAS
The ability to differentiate between hadronically decaying massive particles is increasingly important to the LHC physics program. A variety of tagging algorithms for large-radius jets, reconstructed from unified-flow-objects (UFOs), are presented to identify jets containing the hadronic decay of W/Z bosons and top quarks, including both cut-based taggers and machine learning discriminants. The performance of new UFO jet-based taggers will be compared to the taggers deployed in ATLAS during Run-2 for jets reconstructed solely from calorimeter deposits.
Speaker: Qibin Liu (Tsung-Dao Lee Institute (CN) & Shanghai Jiao Tong University (CN)) -
70
Searches for new phenomena in final states with 3rd generation quarks using the ATLAS detector
Many theories beyond the Standard Model predict new phenomena, such as heavy vectors or scalar, vector-like quarks, and leptoquarks in final states containing bottom or top quarks. Such final states offer great potential to reduce the Standard Model background, although with significant challenges in reconstructing and identifying the decay products and modelling the remaining background. The recent 13 TeV pp results, along with the associated improvements in identification techniques, will be reported.
Speaker: Meng-Ju Tsai (University of Michigan) -
71
Recent results from the SND experiment at the VEPP-2000 collider
The Spherical Neutral Detector (SND) collects data at the VEPP-2000 $e^+e^-$ collider in Novosibirsk. In this talk we present the latest SND results on study of exclusive processes of $e^+e^-$ annihilation into hadrons at c.m. energies below 2 GeV. In particular, we discuss the measurement of the $e^+e^-\to\pi^+\pi^-$ cross section in the energy range 0.53--0.88 GeV, the measurements of the $e^+e^- \to n\bar{n}$ cross section near the production threshold, and the study of the radiative decays of excited light vector mesons to $\eta\pi^0\gamma$ and $\eta\eta\gamma$.
Speaker: Leonid Kardapoltsev (Novosibirsk State University (RU))
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68
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Quantum Physics, Quantum Optics and Quantum Information Room 1
Room 1
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72
Quantum interferometry with positrons and Positronium
I will discuss the recent first observation of antimatter quantum interferometry with positrons and discuss the possibility of gravitational measurement with Positronium
Speaker: Marco Giammarchi (Università degli Studi e INFN Milano (IT))
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72
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High Energy Particle Physics Room 1
Room 1
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73
Exploring coherent elastic neutrino-nucleus scattering with NUCLEUS experiment
The NUCLEUS experiment aims to perform a high-precision measurement of the coherent elastic neutrino–nucleus scattering (CEvNS) at the EdF Chooz B nuclear power plant in France. CEvNS is a unique process to study neutrino properties and to search for new physics beyond the Standard Model. CEvNS could also represent an unshieldable background for high-sensitivity dark matter experiments.
NUCLEUS is based on cryogenic detectors, operated at temperature of the order of 10 mK, with nuclear-recoil energy thresholds of the order of tens eV. At present, the experiment is under construction. The commissioning of the full apparatus is scheduled for 2022 at the Underground Laboratory of the Technical University Munich, in preparation for the move to the reactor site.Speaker: Vasile Mihai Ghete (Austrian Academy of Sciences (AT)) -
74
Latest results on K+ to pi+ nu nubar decay and precision measurements with Kaons at CERN
The NA62 experiment at CERN collected the world's largest dataset of charged kaon decays in 2016-2018, leading to the first measurement of the Branching Fraction of the ultra-rare K+ --> pi+ nu nu decay, based on 20 candidates. This provides evidence for the very rare K+→π+νν¯ decay, observed with a significance of 3.4σ. This measurement is also used to set limits on BR(K+→π+X), where X is a scalar or pseudo-scalar particle. The analysis of the 2018 data sample and the future NA62 plans and prospects are reviewed.
Results from studies of the radiative kaon decays K+ → pi0e+vg (Ke3g) are reported, using a data sample of O(100k) Ke3g candidates with sub-percent background contaminations recorded in 2017-2018. Preliminary results with the most precise measurements of the Ke3g branching ratios and of T-asymmetry in the Ke3g decay are presented.
The flavour-changing neutral current decay K+ -> pi+ mu+ mu- is induced at the one-loop level in the Standard Model. Preliminary results from an analysis of the K+ -> pi+ mu+ mu- decay an the most precise determination of the decay form-factor parameters 𝑎+ and 𝑏+ made by NA62 using data collected in 2017 and 2018 is reported.
Preliminary results of the K± → µ ± π0π0ν (Kmu400) decay first observation and analysis based on the NA48/2 data collected in 2003-2004 are also described.Speaker: Renato Fiorenza (Universita e INFN sezione di Napoli (IT)) -
75
Overview of the NOvA Experiment and the Latest Results
NOvA is an accelerator-based long-baseline neutrino experiment designed to study neutrino oscillations. In particular, NOvA aims to understand the dominance of matter over antimatter in the universe, to resolve the ordering of neutrino masses, and to resolve the octant of neu- trino mixing angle. For its physics goals NOvA uses two functionally-identical detectors. The Near Detector (ND) is situated at Fermilab, 1 km from the neutrino target and the Far Detector (FD) is located at Ash River, MN, a distance of 810 km from the neutrino source. The ND due to its close proximity to the neutrino source receives a high statistics neutrino flux which gives a unique opportunity for high precision neutrino cross-section measurements and is used as a control for the oscillation analyses. The FD is used to analyze the appearance and disappearance of the neutrinos arriving from the Fermilab. In this talk, I will give an overview of the NOvA experiment and the status of latest physics results.
Speaker: Prabhjot Singh
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73
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Workshop on Astro-Cosmo-Gravity Room 3
Room 3
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76
Angular distribution of Auger electrons following electron-impact excitation of highly charged Be-like ions
Electron-impact excitation (EIE) of atoms and ions is one of fundamental processes in astrophysical and laboratory plasmas. Chen et al. [1] studied the relativistic effect on the angular distribution of Auger electrons following EIE of Be-like ions. However, as a main part of the relativistic effect, the Breit interaction on the angular distribution was not considered. In this work [2], we study the angular distribution of the Auger electrons emitted from the nonradiative decay $1s2s^{2}2p_{1/2}$ $J$=$1$ → $1s^{2}2s$ $J$=$1/2$ of highly charged Be-like Mg$^{8+}$, Fe$^{22+}$, Mo$^{38+}$, Nd$^{56+}$, Au$^{75+}$, and U$^{88+}$ ions following the EIE $1s$ → $2p$ of these ions using the multiconfigurational Dirac-Fock method and the relativistic distorted-wave theory. Special attention is paid to the effect of the Breit interaction on the angular distribution of the Auger electrons. It is found that for low-Z ions the Breit interaction hardly contributes to the angular distribution, while for medium- and high-Z ions the contribution of the Breit interaction is of the essence, which becomes more prominent with increasing impact electron energy.
References
[1] M. H. Chen and K. J. Reed, Phys. Rev. A 50, 2279 (1994).
[2] Z. W. Wu, Y. Li, Z. Q. Tian, and C. Z. Dong, Phys. Rev. A 105, 032809 (2022).Speaker: Dr Zhongwen Wu (Helmholtz Institute Jena)
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76
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High Energy Particle Physics Room 3
Room 3
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77
The role of c \bar c and c\bar c g Fock-states in the coherent photoproduction of J/psi
Recent measurements from ALICE, CMS and LHCb Collaboration of exclusive production of J/ψ mesons in ultraperipheral heavy-ion collisions at the LHC have given us new access to the interaction of small color dipoles with cold nuclear matter. We discuss the role of cc̄ g-Fock states in the diffractive photoproduction of J/ψ-mesons. We have demonstrated, that the inclusion of inelastic shadowing due to high-mass diffractive states leads to an additional suppression of the coherent J/ψ photoproduction on lead. We observe that incorporation of cc̄ g-states improves agreement of the dipole approach with the midrapidity data of the ALICE collaboration.
Speaker: Agnieszka Łuszczak (Cracow University of Technolog & DESY Hamburg) -
78
Production of dileptons via photon-photon processes in proton-proton collisions with one forward proton measurement at the LHC
We discuss photon-photon fusion mechanisms of dilepton production in proton-proton collisions with rapidity gap in the main detector and one forward proton in the forward proton detectors. This is relevant for the LHC measurements by ATLAS+AFP and CMS+PPS. Transverse momenta of the intermediate photons are taken into account and photon fluxes are expressed in terms of proton electromagnetic form factors and structure functions. Differential distributions in ξ1/2, Mll, Yll, pt,ll, MR are shown, and the competition of different mechanisms is discussed. Both double-elastic and single-dissociative processes are included in the analysis. Different parametrizations of the structure functions are used. We discuss also mechanism with one forward Δ+ isobar or other proton resonances in the final state. The role of several cuts is studied. We also use the superchic generator and compare corresponding results to the results of our codes. The soft rapidity gap survival factor is calculated for each contribution separately. The gap survival factor for the single-dissociative mechanism due to minijet emission into the main detector is calculated in addition. It depends on the type of contribution (fully elastic, single dissociation, double dissociation). The soft rapidity gap survival factor for the case of single proton measurement is significantly smaller than that for the inclusive case (no proton measurement). We found only weak dependence on the invariant mass of the dilepton system as well as the lepton pair transverse momentum and sizeable dependence on the pair rapidity.
Published in: Phys.Rev.D 104 (2021) 7, 074009.
Speaker: Marta Luszczak
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77
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Multidisciplinary Session Room 4
Room 4
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79
Study for rare processes in naturally occurring Zr isotopes using Cs$_2$ZrCl$_6$ crystal scintillators
Recently, considerable interest has arisen in the development of crystal scintillators of the family of metal hexachlorides Cs$_2$MCl$ _6$ (M = Hf or Zr) thanks to their exceptional properties: a high light yield (up to 40000 photons/MeV), good linearity in the energy response, excellent energy resolution ($<3.5\%$ at 662 keV in the best configuration) and excellent pulse shape discrimination (PSD) between $\beta$($\gamma$) and $\alpha$ particles. In particular, we present here a first measurement using two Cs$_2$ZrCl$_6$ crystal scintillators ($\oslash$ $21\times 21$ mm$^2$ each) which has been performed at the DAMA/CRYS setup of LNGS. These crystals have been studied in terms of their chemical purity and residual radioactive contaminants, scintillation and PSD performances. Preliminary studies on single beta decays of $^{96}$Zr and double beta decays in isotopes of $^{94,96}$Zr have also been carried out and shown.
Speaker: Alice Leoncini
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79
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Cosmology, Astrophysics, Gravity, Mathematical Physics Room 4
Room 4
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80
Inflating and Reheating the Universe with an Independent Affine Connection
It will be discussed how a component of the dynamical affine connection, which is independent of the metric, can drive inflation in agreement with observations. This provides a geometrical origin for the inflaton. It will also be illustrated how the decays of this field, which has spin 0 and odd parity, into Higgs bosons can reheat the universe up to a sufficiently high temperature.
(Based on arXiv:2207.08830)
Speaker: Prof. Alberto Salvio (University of Rome and INFN Tor Vergata)
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80
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19:00
Opera Gala Room 1
Room 1
Opera Gala, Kalliopi Petrou (soprano), Tomaso Dorigo (Piano and Flute)
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20:00
Dinner
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Cosmology, Astrophysics, Gravity, Mathematical Physics Room 1
Room 1
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81
Constraints on the Hubble parameter H_0 with gravitational-waves events from the third observing run of LVK
The LIGO-Virgo-Kagra (LVK) collaboration uses a subset of 47 gravitational-wave (GW) events from the third observing run to constrain the cosmology and in particular the Hubble constant $H_0$. The Hubble constant can be constrained using the luminosity distance inferred from each GW signals of compact binary coalescence, combined with an estimation of their corresponding redshift. Two approaches are employed: the first one investigates the mass-redshift degeneracy and the second one makes use of an external galaxy catalog. The first method uses the mass-redshift degeneracy of the binary black-hole (BBH). By breaking this degeneracy, the cosmological parameters are inferred jointly along with the population of BBH systems. When combined with the binary neutron star event GW170817, the Hubble constant is estimated at $H_0 = 68^{+12}_{-8}km.s^{-1}.Mpc^{-1}$ ($68\% CI$). On the other hand, the galaxy catalog method statistically associates each BBHs source to its potential host galaxy, then infers the redshift from these galaxies’ information. Under the assumption of a fixed population model of BBHs, the Hubble parameter is estimated at $H_0 = 68^{+8}_{-6}km.s^{-1}.Mpc^{-1}$, which represents a 42% improvement in uncertainty compared to the value inferred from the first observing run of LVK. In the future, GW detections may play a significant role for cosmology, bringing a discriminating measurement of $H_0$ in the context of the Hubble tension.
Speaker: Grégoire PIERRA (Institut de physique des deux infinis) -
82
Gravitational waves over arbitrary background
Equations describing gravitational wave propagation over arbitrary curved space-time are derived. Some new terms absent in the FLRW background are obtained and their possible observational consequences are discussed.
The process of graviton-photon transformation in external magnetic field in the early universe are considered.Speaker: Alexander Dolgov
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81
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Quantum Physics, Quantum Optics and Quantum Information Room 1
Room 1
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83
Testing the Pauli Exclusion Principle with the VIP-2 Experiment and beyond
The Pauli Exclusion Principle (PEP) is one of the main cornerstones of the Quantum Theory at the basis of many phenomena, from the stability of the matter to neutron stars and from white dwarfs to superconductivity. Violation of the PEP, albeit small, could be motivated by physics beyond the known frontiers of the Standard Model which entail extra space dimensions, violation of the Lorentz invariance, non-commutative space-time. These scenarios can be experimentally constrained with stat-of-the-art X-ray spectroscopy, searching for forbidden electronic transition in atomic systems.
We look for the PEP violation with a complementary approach.
The VIP-2 Experiment at Laboratori Nazionali del Gran Sasso targets models where PEP violation signal can be realized only introducing new electrons into the atomic system. This is achieved by circulating a strong direct current in a copper target, searching for X-ray radiation emitted by the forbidden transitions using Silicon Drift Detectors. The analysis of the experimental VIP-2 data is presented. A brief outlook of the future VIP-3 experiment is also shown.
A large class of Quantum Gravity models have been shown to embed PEP violation as a consequence of space-time non-commutativity, avoiding the external-electron requirement. The energy scale of these quantum gravity models can be experimentally constrained with high-purity germanium detectors and low-radioactivity roman lead targets. The results of exploratory studies are discusses.Speaker: Fabrizio Napolitano
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83
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10:30
Coffee break
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Quantum Physics, Quantum Optics and Quantum Information Room 1
Room 1
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84
Searching for signal of wave function collapse in the cosmic silence
One of the main conundrums of physics is the quantum-to-classical transition. Models of Dynamical wave function Collapse (DCMs) explain it by a progressive reduction of the quantum superposition, proportional to the increase in mass of the system under consideration. Gravity-related collapse models, like the one developed by Diosi and Penrose (DP), aroused growing interest in the last decades, for the privileged role that gravity may play to solve the measurement conundrum.
The VIP-2 experiment, operated at the Laboratori Nazionali del Gran Sasso (LNGS) of INFN, is pursuing high sensitivity searches for “spontaneous radiation” signal, a faint radiation which would be unavoidably emitted by charged particles, as a side-effect of the collapse mechanism.
The strong bounds set by VIP-2 on the DP, and other models like the Continuous Spontaneous Localization will be presented. Future theoretical and experimental developments will be outlined.Speaker: Kristian Piscicchia (CREF, LNF (INFN))
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84
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High Energy Particle Physics Room 1
Room 1
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85
Highlights from the ANNIE experiment
The Accelerator Neutrino Neutron Interaction Experiment (ANNIE) is a Gadolinium-loaded water Cherenkov detector in the path of the Fermilab Booster Neutrino Beam. ANNIE seeks to measure the final state neutron abundance from neutrino-nucleus interactions, as a function of outgoing lepton kinematics. Such a measurement can be used to constrain or reduce systematic uncertainties and biases in future neutrino experiments.
ANNIE is also a testbed for innovative new detection technologies, from photosensors to detection media. A particular highlight is the recent installation in ANNIE of Large Area Picosecond Photodetectors (LAPPDs), novel micro-channel-plate-based devices which offer large detection area combined with ~100 ps time resolution. The first of five LAPPDs was installed in the ANNIE detector in March 2022, the first time one of these devices has ever been operated submerged in a liquid detection medium. We will review the overall status of ANNIE, including the installation of the remaining four LAPPDs, and discuss what the recent ANNIE beam run has taught us about LAPPD performance in an experimental context and the impact of LAPPDs on ANNIE science. We will also cover future R&D efforts related to the novel detection medium of water-based liquid scintillator (WbLS).Speaker: Amanda Weinstein -
86
Pre-Supernova neutrino alarm in Super-Kamiokande
The Super-Kamiokande (SK) experiment has now the potential of detecting yet-unobserved neutrinos coming from different astronomical sources after the gadolinium loading of the water in July, 2020. The improvement in identification of neutrons emitted from inverse beta decay reactions enhances therefore SK’s sensitivity to low energy electron anti-neutrinos. Pre-supernova stars, which are massive stars in the last stage of nuclear fusion before their core collapses, emit high fluxes of electron anti-neutrinos from thermal processes. The pre-supernova neutrinos from the silicon burning phase can be emitted over a few days before the core collapse, and their detection can provide early warnings for core collapses and subsequent supernovae. We report the sensitivity of Super-Kamiokande to these "pre-supernova" neutrinos and details of the alert system based on their detection, which has been running in SK since October, 2021.
Speaker: Lucas Nascimento Machado (University of Naples/INFN Naples) -
87
Recent Higgs boson results from ATLAS
Summary of recent Higgs boson results from ATLAS
Speaker: Soshi Tsuno (High Energy Accelerator Research Organization (JP)) -
88
Measurements of the mass, width and coupling CP structure of the Higgs-boson with the ATLAS detector
Measurements of the fundamental properties of the Higgs boson are presented, including its mass, width, and the CP properties of its coupling in various production modes and decay channels.
Speaker: Brian Le (University of Manchester (GB)) -
89
Overview of Higgs boson coupling measurements and their interpretations at the ATLAS experiment
Very detailed measurements of Higgs boson properties and its interactions can be performed with the full Run 2 pp collision dataset collected at 13 TeV, shining light on the electroweak symmetry breaking mechanism. This talk presents the latest measurements of the Higgs boson coupling properties by the ATLAS experiment in various bosonic and fermionic decay channels, as well as their combination. Results on production mode cross-sections, Simplified Template Cross Sections, and their interpretations are presented. Specific scenarios of physics beyond the Standard Model are tested, as well as a generic extension in the framework of the Standard Model Effective Field Theory, and in the framework of an Effective Field Theory.
Speaker: Georges Aad (CPPM, Aix-Marseille Université, CNRS/IN2P3 (FR))
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85
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13:00
Lunch
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15:00
Coffee break
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Cosmology, Astrophysics, Gravity, Mathematical Physics Room 3
Room 3
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90
The QCD axion at finite temperature and density
We show how the mass and self-coupling of the QCD axion change at finite temperature and baryon density within the framework of Nambu-Jona-Lasinio model. We mainly focus on the effect of the chiral symmetry restoration and two flavor color-superconductivity on the axion properties by taking into account the charge neutrality constraint. We find that both the axion mass and self-coupling become smaller in the thermal and dense medium. The possible influence of the axion on the cooling rates of the proto-neutron stars is discussed.
Speaker: Zhao Zhang (North China Electric Power University) -
91
Dark Matter Axions in the Early Universe with a Period of Increasing Temperature
We consider the production of axion dark matter through the misalignment mechanism in the context of a nonstandard cosmological history involving early matter domination by a scalar field with a time-dependent decay rate. In cases where the temperature of the Universe experiences a temporary period of increase, Hubble friction can be restored in the evolution of the axion field, resulting in the possibility of up to three "crossings" of the axion mass and the Hubble expansion rate. This has the effect of dynamically resetting the misalignment mechanism to a new initial state for a second distinct phase of oscillation. The resultant axion mass required for the present dark matter relic density is never bigger than the standard-history window and can be smaller by more than three orders of magnitude, which can be probed by upcoming experiments such as ABRACADABRA, KLASH, ADMX, MADMAX, and ORGAN, targeting the axion-photon coupling. This highlights the possibility of exploring the cosmological history prior to Big Bang Nucleosynthesis through searches for axion dark matter beyond the standard window.
Speaker: Jacek Osinski (AstroCeNT, Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences) -
92
The SABRE South Experiment at the Stawell Underground Physics Laboratory
The SABRE (Sodium iodide with Active Background REjection) experiment aims to detect an annual modulation signature in the rate of events observed due to dark matter interactions in ultra-high purity NaI(Tl) crystals in order to provide a model independent test of the signal observed by DAMA/LIBRA. It is made up of two separate detectors; SABRE South located at the Stawell Underground Physics Laboratory (SUPL), in regional Victoria, Australia, and SABRE North at the Laboratori Nazionali del Gran Sasso (LNGS).
SABRE South is designed to disentangle seasonal or site-related effects from the modulating dark matter-like signal. It is instrumented with ultra high purity NaI(Tl) crystals immersed in a linear alkyl benzene based liquid scintillator veto, further surrounded by passive steel and polyethylene shielding and a plastic scintillator muon veto. Significant work has been undertaken to understand and mitigate background processes, taking into account radiation from detector materials, from both intrinsic and cosmogenically activated sources as a very low background rate is essential to confirm or refute the results from DAMA/LIBRA.
SUPL is a newly constructed facility located 1024 m underground (~2900 m water equivalent) within the Stawell Gold Mine and is scheduled to be completed in June 2022. In addition to hosting the SABRE South experiment, this laboratory will house rare event physics searches, as well as measurement facilities to support low background physics experiments and applications such as radiobiology and quantum computing. The assembly of the SABRE South detector is planned to start once SUPL is finalised, with its commissioning occurring in 2023.
This talk will report on the newly built SUPL and the current status of the SABRE South experiment as well as present recent results from a detailed simulation of the SABRE South detector in order to characterise the background for dark matter searches.
Speaker: Peter McNamara (ARC Centre of Excellence for Dark Matter Particle Physics) -
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Muon measurements at the Pierre Auger Observatory
Muons in extensive air showers have large decay lengths and small
radiative energy losses. Therefore, muons can reach surface and underground detector arrays while keeping relevant information about the hadronic cascade. Data from several air shower experiments reveal inconsistencies in our current high-energy hadronic interaction models.
In most experiments, a larger muon content is observed compared to the hadronic model predictions. In this contribution, we report on the measurements of the muon content of air showers performed with the surface detector array of the Pierre Auger Observatory. In particular, we will focus on the overall muon content and its fluctuations. We also report on the first direct measurements of the muon content using the Engineering Array of underground muon detectors.Speaker: Eva Santos
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Cosmology, Astrophysics, Gravity, Mathematical Physics Room 4
Room 4
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Automatic alignment technique for the squeezing system in Advanced Virgo Plus (AdV+)
The sensitivity of gravitational wave (GW) interferometers is ultimately limited by
the quantum noise, which is due to vacuum fluctuations of the optical fields that entering from the dark port of the detector. Quantum noise affects the interferometer sensitivity in the entire bandwidth and it has two complementary effects: the shot noise, which depends on phase fluctuations of the optical field, dominates at high frequencies and decreases with laser power; radiation pressure noise, which depends on amplitude fluctuation of the optical field, perturbing the position of suspended mirrors at low frequencies and increases with laser power.
One way to improve the sensitivity of GW detectors is to inject squeezed vacuum into the dark port and a frequency-dependent-squeezing (FDS) generation is needed to achieve a broadband quantum noise reduction (for the next observation run). In AdV+ interferometer (the ongoing upgrade of Advanced Virgo) a 300 m long filter cavity was installed to produce FDS. The observable squeezing level can be reduced by the misalignments in the detection of squeezed light. Optimizing the alignments is fundamental and in this poster I will show the development of the automatic alignment loop in the AdV+ squeezing system using dither lines techniques.Speaker: Barbara Garaventa -
95
Searches for anisotropies in the arrival directions of Ultrahigh Energy Cosmic Rays
The study of cosmic rays with energies above $10^{18}$ eV contributes to a better understanding of the Universe. In particular, the study of anisotropy in their arrival directions is an important tool to unravel the sources of such particles. The state of the art in terms of experiments is currently represented by the Pierre Auger Observatory, the largest cosmic ray observatory in the world. Due to its size of 3,000 km$^2$, it collected an unprecedentedly large
data set over 17 years of operation. In this work we describe results related to anisotropy studies obtained by using such events. These are the large-scale searches in the arrival direction of events with energies above 4 EeV and the analysis of arrival directions of the highest-energy events, exceeding 32 EeV. A remarkable dipolar modulation in right ascension for energies above 8 EeV is observed, as previously reported, with a statistical significance of 6.6$\sigma$ as well as evidence of anisotropy at intermediate angular scale with $\sim15^{\circ}$ Gaussian spread at 4$\sigma$ significance level for cosmic-ray energies above $\sim$ 40 EeV.Speaker: Rogerio Menezes De Almeida -
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Deep-Learning based Reconstruction of the Depth of Shower Maximum and Muon Shower Content using the Water-Cherenkov Detectors of the Pierre Auger Observatory
Detecting cosmic rays at ultra-high energies exploits the calorimetric properties of the Earth's atmosphere, yielding extended particle showers with billions of secondary particles. Besides the direction and energy of the showers, determining the cosmic ray mass is an important objective for understanding the origin of these cosmic messengers and their acceleration mechanisms. Two mass-sensitive observables are the muon content and the depth of the shower maximum, both of which are encoded in the signal traces recorded with the ground-based water-Cherenkov detectors of the Pierre Auger Observatory. To decode the mass information from the traces, deep neural networks that use the concepts of recurrent and convolutional neural networks to exploit the data structure and symmetries of the detectors are employed. Trained on simulations, these networks predict the muon signal and depth of the shower maximum, respectively. The performance of the networks is evaluated on data and cross-checked with other detection methods. For the reconstruction of the depth of the shower maximum, the resolution reaches $25\mathrm{g}/\mathrm{cm}^2$, while the resolution of the muon signal ranges from 20% to 10%, depending on the zenith angle. Due to the duty cycle of nearly 100%, the number of events to be analyzed with the water-Cherenkov array yields a statistical power that is far superior to previous analyses. Thus, the application of deep learning provides an important step toward new insights into the mass composition of ultra-high-energy cosmic rays.
Speaker: Niklas Langner (RWTH Aachen University) -
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Very Special Linear Gravity: A Gauge-Invariant Graviton Mass
Linearized gravity in the Very Special Relativity (VSR) framework is considered. We prove that this theory allows for a non-zero graviton mass $m_g$ without breaking gauge invariance nor modifying the relativistic dispersion relation. We find the analytic solution for the new equations of motion in our gauge choice, verifying as expected the existence of only two physical degrees of freedom. Finally, through the geodesic deviation equation, we confront some results for classic gravitational waves (GW) with the VSR ones: we see that the ratios between VSR effects and classical ones are proportional to $(m_g/E)^2$, $E$ being the energy of a graviton in the GW.For GW detectable by the interferometers LIGO and VIRGO this ratio is at most $10^{-20}$. For GW in the lower frequency range of future detectors, like LISA, the ratio increases signficantly to $ 10^{-10}$, that combined with the anisotropic nature of VSR phenomena may lead to observable effects.
Speaker: JORGE ALFARO (Pontificia Universidad Católica de Chile)
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High Energy Particle Physics Room 2
Room 2
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98
Search for naturally occurring seaborgium with radiopure $^{116}$CdWO$_4$ crystal scintillators
A detector containing two radiopure cadmium tungstate crystal scintillators enriched in $^{116}$Cd at 82% ($^{116}$CdWO$_4$) with total mass of 1.2 kg was operated during 35324 h at the Gran Sasso Underground Laboratory (INFN, Italy) with the main aim to investigate double beta decay of $^{116}$Cd. As a by-product of the experiment, a new upper limit on atomic abundance of hypothetical naturally occurring long-lived seaborgium (eka-tungsten, Z=106) in tungsten was set at $5.1 \times 10^{-15}$ atom (Sg)/atom (W) with 90% C.L. (assuming the Sg half-life of $10^9$ yr) by the analysis of the alpha decay events. This limit is better than those obtained with a ZnWO$_4$ scintillator and in other types of experiments, which used the accelerator mass spectrometry or searched for spontaneous fission of superheavy elements.
Speaker: Fabio Cappella (INFN) -
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Latest results on rare decays with NA62
The NA62 experiment at CERN took data in 2016--2018 with the main goal of measuring the K+ -> pi+ nu nubar decay.
The NA62 dataset is also exploited to search for light feebly interacting particles produced in kaon decays. Searches for K+→e+N, K+→μ +N and K+→μ+νX decays, where N and X are massive invisible particles, are performed by NA62. The N particle is assumed to be a heavy neutral lepton, and the results are expressed as upper limits of O(10−8)of the neutrino mixing parameter |Uμ4|2. The X particle is considered a scalar or vector hidden sector mediator decaying to an invisible final state. Upper limits of the decay branching fraction for X masses in the range 10–370 MeV/c2 are reported. An improved upper limit of 1.0 x 10−6 is established at 90% CL on the K+→μ+ννv branching fraction.
Dedicated trigger lines were employed to collect dilepton final states, which allowed establishing stringent upper limits on the rates lepton flavor and lepton number violating kaon decays.Upper limits on the rates of several K+ decays violating lepton flavour and lepton number conservation, obtained by analysing this dataset, are presented.Speaker: Roberto Piandani (Univ. Autonoma de San Luis Potosi) -
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Spectroscopy of heavy-light baryons in quark-diquark picture
We study the heavy-light baryons in picture of heavy quark-light diquark cluster. Modified Regge relation between mass and angular momentum, derived using flux tube model, is used to predict spin-average masses. Spin dependent interactions are also included to compute mass spectrum of heavy-light baryons. Predicted masses of these systems matches well with experimentally observed masses. We predict spin and parity of experimentally observed states whose spin and parity are not confirmed yet.
Speaker: Ms Pooja Jakhad (Sardar Vallabhbhai National Institute of Technology)
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High Energy Particle Physics Room 1
Room 1
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101
Probing the nature of electroweak symmetry breaking with Higgs boson pair-production at ATLAS
In the Standard Model, the ground state of the Higgs field is not found at zero but instead corresponds to one of the degenerate solutions minimising the Higgs potential. In turn, this spontaneous electroweak symmetry breaking provides a mechanism for the mass generation of nearly all fundamental particles. While the Standard Model makes a definite prediction for the Higgs boson self-coupling and thereby the shape of the Higgs potential, enhanced rates and modified kinematic properties of Higgs boson pair (HH) production are a smoking-gun signature for new physics. In this talk, the latest searches for Higgs boson pairs by the ATLAS experiment are reported, with emphasis on the results obtained with the full LHC Run 2 dataset at 13 TeV. In the case of non-resonant HH searches, results are interpreted both in terms of sensitivity to the Standard Model and as limits on the Higgs boson self-coupling. Extrapolations of recent HH results towards the High Luminosity LHC upgrade are also discussed. Search results on new resonances decaying into pairs of Higgs bosons are also reported.
Speaker: Alessandra Betti (Sapienza Università e INFN, Roma I (IT)) -
102
Measurements of the Higgs boson fiducial and differential cross sections at the ATLAS experiment
With the pp collision dataset collected at 13 TeV, detailed measurements of Higgs boson properties can be performed. The Higgs kinematic properties can be measured with increasing granularity and interpreted to constrain beyond-the-Standard-Model phenomena. This talk presents the measurements of the Higgs boson fiducial and differential cross sections exploiting various Higgs boson decays, as well as their combination and interpretations.
Speaker: Yasuyuki Horii (Nagoya University (JP)) -
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Searches for additional Higgs bosons in ATLAS
The discovery of the Higgs boson with a mass of about 125 GeV completed the particle content predicted by the Standard Model. Even though this model is well established and consistent with many measurements, it is not solely capable of explaining some observations. Many extensions of the Standard Model addressing such shortcomings introduce additional Higgs-like bosons which can be either neutral or charged. The current status of searches for additional low- and high-mass Higgs bosons based on the full LHC Run 2 dataset of the ATLAS experiment at 13 TeV are presented.
Speaker: Noemi Cavalli (Universita e INFN, Bologna (IT))
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Cosmology, Astrophysics, Gravity, Mathematical Physics Room 1
Room 1
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104
Probing light Dark Matter with CRESST-III experiment
Despite plenty of evidence for Dark Matter (DM) making up over 80% of the total matter in the universe, the quest of revealing its nature is still ongoing. The CRESST-III (Cryogenic Rare Event Search with Superconducting Thermometers) experiment is dedicated to direct DM detection. The sought-for signal is expected to originate from a DM particle scattering elastically off detector material nuclei. Crystals of various materials, such as CaWO$_4$, Al$_2$O$_3$, LiAlO$_2$, and Si, are operated as cryogenic calorimeters at mK temperatures. They are equipped with transition-edge-sensors (TES) for signal collection. Ultra-low energy thresholds of $\mathcal{O}(10~\text{eV})$, required for probing DM particles with sub-GeV masses, make CRESST-III one of the leading experiments in low-mass DM search. An unexpected background exceeding the level of known sources appears below 200 eV. The current data-taking campaign is dedicated to studying the origin of this so-called 'low energy excess' which is currently limiting the sensitivity of low-threshold experiments worldwide.
I will present an overview of the CRESST-III experiment and the latest results on both, DM search and low energy background investigation. Moreover, I will give an update on recent R&D efforts and conclude with the future perspectives of the CRESST DM program.Speaker: Margarita Kaznacheeva (TUM)
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Quantum Physics, Quantum Optics and Quantum Information Room 2
Room 2
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Mirror modular cloning and fast quantum associative retrieval
I will show that a quantum state can be perfectly cloned up to global mirroring with a unitary transformation that depends on one single parameter. This is equivalent to “perfect” cloning for quantum associative memories which, as a consequence efficiently hold exponentially more information than their classical counterparts. I will present a probabilistic quantum associative retrieval algorithm which can correct corrupted inputs and is exponentially faster than the address-based Grover alternative, albeit at the price of possible retrieval errors due to its probabilistic nature. This is particularly important in view of recent proposals to use quantum memories for fast associative data triggering in large throughput high-energy experiments at LHC.
Speaker: Maria Cristina Diamantini Trugenberger (Universita e INFN, Perugia (IT))
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Lecture and workshop ''Play your voice' Room 1
Room 1
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19:30
Sacred Music Concert, Kalliopi Petrou (soprano), Tomaso Dorigo (Piano and Flute)
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20:00
Dinner
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Cosmology, Astrophysics, Gravity, Mathematical Physics Room 1
Room 1
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107
Antimatter in the world. State of art.
Astronomical observations of the recent decade indicating to noticeable antimatter population in the Galaxy are reviewed. Different signatures of antimatter are discussed. Theoretical models leading to antistars in the Milky way are presented.
Speaker: Alexander Dolgov
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Mini-workshop on Machine Learning for Particle Physics Room 1
Room 1
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108
A Boosted kNN Regressor With 66 Million Parameters
We demonstrate how a nearest-neighbor algorithm can be endowed with a large number of free parameters by assigning weights and biases to all training events. The simultaneous optimization of the large number of parameters by gradient descent allows to obtain similar performances to those of neural networks or boosted decision trees, although at a much higher CPU price.
Speaker: Tommaso Dorigo (Universita e INFN, Padova (IT))
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High Energy Particle Physics Room 1
Room 1
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109
Highlights of the ATLAS top quark precision measurements
The large top quark samples in top quark pair and single top production have yielded
measurements of the production cross section of unprecedented precision and
in new kinematic regimes. They have also enabled new measurements of top quark properties that were previously inaccessible. In this contribution the highlights of
the ATLAS top quark precision program are presented. ATLAS presents in particular new measurements of the pair production cross section at 5 TeV and the single top-quark production cross section in the s-channel as well as of the charge asymmetry in top-quark pair production.Speaker: Adam Rennie (University of Glasgow (GB)) - 110
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109
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10:30
Coffee break
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High Energy Particle Physics Room 1
Room 1
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111
Differentiable programming for Experimental Design
The full optimization of the design and operation of instruments whose functioning relies on the interaction of radiation with matter is a super-human task, given the large dimensionality of the space of possible choices for geometry, detection technology, materials, data-acquisition, and information-extraction techniques, and the interdependence of the related parameters.
On the other hand, the construction of a fully differentiable pipeline and the use of deep learning techniques may allow the simultaneous optimization of all design parameters, overcoming issues coming from the underlying stochasticity of the involved processes. Such optimizations involve finding the minimum of a function describing a complex, multidimensional landscape.
In this talk I will describe gradient-descent-based optimization (powered by automatic differentiation tools) of a multidimensional phase space, and the issues that can be encountered in optimizing these complex landscapes, offering some possible solutions.
Speaker: Dr Pietro Vischia (Universite Catholique de Louvain (UCL) (BE)) -
112
Machine learning techniques for calorimetry
Nearly all physics analyses at CMS rely on precise reconstruction of particles from their signatures in the experiment’s calorimeters. This requires both assignment of energy deposits to particles and recovery of various properties across the detector. These tasks have traditionally been performed by classical algorithms and BDT regressions, both of which rely on human-engineered high level quantities. However, bypassing human feature engineering and instead training deep learning algorithms on low-level signals has the potential to further recover lost information and improve the overall reconstruction. We have therefore developed novel algorithms for particle reconstruction in the CMS calorimeters based on graph neural networks, which allow us to represent the energy deposits recorded in the calorimeter directly in our models. In this work we will show the performance of our GNN architecture in energy reconstruction in the CMS ECAL, where we obtain improved energy resolutions and resilience to effects such as detector gaps, early showering upstream of the calorimeter, and pileup with respect to the previous state-of-the-art approach. This contribution will also cover how similar approaches can be applied to energy reconstruction in test beam data for the CMS High-Granularity Calorimeter (HGCAL), planned for operation in the HL-LHC. Furthermore, we will discuss new developments in graph architectures which allow for single-pass reconstruction of multiple particles in dense environments such as the CMS HGCAL.
Speaker: Rajdeep Mohan Chatterjee (University of Minnesota (US)) -
113
First glance on ATLAS data with run-3
A first look at run 3 data from ATLAS.
Speaker: Stefano Rosati (Sapienza Universita e INFN, Roma I (IT)) -
114
Overview and innovations of the electronics of the New Small Wheel of the ATLAS Muon Spectrometer
The New Small Wheel upgrade of the ATLAS Muon Spectrometer at the LHC collider employs two detector technologies, the resistive Micromegas chambers and the small-strip Thin Gap Chambers, with a total of 2.45 M analog readout channels.
The electronics is required to support the two different detector technologies and provide both precision readout for tracking and a fast trigger. It will operate in a high background radiation region up to about 20 kHz/cm^2 at the expected HL-LHC luminosity of 7.5×10^34 /cm^2 /s. A difficult constraint is that the trigger decision must be ready about 1.1 µsec after the collision.
The architecture of the system is strongly defined by the CERN GBTx data aggregation ASIC and the newly-introduced FELIX data router of the ATLAS detector and the software-based data acquisition they enable.
The NSW electronics was designed and developed over the last ten years and consists of multiple radiation hard Application Specific Integrated Circuits, multiple front-end boards, dense boards with FPGA's and purpose-built Trigger Processor boards within the ATCA standard.
The NSW has been installed in 2021 and is undergoing integration within ATLAS for LHC Run 3. It must operate through the end of Run 4 (December 2032).
The presentation will focus on the more innovative aspects of the electronics.Speaker: Dr Lorne Levinson (Weizmann Institute of Science (IL)) -
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Triggers (CMS)
CMS selects interesting events using a two-tiered trigger system. The first level (L1), composed of custom hardware processors, uses information from the calorimeters and muon detectors to select events at a rate of around 100 kHz within a fixed latency of about 4$\mu$s. The second level, the high-level trigger (HLT), consists of a farm of processors running a version of the full event reconstruction software optimized for fast processing and reduces the event rate to around 1 kHz before data storage. The CMS trigger is a very dynamically evolving system due to the targeted physics studies, increasing luminosity and addition of new strategies. Recent additions to the HLT, scouting and parking, use event processing knowledge learnt over the past years to reduce the data size and store it for processing on accessible CPUs during the LHC shutdown, respectively. This talk will present the performance of the trigger in the previous years, the first results and upcoming developments for Run 3, as well as plans for HL-LHC.
Speaker: Abanti Ranadhir Sahasransu (Vrije Universiteit Brussel (BE))
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111
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13:00
Lunch
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15:00
Coffee break
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Cosmology, Astrophysics, Gravity, Mathematical Physics Room 4
Room 4
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116
Soliton solutions in supergravity
We present new soliton solutions in a class of four-dimensional supergravity theories. For special values of the parameters, the solutions can be embedded in the gauged maximal N=8 theory and uplifted in the higher-dimensional D=11 theory. We also find BPS soliton configurations, preserving a certain fraction of supersymmetry.
Solitons play a special role in classical physics as well as in quantum and string theory, determining a richer structure of the full non-perturbative regime. This different class of exact solutions can be obtained from a double Wick rotation of a former black hole configuration, the new solutions characterizing a regular spacetime configuration devoid of horizons.
In non-supersymmetric AdS gravity, solitons play a fundamental role as they can be treated as ground states for suitable field theories. The negative mass of the AdS soliton has a natural interpretation as the Casimir energy of gauge theory living on the conformal boundary. In a non-susy version of the AdS/CFT conjecture, this would indicate that the soliton is the lowest energy solution with the chosen boundary conditions, leading to a new kind of positive energy conjecture.
Finally, BPS gravitational solitons preserving a certain fraction of supersymmetry can be found, providing a privileged framework in studying the system evolution: the resulting dynamical equations are in fact typically first-order, as compared to the standard second order equations of motion.Speaker: ANTONIO GALLERATI (Politecnico di Torino, Dipartimento DISAT) -
117
Cosmological Fluctuations in Delta Gravity
About 70\% of the Universe is Dark Energy, but the physics community still does not know what it is. Delta Gravity (DG) is an alternative theory of gravitation that could solve this cosmological problem. Previously, we studied the Universe's accelerated expansion, where DG were able to explain the SNe data successfully. In this work, we explore the cosmological fluctuations that give rise to the CMB through a hydrodynamic approximation. We calculate the gauge transformations for the metric and the perfect fluid to present the equations of the evolution of cosmological fluctuations, providing the necessary equations to solve in a semi-analytical way the scalar TT Power Spectrum. These equations will be useful for comparing the DG theory with astronomical observations and thus being able to restrict the DG cosmology, testing the compatibility with the CMB Planck data, which are currently in controversy with SNe.
Speaker: JORGE ALFARO (Pontificia Universidad Católica de Chile) -
118
The DARKSIDE-20k neutron veto
Darkside-20k is a global direct dark matter search experiment situated at Laboratori Nazionali del Gran Sasso, designed to reach a total exposure of 200 tonne-years free from instrumental backgrounds. The core of the detector is a dual phase time projection chamber (TPC) filled with 50 tonnes of low-radioactivity liquid argon. This is surrounded by an active neutron veto, employing Gadolinium-loaded polymethylmethacrylate (Gd-PMMA), and hosted inside a protoDUNE-like cryostat. The most dangerous background to the dark matter search comes from nuclear recoils induced by radiogenic neutrons, since this process can mimic a dark matter scattering-induced recoil. Neutron-induced nuclear recoils are rejected by identifying the presence of the neutron. The DarkSide-20k detector has a novel design in which the neutron veto and the TPC are integrated into a single mechanical unit that sits in a common bath of low-radioactivity argon. The entire TPC wall is surrounded by a Gd-PMMA shell which is equipped with large area Silicon Photomultiplier (SIPMs) array detectors. The talk will be focus on current status of neutron veto design and expected performances.
Speaker: Daria Santone (Royal Holloway, University of London) -
119
Chiral effects from non-equilibrium left-handed neutrinos in core-collapse supernovae
Recently, the anomalous transport phenomena of relativistic fermions associated with chirality induced by external fields have been greatly explored in different areas of physics. Notably, such phenomena are in connection with various quantum effects such as the chiral anomaly and spin-orbit interaction. These chiral effects like the chiral magnetic and vortical effects have been recently included for the study of lepton transport in core-collapse supernovae (CCSN). In particular, to delineate the chiral effects on neutrino radiation, a novel chiral neutrino radiation transport equation is derived from the chiral kinetic theory, which incorporates quantum corrections pertinent to magnetic and vortical fields in the collision term. Through this collision term for left-handed neutrinos near thermal equilibrium, the anisotropic energy current of neutrinos triggered by magnetic fields is found, which could have a potential application to pulsar kicks. We show such back reaction of left-handed neutrinos out of equilibrium on the matter sector induces an electric current proportional to a magnetic field even without a chiral imbalance for electrons in CCSN. This chiral electric current generates a strong magnetic field via the so-called chiral plasma instability, which could provide a new mechanism for the strong and stable magnetic field of magnetars. We also numerically study the physical origin of the inverse cascade of the magnetic energy in the magneto-hydrodynamics including this current. Our results indicate that incorporating the chiral effects of neutrinos would drastically modify the hydrodynamic evolutions of supernovae, which may also be relevant to the explosion dynamics.
References:
[1] Jin Matsumoto, Naoki Yamamoto, Di-Lun Yang, "Chiral plasma instability and inverse cascade from nonequilibrium left-handed neutrinos in core-collapse supernovae", Rev. D 105, 123029 (2022).
[2] Naoki Yamamoto, Di-Lun Yang,"Magnetic field induced neutrino chiral transport near equilibrium", Phys.Rev.D 104, 123019 (2021).
[3] Naoki Yamamoto, Di-Lun Yang, "Chiral Radiation Transport Theory of Neutrinos", Astrophys.J. 895 (2020) 1, 56.Speaker: Di-Lun Yang (Academia Sinica)
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High Energy Particle Physics Room 1
Room 1
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120
Precision Timing with the CMS MIP Timing Detector
The Compact Muon Solenoid (CMS) detector at the CERN Large Hadron Collider (LHC) is undergoing an extensive Phase II upgrade program to prepare for the challenging conditions of the High-Luminosity LHC (HL-LHC). In particular, a new timing layer with hermetic coverage up to a pseudo-rapidity of |η|=3 will measure minimum ionizing particles (MIPs) with a time resolution of ~30ps. This MIP Timing Detector (MTD) will consist of a central barrel region based on LYSO:Ce crystals read out with silicon photomultipliers and two end-caps instrumented with radiation-tolerant low-gain avalanche diodes. The precision time information from the MTD will reduce the effects of the high levels of pile-up expected at the HL-LHC and will bring new and unique capabilities to the CMS detector. The time information assigned to each track will enable the use of 4D reconstruction algorithms and will further discriminate interaction vertices within the same bunch crossing to recover the track purity of vertices in current LHC conditions. For instance, in the analysis of di-Higgs boson production, a timing resolution of ~30-40 ps is expected to improve the effective luminosity by about 25% through gains in b-tagging and isolation efficiencies. We present motivations for precision timing at the HL-LHC and overview the MTD design, while also highlighting specific physics studies benefiting from the improved timing information.
Speaker: Patrizia Barria (Sapienza Universita e INFN, Roma I (IT)) -
121
Jet and MET reconstruction and calibration in ATLAS
Jets and Missing transverse momentum (MET), used to infer the presence of high transverse momentum neutrinos or other weakly interacting neutral particles, are two of the most important quantities to reconstruct at a hadron collider. They are both used by many searches and measurements in ATLAS. New techniques combining calorimeter and tracker measurements, called Particle Flow and Unified Flow, have significantly improved the reconstruction of both transverse momentum and jet substructure observables. The procedure of reconstructing and calibrating ATLAS Anti-kt R=0.4 and R=1.0 jets using in situ techniques is presented. The reconstruction and performance in data and simulation of the MET obtained with different class of jets and different pile-up suppression schemes, including novel machine learning techniques, are also presented.
Speaker: Romain Bouquet (APC, Sorbonne University, CNRS (Paris)) -
122
Simulated Detector Performance at the Muon Collider
The idea of a Muon Collider facility has regained interest in the context of future colliders R&D. It promises in fact great performances as Higgs factory and in terms of Beyond the Standard Model Physics, especially for Dark Matter portals. Despite the good physics potential and feasible infrastructure requirements, the construction of such a machine comes with relevant design challenges especially related to the presence of a Beam-Induced-Background (BIB) that introduces noise in the detection instrumentation. Here we present the main features of this background, and how the detector design is optimized to reduce it as much as possible in $\sqrt{s}=1.5$ TeV collisions. We also illustrate simulated reconstruction performances and show that the BIB effect can successfully be mitigated, allowing us to carry out a broad and exciting physics program for the future years.
Speaker: Federico Nardi (Universita e INFN, Padova (IT))
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120
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Workshop on Future of Fundamental Physics Room 3
Room 3
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123
Weighing the quantum vacuum with the Archimedes experiment
The Archimedes experiment comes within the debate around one of the longstanding problems of fundamental physics: the incompatibility between General Relativity and Quantum Theory, and aims at measuring the interaction between vacuum fluctuations and gravity. Archimedes will measure the force exerted by the gravitational field on a Casimir cavity whose vacuum energy is modulated with a superconductive transition, by using a balance as a small force detector. If the vacuum energy does interact with gravity, a force directed upwards acts on the cavity and can be interpreted as the lack of weight of the expelled EM modes, in similarity with the Archimedes buoyancy of fluid. The expected torque generated with this modulation is of the order of $10^{-13}$ $Nm⁄\sqrt{Hz}$ . To detect such a small force, a very sensitive beam-balance has been suitably designed. A first prototype has been installed and tested in the SarGrav Laboratories at the Sos-Enattos site, in Sardinia (Italy) which is seismically very quiet. The tilt sensitivity of the prototype has been measured to be below $10^{-12}$ $rad⁄\sqrt{Hz}$ in the region between 1 and 10 Hz, which makes it the most sensitive tiltmeter in the world, of particular interest as auxiliary sensor for gravitational waves interferometers. In the region of tens of mHz, instead, at which the Archimedes modulation will take place, the torque sensitivity is around few times $10^{-12} Nm⁄\sqrt{Hz}$. Currently, the final setup has also been installed at the same site, the commissioning of the instrument has started, and the final measurement of the vacuum weight is expected to be performed in 2024.
Speaker: Annalisa Allocca
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123
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Workshop on Laser fusion, a spin-off from heavy-ion collisions Room 2
Room 2
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124
The start up of laser induced nano fusion
Laser induced Inertial Confinement Fusion has many new ideas recently. In the NAPLIFE project our aim is to circumvent some of these by results from ultra-relativistic heavy ion reactions and nanotechnology. We aim for time-like detonation to avoid instabilities and slow spreading of the burning front and regulate the light absorption in the target by implanted nano-antennas. The initial validation experiments led to new interesting theoretical problems too.
Speaker: Laszlo Pal Csernai (University of Bergen) -
125
Particle-in-cell simulations for Nanofusion
Recently laser induced fusion a spin-off from heavy ion collisions was proposed, where implanted nanoantennas regulated and amplified the light absorption in the fusion target [L.P. Csernai et al., Physics and Wave Phenomena 28 (3), 187-199 (2020)]. The theoretical part in this kind of experiments is powered by plasma simulations, here, we will present the behaviour of nanoantennas built in a particle-in-cell environment. Using a simple kinetic model we will study the nanoantenna's lifetime and absorption properties both in vacuum and different mediums as well.
Speaker: Istvan Papp
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124
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Multidisciplinary Session Room 3
Room 3
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126
New Generation Superattenuators for Einstein Telescope
Seismic noise and local disturbances are dominant noise below 10 Hz (0.1-10 Hz). With the introduction of high performance seismic isolation systems based on mechanical pendula,the 2nd generation GW antennas have reached the scientific goal of the direct observation of GW signals thanks to the extension of the frequency band down to 10 Hz. Now,the 3rd generation instrument era is approaching and the Einstein Telescope giant interferometer is becoming a reality with the possibility to install the detector in an underground site where seismic noise is 100 times smaller then on surface. Moreover,new available technologies and the experience acquired in operating advanced detectors are key points to further extend the detection bandwidth down to 2-3 Hz with the possibility to suspend cryogenic payload and then mitigating Thermal Noise too.In this talk,we present the preliminary studies devoted to improve seismic attenuation performance of the Ad- vanced VIRGO Superattenuator in the low frequency region.Following the experimental lines,we analyze the possibility to improve the vertical attenuation performance with a multistage pendulum chain equipped with magnetic anti-springs that is hung to a double Inverted Pendulum in nested configuration.The feedback control requirements and the possible strategies to be adopted for this last element, will be presented.
Speaker: Lucia Trozzo (Istituto Nazionale di Fisica Nucleare)
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126
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Cosmology, Astrophysics, Gravity, Mathematical Physics Room 3
Room 3
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127
The present status of the LAG experiment
LAG (Liquid Actuated Gravity) is an R&D experiment, funded by the Italian National Institute of Nuclear Physics (INFN), for the development and testing of a new actuation technique for gravity experiments, based on a liquid field mass. The basic idea of the experiment is to modulate the gravitational force acting on a test mass by controlling the level of a liquid in a suitable container, thereby producing a periodically varying gravitational force without moving parts (apart from the liquid level) close to the test mass. The first scientific goal is to improve upon present limits on the gravitational inverse-square law in the mm to cm distance region. A prototype has been assembled for testing with a torsion pendulum facility in Napoli, and we are now taking data. We will describe the apparatus, report on present results and describe the next steps, and the scientific perspectives for the LAG experiment.
Speaker: Luciano Di Fiore
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127
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Diversity and Inclusion Room 1
Room 1
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128
The CERN Ombud: a zebrotentaculus?Speaker: Laure Esteveny (CERN)
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128
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Quantum Physics, Quantum Optics and Quantum Information Room 3
Room 3
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129
Quantum entangled beams to improve the sensitivity of gravitational wave interferometers
Vacuum fluctuations of the electromagnetic field are responsible for quantum noise in interferometric gravitational wave detectors.
The injection of squeezed vacuum states represents an effective solution to reduce it as it has been demonstrated first in GEO600 and afterwards in Advanced Virgo and Advanced LIGO, where it contributed to improve the detector sensitivity above 200 Hz by reducing quantum shot noise.
Recent upgrades will improve the sensitivity of these two last detectors at lower frequencies by reducing technical noises that, during the previous scientific run, covered another component of quantum noise called “radiation pressure noise”. For this reason a broad-band quantum noise reduction, achievable using a “frequency-dependent” squeezing is needed. The adopted solution is to “filter” frequency-independent squeezed vacuum states, using a detuned external cavity.
In this talk, an innovative technique, based on Einstein-Podolsky-Rosen (EPR) entangled vacuum fields will be introduced.
This technique has been successfully tested in two table-top experiments, one performed in Germany and one in Australia, using a test cavity instead of the whole interferometer. Moreover, some Italian groups in collaboration with a Korean group are building an updated experiment where, for the first time, this technique will be employed in a radiation-pressure limited device: a small interferometer with suspended masses. This work, whose progress will be shown in the last part of the talk, is still ongoing.Speaker: Valeria Sequino -
130
Application of Quantum Machine Learning to HEP Analysis at LHC using Quantum Computer Simulators and Quantum Computer Hardware – Challenges and Opportunities
Machine learning enjoys widespread success in High Energy Physics (HEP) analysis at LHC. However the ambitious HL-LHC program will require much more computing resources in the next two decades. Quantum computing may offer speed-up for HEP physics analysis at HL-LHC, and can be a new computational paradigm for big data analysis in High Energy Physics.
We have successfully employed Variational Quantum Classifier (VQC) method, Quantum Support Vector Machine Kernel (QSVM-kernel) method and Quantum Neural Network (QNN) method for two LHC flagship analyses: ttH (Higgs production in association with two top quarks) and H->mumu (Higgs decay to two muons, the second generation fermions).
We will present our experiences and results of a study on LHC High Energy Physics data analysis with IBM Quantum Simulator and Quantum Hardware (using IBM Qiskit framework), Google Quantum Simulator (using Google Cirq framework), and Amazon Quantum Simulator (using Amazon Braket cloud service). The work is in the context of a Qubit platform. Taking into account the present limitation of hardware access, different quantum machine learning methods are studied on simulators and the results are compared with classical machine learning methods (BDT, classical Support Vector Machine and classical Neural Network). Furthermore, we do apply quantum machine learning on IBM quantum hardware to compare performance between quantum simulator and quantum hardware.
The work is performed by an international and interdisciplinary collaboration with the Department of Physics and Department of Computer Sciences of University of Wisconsin, CERN Quantum Technology Initiative, IBM Research Zurich, Fermilab Quantum Institute, BNL Computational Science Initiative, State University of New York at Stony Brook, and Quantum Computing and AI Research of Amazon Web Services.
This work pioneers a close collaboration of academic institutions with industrial corporations in a High Energy Physics analysis effort.
Though the size of event samples in future HL-LHC physics and the limited number of qubits pose some challenges to the Quantum Machine learning studies for High Energy Physics, more advanced quantum computers with larger number of qubits, reduced noise or close to noiseless quantum simulators and improved running time (as envisioned by IBM and Google) may outperform classical machine learning in both classification power and in simulations.
Although the era of efficient quantum computing may still be years away, we have made promising progress and obtained preliminary results in applying quantum machine learning to High Energy Physics. A PROOF OF PRINCIPLE.
Speaker: Rui Zhang (University of Wisconsin Madison (US))
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129
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Workshop on Laser fusion, a spin-off from heavy-ion collisions Room 2
Room 2
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131
LIBS Analysis of Pure, Deuterated and Au-doped UDMA:TEGDMA mixture: A Part of the Nanoplasmonic Laser Fusion Experiments
The presentation discusses various aspects of Laser Induced Breakdown Spectroscopy(LIBS), an emission spectroscopic technique used for elemental analysis. It focuses on the interaction of a femtosecond laser with a pulse duration of 50fs and repetition rate of 10Hzwith the polymeric composition of Urethane Dimethacrylate(UDMA) and Triethylene Glycol Dimethacrylate(TEGDMA), as well as UDMA doped with Au-nanorods.It also explores the behaviour of the deutarised UDMA samples with different laser intensities and delay times of the Laser shots.
Speaker: Dr Archana Kumari (Wigner Physics Research Center) -
132
Effect of the embedded plasmonic gold nanorods on the interaction of high intensity laser irradiation with UDMA polymer – morphological and structural changes during crater formation
The effects of gold nanorod doping and high intensity laser irradiation on the structural and the morphological changes of the urethane dimethacrylate (UDMA) based polymer systems were investigated and characterized using scanning electron microscopy (SEM) and Raman spectroscopy.
UDMA polymer samples with different concentration of gold nanoparticles were illuminated by single shot femtosecond laser pulses at different energies. The presence of the plasmonic nanoparticles induced significant changes in the surface- and the molecular structures compared to the undoped irradiated samples, which were used as reference.
The possible mechanisms of the surface topography formation and their features are demonstrated.Speaker: Judit Kaman -
133
Effect of the embedded plasmonic gold nanorods on the interaction of high intensity laser irradiation with UDMA polymer – the volume loss during crater formation
In this work we studied the effect of the addition of gold nanoparticles to urethane dimethacrylate (UDMA) polymer on the crater formation during high intensity femtosecond laser irradiation.
UDMA polymer samples were prepared without gold nanorods and with those in two different concentrations and were irradiated in different spots with single femtosecond laser pulses of different energies. It was observed that a certain amount of the polymer material is removed from the sample, and the surrounding of the formed craters was studied by white light interferometry. Our results prove the presence of plasmonic effect during the irradiation of the UDMA containing gold nanoparticles and suggest some interesting behaviour in the bonding structure of the polymer.Speaker: Agnes Nagyne Szokol (Wigner RCP) -
134
Raman spectroscopic study of structural transformations in methacrylate polymer doped with plasmonic gold nanoparticles upon irradiation with high-energy femtosecond laser pulse
Raman spectroscopy is widely used to characterize different materials through the vibrations of their constituents. It is highly sensitive to changes in bonding configuration, crystalline structure, isotope content, or even internal stress. We report on Raman spectroscopic studies of structural transformations in urethane dimethacrylate/triethylene glycol dimethacrylate copolymer nanocomposite doped with gold nanorods upon irradiation with a high-energy femtosecond laser pulse. The plasmon resonance of the nanorods has been tuned to the 800 nm wavelength of the laser, and the plasmonic enhancement of the electromagnetic field in their vicinity resulted in surplus crosslinking and other alterations in the polymeric structure.
Speaker: Miklós Veres
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131
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High Energy Particle Physics Room 4
Room 4
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135
Rare four leptonic B_d meson decays in the Standard model
In the framework of the Standard Model we present a new theoretical predictions for partial widths, double and single differential distributions for four-leptonic decays of B_d - mesons. We consider the contributions of ω(782) and ρ(770) - resonances, vector charmonium resonances contributions, non-resonance contribution of the bb¯ - pairs, leading contribution of “weak annihilation” and bremsstrahlung. We use the model of vector meson dominance for calculation of resonances contributions and take into account a set of new contributions that were not previously considered.
Speaker: Anna Danilina (M.V. Lomonosov Moscow State University)
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135
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Poster Session
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136
Constraints on off-shell Higgs boson production and the Higgs boson total width in Z Z → 4l and ZZ → 2l2ν final states using LHC proton–proton collision data at √s = 13 TeV with the ATLAS detector
A measurement of off-shell Higgs boson production in the ZZ → 4l and ZZ → 2l2ν decay channels, where l stands for either an electron or a muon, is performed using proton-proton collisions data at a center of mass energy of √s=13 TeV at LHC collected by the ATLAS experiment. An observed (expected) upper limit on the off-shell Higgs signal strength, defined as the event yield normalized to the Standard Model prediction, obtained at 95% confidence level (CL). Assuming the ratio of the Higgs boson couplings to the Standard Model predictions is independent of the momentum transfer of the Higgs production mechanism considered in the analysis, a combination with the on-shell signal-strength measurements yield an observed (expected) 95% CL upper limit on the Higgs boson total width.
Speaker: Theodota Lagouri (Instituto De Alta Investigación - Universidad de Tarapacá (CL)) -
137
Spectra of Triply Heavy Baryons
Masses of triply charm-bottom baryons are calculated using the hypercentral Constituent Quark Model (hCQM) [1], a basic non-relativistic framework. Constituent Quark Models (CQMs) are widely used to describe the interaction of quarks inside the baryon. Hence, it is preferable to perform within a general framework like hCQM to understand internal quark dynamics. The hCQM is based on the idea of Constituent Quarks and it converts the three body interaction problem to one body interaction by using hypercentral co-ordinates. In the case of triply heavy baryons, it would be very interesting to observe the behavior of heavy quarks with each other inside the baryonic system. The model consists of the hyper Coulomb plus screening potential as confining potential to elaborate hypercentral quark interaction between the constituent quarks. Our predicted masses of radial states 1S - 4S of Ωccb++ and Ωcbb- baryons have been presented, compared with other references [2,3]. Radiative decay calculation is also performed in this work.
References:[1] A. Kakadiya, Z. Shah, K. Gandhi and A. K. Rai, Few-Body Syst. 63, 29 (2022).
[2] R. N. Faustov and V. O. Galkin, Phys. Rev. D 105, 014013 (2022).
[3] G. Yang et. al., Chin. Phys. C 44 023102 (2020).
Speaker: Chandni Menapara -
138
Performances of the Small-strip Thin Gap Chambers (sTGC’s) in the New Small Wheels of ATLAS
The instantaneous luminosity of the Large Hadron Collider at CERN will be increased by about a factor of five with respect to the design value by undergoing an extensive upgrade program overthe coming decade. The largest phase-1 upgrade project for the ATLAS Muon System was
the replacement of the first station in the forward regions with the New Small Wheels (NSWs) which took place during the long-LHC shutdown in 2019-2021.
The two Small Wheels are called A and C and cover a positive and negative pseudorapidity acceptance in the range |η| =1.3 to 2.7. Both Small Wheels have been successfully installed in ATLAS in 2021.
Along with resistive strips Micromegas, the NSWs is equipped with eight layers of small-strip thin gap chambers (sTGC). The new system is designed to assure high tracking efficiency, reduction of fake trigger rates and precision measurement of muon tracks. In this presentation we will discuss performances of the sTGC detectors from data taken with the first LHC beam in summer 2022 and test beam data of 2021.Speaker: Sonia Kabana (Instituto De Alta Investigación - Universidad de Tarapacá (CL)) -
139
Studies on the sensitivity in measuring anomalous quartic gauge boson couplings using single and multi parametric models in the Effective Field Theory framework.
We present studies on the sensitivity in measuring anomalous quartic gauge boson couplings using single and multi parametric models in the Effective Field Theory framework. The studies are performed on the diboson ZZ production channel in pp colission at the LHC energies, where Z bosons decay to electron positron pairs or muon+ muon-pairs.
Speaker: Mr Alexandros Marantis (Hellenic Open University) -
140
ATLAS searches for Higgsinos with R-parity violating couplings in events with leptons
Searches for Supersymmetry through the direct production of Higgsinos decaying into final states with leptons and b-jets are presented. The two analyses are performed performed using 139fb-1 of the 13 TeV pp collision data collected with the ATLAS detector. The data-driven and Monte Carlo based methods used to estimated the Standard Model and detector backgrounds are discussed, as well as the shortcuts of each method. Finally, the results in selected signal regions, and some exclusion limits, are presented illustrating the significant improvement over the previous exclusion limits.
Speaker: Otilia Anamaria Ducu (IFIN-HH (Bucharest, RO)) -
141
Combination of Higgs boson pair production and single Higgs production at the LHC with the ATLAS detector
A combination of Higgs boson pair production and single Higgs production is performed using up to 139/fb of proton-proton collision data recorded with the ATLAS detector at a center-of-mass energy of sqrt(s) = 13 TeV at the LHC. The combination includes the bbbb, bbtautau and bbyy decay channels from the Higgs boson pair production and the ZZ to 4l, WW, yy, tt, bb, VH, bb (boosted), bb (VBF) and bb (ttH) decay channels from the single Higgs boson production. The results are expressed in terms of the constraints on the Higgs boson trilinear self-coupling modifier kLambda in two scenarios: 1. with all other coupling modifiers fixed to their SM values and 2. with the top coupling modifier kt profiled. In addition, a constraint contour on the (kLambda, kt) is also presented.
Speaker: Alkaid Cheng (University of Wisconsin Madison (US)) -
142
Discrete Relativity
Null four-vectors of General Relativity (GR), suggest mathematical developments. Two of them are presented. It is reminded that in GR a privileged frame exists, which is the frame in whch time elapses the most. It is showned that a particle generates locally a space-time deformation, which transforms this privileged frame according to the boost associated with its velocity in this frame. From this remark in physics and those mathematical developments, the motivation as well as the first developments of a new and discrete relativity appears naturally. It uses a four-momentum instead of the stress-energy tensor for calculation of space-time structure. It is showned that the surrounding effect prevailing in [1] appears also as the inner part of such a model. Under an unifying assumption, this surrounding effect appears in particle physics as well and suggests a possible solution of the Yang-Mills Millennium problem.
[1] F. Lassiaille, EPJ Web of Conf 182 03006 (2018).Speaker: Frederic Lassiaille -
143
Electron efficiency in LHC Run 2 with the ATLAS experiment
The electron reconstruction, identification and isolation efficiencies measurements using 13 TeV pp collision data collected with the ATLAS detector during the LHC Run-2 is discussed. The poster covers also the fake/non-prompt lepton background sources and estimation methods in some selected ATLAS searches with multiple leptons.
Speaker: Otilia Anamaria Ducu (IFIN-HH (Bucharest, RO)) -
144
Energy-dependent flavor ratios, cascade/track spectrum tension and high-energy neutrinos from magnetospheres of supermassive black holes
The IceCube neutrino observatory measures the diffuse flux of high-energy astrophysical neutrinos by means of various techniques, and there exists a mild tension between spectra obtained in different analyses. The spectrum derived from reconstruction of muon tracks is harder than that from cascades, dominated by electron and tau neutrinos. If confirmed, this tension may provide a clue to the origin of these neutrinos, which remains uncertain. Here we investigate the possibility that this tension may be caused by the change of the flavor content of astrophysical neutrinos with energy. We assume that at higher energies, the flux contains more muon neutrinos than expected in the usually assumed flavor equipartition. This may happen if the neutrinos are produced in regions of the magnetic field so strong that muons, born in pi-meson decays, cool by synchrotron radiation faster than decay. The magnetic field of ∼104G is required for this mechanism to be relevant for the IceCube results. We note that these field values are reachable in the immediate vicinity of supermassive black holes in active galactic nuclei and present a working toy model of the population of these potential neutrino sources. While this model predicts the required flavor ratios and describes the high-energy spectrum, it needs an additional component to explain the observed neutrino flux at lower energies.
Speaker: Kirill Riabtsev (Moscow State University) -
145
Heavy flavored tetraquarks in a diquark-antidiquark configuration
We systematically calculate the mass-spectra of tetraquarks [$cc\bar{b}\bar{b}$] and [$bb\bar{c}\bar{c}$] in a non-relativistic diquark-antidiquark model. The spin-dependent terms have been incorporated to describe the splitting structure for orbital and radial excitations. We have successfully obtained the experimentally observed $B_{c}^{\pm} $ mesons to fit the model’s parameters which are used to obtain the masses of tetraquarks. The masses of these tetraquarks are found to be in the range of 12.5 GeV- 13.5 GeV, and are compared with the two-meson threshold. The details of the study will be presented in the conference.
Speaker: Ms Juhi Oudichhya (Sardar Vallabhbhai National Institute of Technology Surat, Gujarat, India) -
146
Nonperturbative corrections and hypothesis of vacuum dominance
In this work we check the range of values which quark condensate can take, basing on our method: processing of experimental data on $e^+e^-$-annihilation into even number of pions (BaBar, CMD-2, OLYA) by constructing the Adler function in two ways (through dispersion representation and through the OPE series), applying the Borel transform, compiling the sum rule, and extracting of nonperturbative corrections.
We check the hypothesis of vacuum dominance, and a possibility of other intermediate states, contributing to four-quark condensate.
How other nonperturbative corrections ($C_2$ and $C_4$ or gluon condensate) change when the additional contribution of intermediate states is taken into account?
It is shown that values of quark condensate that are not more than 1.2 times higher than the average obtained value, which corresponds to the available data, but not 2 or 1.5 times, are acceptable.
In this case, $C_4$ takes values close to the previously known ones, while $C_2$ is compatible to zero or negative.Speaker: Marina Kozhevnikova -
147
Performance of the microCosmics detector
The microCosmics telescope is a low cost education cosmic ray detector that can be operated within the classroom or school laboratory. The microCosmics telescope consists of 3 scintillator detectors and a data acquisition system based on a digital PC based oscilloscope.
In this work we present the performance of the telescope using data collected from 4 different telescopes with similar geometrical layout. The telescope array was operated in coincidence within the Physics Laboratory of the Hellenic Open University, covering limited space (<30 sq. meters) i.e. the typical size of a high school classroom.Speaker: Antonios Leisos (Hellenic Open University) -
148
Search for direct production of electroweak gauginos in events with two same-sign or three leptons in 13 TeV pp collision data with the ATLAS detector
A search for supersymmetry (SUSY) through the production of electroweak gauginos in final states with two leptons with the same-sign electric charge or at least three leptons is presented. The analysed dataset corresponds to 139 fb-1 of proton-proton collision data collected at centre-of-mass energy of 13 TeV with the ATLAS detector at LHC. No significant excess over the Standard Model (SM) prediction is observed. Results are interpreted in terms of different R-parity conserving and R-parity violating models, and exclusion limits at 95% CL are set on the masses of the superpartners involved in the benchmark scenarios. Model-independent upper limits on the BSM events that may contribute to the signal regions defined in the analysis are also estimated.
Speaker: Shuhui Huang (University of Hong Kong (HK)) -
149
Search for new physics in multi-body invariant masses in dijet events with an isolated lepton in pp collisions at sqrt(s)=13 TeV with the ATLAS detector
A search for resonances in events with at least one isolated charged lepton (electron or muon) is performed using 139 fb^-1 of sqrt(s)=13 TeV proton-proton collision data recorded by the ATLAS detector at the LHC. Deviations from Standard Model predictions are tested in three- and four-body invariant mass distributions constructed from jets and leptons. The study reports first model-independent limits on generic resonances characterized by cascade decays of particles leading to multiple jets and leptons in the final state. Model-independent limits are calculated using Gaussian shapes with different widths. The multi-body invariant masses are then used to set upper limits at a 95% confidence level on various beyond the standard model physics scenarios.
Speaker: Dr Wasikul Islam (University of Wisconsin-Madison (US)) -
150
Search for new resonances decaying into a Higgs boson and a generic new boson X in the XH -> qqbb final state with the ATLAS detector
A search for heavy resonances Y decaying into a Standard Model Higgs boson (H) and a new boson (X) is performed with proton-proton collision data with the ATLAS detector at the CERN Large Hadron Collider. The physics channel where the Higgs decays into bb and the X to light quarks is considered, thus resulting in a fully hadronic final state. A two-dimensional phase space of Y mass versus X mass is scanned for evidence of a signal. Upper limits are set on the production cross-section of the resonance as a function of Y and X masses.
Speaker: Elvira Rossi (Universita e INFN sezione di Napoli (IT)) -
151
Search for single production of a vector-like $T$ quark decaying into a Higgs boson and top quark with fully hadronic final states using the ATLAS detector
A search is made for a vector-like $T$ quark decaying into a Higgs boson and a top quark in 13 TeV proton-proton collisions using the ATLAS detector at the Large Hadron Collider with a data sample corresponding to an integrated luminosity of 139 fb$^{-1}$.
The all-hadronic decay modes $H \rightarrow b\bar{b}$ and $t \rightarrow bW \rightarrow bq\bar{q}'$ are reconstructed as large-radius jets and identified using tagging algorithms.
Improvements in background estimation, signal discrimination, and a larger data sample, contribute to an improvement in sensitivity over previous all-hadronic searches.
No significant excess is observed above the background, so limits are set on the production cross-section of a singlet $T$ quark at 95\% confidence level, depending on the mass, $m_{T}$, and coupling, $\kappa_{T}$, of the vector-like $T$ quark to Standard Model particles.
This search targets a mass range between 1.0 to 2.3 TeV, and a coupling value between 0.1 to 1.6, expanding the phase space of previous searches.
In the considered mass range, the upper limit on the allowed coupling values increases with $m_{T}$ from a minimum value of 0.35 for 1.07 $ < m_{T} < $ 1.4 TeV up to 1.6 for $m_{T} = 2.3$ TeV.Speaker: Joel Hengwei Foo (University of Toronto (CA)) -
152
Solution of the Extended Trigonometric Scarf potential and its application in hadron Physics
The approximate solution of the Schrodinger equation in D-Dimensions for Extended Trigonometric Scarf potential was investigated using the Nikiforove-Uvarov (N-U) method. The method used to solve the Schrodinger equation for a charged particle at a center and noncentral potential have been developed using the Asymptotic Iteration Method, Dirac equation, and Klein-Gordon equation. This method was based on solving the second-order linear differential equation by reducing it to a generalized equation hypergeometric type by a suitable variable change.
The extended Trigonometric Scarf potential written as
\begin{equation}
V(r)=\frac{a\sin^2 \alpha r + b\cos^2 \alpha r + c\cos \alpha r+ d}{\sin^2 \alpha r}
\end{equation}
Using Extended Trigonometric Scarf potential new analytical exact energy eigenvalue and eigenfunction were obtained in fractional form using the N-U approach. We have used a heavy-light tetraquark system to verify the method's applicability and we have recalculated their mass spectra and fractional radial wave. The mass spectra obtained have been compared to experimental data and also found to improve in another comparison with other studies apart from that we also calculate heavy-heavy and heavy-light flavored meson mass spectra. We conclude that fractional models play a good role in hadron physics.Speaker: Ms Pooja Jakhad (Sardar Vallabhbhai National Institute of Technology, Surat, India) -
153
Study of the production of multi-strange baryons in pp collisions at 13 TeV using the ALICE detector
The investigation of the strange particle production in heavy-ion collisions is one of the ways to study quark-gluon plasma. One of the most striking observations is the increase of the ratio of (multi)strange hadron yields to non-strange hadrons yields for increasing charged-particle multiplicity in small collision systems. In this contribution, recent results on the Xi and Omega transverse-momentum spectra and yields measured in pp collisions at 13 TeV are presented. These results complement the existing picture obtained by measuring (multi)strange hadrons in different collision systems and energies and fill the gap in multiplicity between minimum-bias pp and peripheral Pb-Pb collisions.
Speaker: David Karatovic (University of Zagreb (HR)) -
154
Subcycle single-qubit quantum gates – an analytical approach
Decoherence in quantum computing can be
reduced by using quantum gates with operation time shorter
than the coherence time of the system. Ultrafast single-qubit
gates have been demonstrated on various physical systems
but still remains slow for some cases with respect to subcycle
timescales where the operation time is shorter than the
characteristic timescale of the system, determined by the
inverse of relevant transition frequency between its states. In
order to develop such subcycle quantum gates, we found their
analytical expressions for general pulse shapes by applying a
unitary perturbation theory. We identified the corresponding
rotation as a functional of a given pulse. Whether a specific
operation is allowed within a subcycle driving scheme may be
answered using the expressions.Speaker: Andrei Chuchalin (Korea Advanced Institute of Science and Technology)
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136
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19:30
Wine tasting
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20:00
Conference Dinner
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21:30
"Cretan night" with life music and danse Terrace between the two OAC buildings
Terrace between the two OAC buildings
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Heavy Ion Collisions and Critical Phenomena Room 1
Room 1
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155
Nuclear Tomography with Polarized Photon-Gluon Collisions at STAR
Equivalent photons from the intense electromagnetic fields produced by ultra-relativistic heavy nuclei can fluctuate into quark-antiquark pairs, interact coherently with a target nucleus and emerge as real vector mesons ($\phi$, $\rho^0$, $J/\psi$, etc.). It was recently discovered that the quasi-real photons manifest by such Lorentz-boosted electromagnetic fields are linearly polarized. While only one real vector meson is produced in one such interaction, the photon polarization and the indistinguishability of the target and source nuclei lead to quantum interference between two contributing amplitudes.
We present STAR measurements of the observation of a novel form of quantum interference due to the entanglement of the vector meson decayed daughters, which results in an interference pattern between distinguishable particles. Furthermore, we study this process in ultra-relativistic collisions with and without hadronic overlap to test for the potential decoherence caused by a femto-scale environment of strongly-interacting matter. To this end, we present measurements of the interference pattern in the momentum of the vector meson decayed daughters and compare the strength of the interference to theoretical models.
Speaker: Isaac Upsal -
156
Lambda polarization in heavy-ion collisions from hydrodynamic modelling (a review)
Polarization of Lambda hyperons, produced in relativistic heavy-ion collisions, has been discovered in 2017 by STAR experiment in the Beam-Energy Scan program at RHIC. The trends in the global Lambda polarization are in good agreement with hydrodynamic models. However, the transverse momentum dependence of polarization components in the out-of-plane direction and beam direction does not agree with the models, which still constitutes a puzzle.
In this talk we present practical calculations of lambda polarization components in the out-of-plane and and beam directions, in heavy-ion collisions at $\sqrt{s_{\rm NN}}$ from a few GeV to 5.02 TeV, in a 3+1 dimensional viscous hydrodynamic model vHLLE, and overview the results from hydrodynamic simulations by other groups. We show that the inclusion of a recently found additional term of the spin polarization vector at local equilibrium which is linear in the symmetrized gradients of the velocity field, and the assumption of hadron production at constant temperature and inclusion of bulkv viscosity in fluid dynamical simulations, restore the quantitative agreement between hydrodynamic model predictions and local polarization measurements in relativistic heavy ion collisions at $\sqrt{s_{\rm NN}}$=200 GeV and 5.02 TeV.Speaker: Iurii Karpenko (FNSPE CTU in Prague) -
157
Recent Results from the PHENIX Experiment at RHIC
In this talk we will focus on the most recent highlights from the ongoing data analysis of the PHENIX experiment.
Speaker: Axel Drees -
158
Recent highlights from the STAR experiment
The Solenoidal Tracker at RHIC (STAR) detector has excellent tracking and particle identification capabilities, as well as an electromagnetic calorimeter of fine granularity at mid-rapidity, which makes STAR a unique experiment to study the emergent properties of Quantum Chromodynamics (QCD) and Quantum electrodynamics (QED). The main physics goal of the heavy-ion collisions at RHIC top energy is to confirm the formation of the strongly-interacting Quark-Gluon Plasma (QGP) and study its properties. Additionally, the STAR Beam Energy Scan Phase II (BES-II) program is aimed to search for the possible critical endpoint in the QCD phase diagram. The ultra-relativistic heavy-ion collisions are also found to be an ideal place to study QED related phenomenon such as coherent photon-nucleus and photon-photon interactions.
In this talk, we will highlight selected results from Ru+Ru and Zr+Zr collisions at RHIC top energy as well as physics results from BES-II program. The physics implications of these results will also be discussed.
Speaker: Qian Yang (Shandong University)
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155
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10:30
Coffee break
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Heavy Ion Collisions and Critical Phenomena Room 1
Room 1
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159
Production of Exotic States in pp and A+A collisions at high energiesSpeaker: Larisa Bravina
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160
Total and partial shear viscosity of hadrons in heavy-ion collisions at intermediate energies
We calculate the total and partial shear viscosity of hadrons produced in central gold-gold collisions at intermediate energies [1,2]. For calculations of the collisions the transport model UrQMD is employed. The shear viscosity is obtained within the framework of Green-Kubo formalism. The hadron resonance gas (HRG) model is used to determine temperature and chemical potentials of baryon charge and strangeness out of the microscopic model calculations. Then, we determine the partial viscosity of main hadron species [3], such as nucleons, pions, kaons and Λ hyperons, by studying the relaxation of hot and dense nuclear matter in the box with periodic boundary conditions.
It is found that the decrease of the beam energy from Elab = 40AGeV to 10AGeV leads to rise of baryon shear viscosity accompanied by drop of shear viscosity of mesons. In contrast to that of non-strange hadron species, the shear viscosity of kaons and Λ remains independent on energy within the studied energy range. Its ratio over the entropy density increases with the drop of temperature and rise of baryon chemical potential.[1] M. Teslyk, L. Bravina, O. Panova, O. Vitiuk, and E. Zabrodin, Phys. Rev. C 101, 014904 (2020).
[2] E. Zabrodin, L. Bravina, M. Teslyk, and O. Vitiuk, Nucl. Phys. A 1005, 121861 (2021).
[3] M. Teslyk, L. Bravina, and E. Zabrodin, Symmetry 14(4), 634 (2022).Speaker: Evgeny Zabrodin -
161
Probing QGP Properties at the sPHENIX Experiment
The upcoming sPHENIX experiment is the next generation of large acceptance detector at RHIC, whose scientific goals center on probing the strongly interacting Quark-Gluon Plasma (QGP) with precision measurements of jets, heavy flavor, and upsilon production. The sPHENIX experiment is currently under construction and scheduled for first data in early 2023. Built around the excellent BaBar superconducting solenoid, the central detector consists of a silicon pixel vertexer adapted from the ALICE ITS design, a silicon strip detector with single event timing resolution, a compact TPC, novel EM calorimetry, and two layers of hadronic calorimetry. The hybrid streaming/triggered readout of the detector enables the full exploitation of the luminosity provided by RHIC. sPHENIX will significantly expand the observables and kinematic reaches of these measurements at RHIC and provide a comparison with the LHC measurements in the overlapping kinematic region. The talk will describe the readiness of the experiment for operations, present current projections of key jet, upsilon, heavy flavor, and cold QCD measurements, and discuss their potential scientific impact.
Speaker: Weihu Ma -
162
Search for Hypernuclei using STAR Express Stream Data with KF Particle Package
Within the FAIR Phase-0 program the algorithms of the FLES (First-Level Event Selection) package developed for the CBM experiment (FAIR/GSI, Germany) are adapted for online and offline processing in the STAR experiment (BNL, USA).
Long-lived charged particles are reconstructed in the Time Projection Chamber using the CA track finder algorithm based on the Cellular Automaton. The search for short-lived particles is performed by the KF Particle package based on the Kalman Filter using the reconstructed long-lived daughter particles produced in the decays of the searched short-lived mother particles.
As a result of adapting the algorithms to work online, an express data production chain was created on the STAR High Level Trigger (HLT) farm, that extends the HLT functionality in real time up to the physics analysis. An important advantage of the express analysis is that it allows to start calibration, production and analysis of the data as soon as they are received.
The STAR Beam Energy Scan II program, including fixed target Au+Au collisions taken in 2018–2021, is particularly suited to study hypernuclei. Light hypernuclei are expected to be abundantly produced in low energy heavy-ion collisions. Measurements of hypernuclei production and their properties will provide information on the hyperon-nucleon interactions, which are essential ingredients for understanding of nuclear matter equation-of-state at high net-baryon densities, and, hence, the structure of neutron stars.
With the heavy fragment trigger introduced for the 2021 data taking, we were able to run the express stream production at the STAR HLT farm to search for hypernuclei. The collected data were sufficient to observe the decay process of 5ΛHe →4Hepπ − with more than 11σ significance.Speaker: Ivan Kisel (Johann-Wolfgang-Goethe Univ. (DE))
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159
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High Energy Particle Physics Room 1
Room 1
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163
Recent Heavy Flavour results from ATLAS
Recent heavy flavour results from the ATLAS proton-proton collision dataset will be presented. Measurements of charmonium and B meson production will be reported. Results on B_c production and decays will also be discussed. New results on exotic resonances will be shown. The latest ATLAS measurements of the CP violation and rare decays will be reviewed.
Speaker: Umberto De Sanctis (INFN e Universita Roma Tor Vergata (IT))
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163
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13:00
Lunch
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15:00
Coffee break
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Heavy Ion Collisions and Critical Phenomena Room 3
Room 3
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164
Study the production of identified charged hadrons in Au+Au collisions at √sNN = 54.4 GeV using the STAR detector
Exploring the QCD phase diagram and searching for the QCD critical point are some of the main goals of the Beam Energy Scan program at RHIC. In 2017, the STAR experiment collected large dataset of Au+Au collisions at $\sqrt{s_{NN}} =$ 54.4 GeV. The identified particle spectra and yields provide information about the bulk properties of the hot medium created in these collisions. The centrality dependence of the freeze-out parameters explores a wide ($T$, $\mu_B$) region in the phase diagram facilitating the search for the QCD critical point.
We present the measurements of the production of $\pi^\pm$, K${^\pm}$, p, and $\bar{p}$ at midrapidity $|y|\leq 0.1$. The results for the transverse momentum spectra, particle yields dN/dy, average transverse momentum $\langle$p$_{T}$$\rangle$, and particle ratios will be presented for different centrality classes and compared with AMPT and HIJING model calculations. In addition, the extracted freeze-out parameters will be compared with the results at other collision energies. The physics implications of the results will be discussed.
Speaker: Arushi Dhamija -
165
Strange hadron production in d+Au collisions at √sNN = 200 GeV using the STAR detector
Strangeness production has been suggested as a sensitive probe to the early dynamics of the deconfined matter created in heavy-ion collisions. Ratios of particle yields involving strange particles are often utilized to study freeze-out properties of the nuclear matter, such as the strangeness chemical potential and the chemical freeze-out temperature. $\rm{d}$+Au data connect between Au+Au and $pp$ collisions, and supply the baseline for the study of strangeness enhancement in the deconfined matter. The study of nuclear modification factor in $\rm{d}$+Au collisions can also help to understand Cronin-like effects.
In this work, we will present new measurements on the production of strange hadrons ($K{_S}{^0}$, $\Lambda$, $\Xi$, $\Omega$) at mid-rapidity in $\rm{d}$+Au collisions at $\sqrt{s_{\rm{NN}}} =$ 200 GeV, recorded by the STAR experiment in 2016. We will report transverse momentum ($p_{\rm{T}}$) spectra, $p_{\rm{T}}$ integrated yield dN/dy, average transverse momentum, yield ratios, and nuclear modification factors for those strange hadrons. The physics implications of the measurement on the collision dynamics will be discussed.
Speaker: Ms Ishu Aggarwal (Panjab University Chandigarh) -
166
Attractors in flows with transverse dynamics
The medium formed after an ultrarelativistic heavy ions collision is subjected to a strong expansion along the beam (longitudinal) direction. The rapid longitudinal expansion gives rise to rapid hydrodynamization due to the so-called early-time attractor solution. Focussing on ultrarelativistic kinetic theory in the relaxation-time approximation, we address the robustness of this attractor in systems with detailed transverse profile and discuss the effect of transverse dynamics on attractor-like behavior.
[1] VEA, S. Busuioc, J. A. Fotakis, K. Gallmeister, C. Greiner, Phys. Rev. D 104 (2021) 094022.
Speaker: Victor Ambrus -
167
Correlations from short-range correlations and global baryon number conservation
Nowadays, the search for the predicted first-order phase transition between the hadronic matter and quark-gluon plasma is one of the most important challenges in high energy physics. This problem can be addressed based on studying the fluctuations of, e.g., net-baryon number, net-charge, or net-strangeness number measured in the relativistic heavy-ion collisions. The factorial cumulants and cumulants can be applied to quantify such correlations. However, the effects other than those related to the first-order phase transition, e.g. the impact parameter fluctuation or conservation laws, can also generate the correlations. In this talk, the baryon multiplicity factorial cumulants originating from the global baryon number conservation and the short-range correlations will be presented. The relations between the cumulants in a finite acceptance with global baryon conservation and the cumulants in the full system without baryon conservation will be shown with the next-to-leading order term.
Speaker: Michał Barej
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164
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Heavy Ion Collisions and Critical Phenomena Room 1
Room 1
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168
Recent heavy-flavor results from STAR
In ultra-relativistic heavy-ion collisions, a dense and hot QCD medium, called the Quark-Gluon Plasma (QGP) and composed of de-confined quarks and gluons, is created. Heavy quarks (charm and beauty) are produced dominantly in hard partonic scatterings in the early stage of the collisions and experience the whole medium evolution. Therefore, they are ideal probes to investigate the QGP properties. Measurements of open heavy-flavor hadron production provide information on the transport properties of the QGP, the degree of the heavy quark thermalization, and the hadronization mechanism. On the other hand, measurements of quarkonium production in heavy-ion collisions give us insight into the color screening mechanism, which causes the quarkonium bound states to dissociate in the QGP, and thermodynamic properties of the QGP. Quarkonium studies in $p$+$p$ and $p$+A collisions serve as the necessary baseline for A+A collisions, and help to understand the quarkonium production mechanism and the cold nuclear matter effects, respectively.
In this talk, we will report recent results on open heavy-flavor and quarkonium production in the STAR experiment at RHIC. Measurements of the $J/\psi$ suppression and elliptic flow in isobar (Ru+Ru and Zr+Zr) collisions at $\sqrt{s_{NN}}$ = 200 GeV, as well as studies of the system size and energy dependence of the $J/\psi$ suppression will be shown. Production of quarkonia in $p$+$p$ collisions, including $J/\psi$ production in jets and with jet activity, will also be presented. Moreover, we will show measurements of electrons from open heavy-flavor hadron decays, and $D^{0}$, $D^{\pm}$, $D_{S}$, and $\Lambda_{C}$ production in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. The extracted total charm quark production cross section per nucleon-nucleon collision in Au+Au collisions will be reported. We will also present the first measurements of the production yield and radial profile of $D^{0}$-tagged jets in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. Finally, prospects of heavy-flavor measurements in STAR with high luminosity Au+Au RHIC Runs in 2023 and 2025 at $\sqrt{s_{NN}}$ = 200 GeV will be discussed.
Speaker: Barbara Antonina Trzeciak (Czech Technical University in Prague) -
169
PHENIX resuls on Heavy Flavor Production
Heavy flavor and quarkonia production is a powerful tool to study the properties of the Quark Gluon Plasma (QGP). Heavy quarks lose their energies via final state interactions in the QGP. The magnitude of the energy losses is expected to depend on their mass. The elliptic flow of charm and bottom also provide a medium coupling of heavy flavor with the QGP. The suppressions of quarkonia production is a clear signal of the final state effect in QGP. The comparison of the nuclear modification in p/d+A and A+A enables to disentangle the cold nuclear effect and hot QGP effect. PHENIX measured the nuclear modification of the open heavy flavor and quarkonia production in small and large collision system with mid- and forward rapidity.
In this talk, the latest results of heavy flavor and quarkonia production in different collision systems are presented, and thier nuclear modifications as function of transverse momentum, centrality, and rapidity are discussed.Speaker: Takashi Hachiya (Nara Women's University (JP))
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168
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High Energy Particle Physics Room 2
Room 2
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170
Perspectives of tau g-2 measurements with ALICE
Ultra-peripheral collisions of heavy ions give physicists an opportunity for studies of two-photon induced processes in a clean environment with strongly suppressed hadronic interactions. In particular, measurements of cross section of the process $\mathrm{Pb}+\mathrm{Pb} \rightarrow \mathrm{Pb}+\mathrm{Pb} + \tau^{+}\tau^{-}$ can be used to set new constraints on poorly known anomalous magnetic moment of $\tau$-lepton. Obtaining a precise experimental value for tau $g-2$ becomes especially important in view of new data from the Muon $g-2$ experiment and also for verification of Standard Model extensions, including supersymmetry and theories with composite leptons. In recent results from ATLAS and CMS experiments, tau $g-2$ precision is limited by significant systematic uncertainties and insufficient size of data sample due to trigger constraints. With the ALICE experiment in Run 3 it will be possible to address lower transverse momenta for reconstructed charged particles to increase the number of available events. In this work, realistic simulations of the ALICE detector were carried out for event selection strategy developments for central and forward rapidity regions. In this contribution, the results of these studies will be presented. The impact of experimental and theoretical uncertainties on the extraction of tau $g-2$ limits will be discussed.
Speaker: Nazar Burmasov (NRC Kurchatov Institute PNPI (RU)) -
171
Searches for BSM physics using challenging and long-lived signatures with the ATLAS detector
Various theories beyond the Standard Model predict new, long-lived particles with unique signatures which are difficult to reconstruct and for which estimating the background rates is also a challenge. Signatures from displaced and/or delayed decays anywhere from the inner detector to the muon spectrometer, as well as those of new particles with multiple values of the charge of the electron are all examples of experimentally demanding signatures. The talk will focus on the most recent results using 13 TeV pp collision data collected by the ATLAS detector.
Speaker: Ms Mariia Didenko (Univ. of Valencia and CSIC (ES)) -
172
Measurements of photons and multijet events with ATLAS
The production of jets and photons at hadron colliders provide stringent tests of perturbative QCD. We present the latest measurements using proton-proton collision data collected by the ATLAS experiment at sqrt(s)=13 TeV. We will discuss the measurement of new event-shape jet observables defined in terms of reference geometries with cylindrical and circular symmetries using the energy mover's distance. The results are unfolded for detector effects and compared to the state-of-the-art next-to-leading order parton shower generators. If ready, the measurement of strong coupling constant will be presented using the ratio of 3-jet to 2-jet events. Finally, prompt inclusive photon production is measured for two distinct photon isolation cones, R=0.2 and 0.4, as well as for their ratio.
Speaker: Josu Cantero (Univ. of Valencia and CSIC (ES)) -
173
Spectroscopy of light, strange mesons in Regge phenomenology
The study of light quark mesons plays a significant role both theoretically and experimentally. In the present work, the mass-spectra of the light mesons ($u\bar{s}$ and $s\bar{s}$) is systematically studied within the framework of Regge phenomenology. Several relations between Regge slope, intercept, and meson masses are extracted with the assumption of linear Regge trajectories. Using these relations ground state masses ($1^{2}S_{0}$and $1^{3}S_{1}$) of the pure $s\bar{s}$ states are evaluated. Further, the Regge slopes for $1^{2}S_{0}$and $1^{3}S_{1}$ trajectories are extracted in the ($J,M^{2}$) plane to obtained the orbitally excited state masses for these mesons. Similarly, the values of Regge parameters are calculated in the in the ($n,M^{2}$ ) plane for each Regge lines and the obtained the radially excited state masses of mesons lying on that Regge trajectory. The main purpose to study the $s\bar{s}$ meson is that some of the reported exotic states may be the excited or mixed state of strangeonia. The obtained mass spectra could provide useful information in the future experimental searches.
Speaker: Juhi Oudichhya
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170
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Physics Education and Outreach: Diversity and Inclusion Room 4
Room 4
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174
Status Report of the μNet (micronet) Project.
The μΝet project aims to deploy and operate an extensive school network of educational Cosmic Ray telescopes throughout the Peloponnese region. As part of the μNet project, an extended educational program will be conducted, with educational activities focusing on the design, construction, testing, and operation of μCosmics detectors (microCosmics) as well as the remote operation of cosmic ray detection stations and astroparticle physics detectors deployed at the Hellenic Open University (HOU) campus. In the school year 2021-2022, a pilot program took place in which 18 schools from all over the country participated with 150 students and 21 teachers. Schools were responsible for maintaining a cosmic rays detector assigned to them. There were three schools that installed the detectors on their physical premises, while the rest operated detectors located at the Hellenic Open University through remote access. The three schools that had the detectors on site were located in Patras and the students and teachers of these schools carried out the construction of the detector unit of the telescope, while the remaining 15 of the 18 schools watched the construction on video. All schools calibrated their telescopes, measured extensive atmospheric showers caused by cosmic particles as they enter the atmosphere, and processed the data they collected online through a website built by the university's physics lab. Students and teachers in the program were trained on how to construct the detectors, calibrate the telescope, and operate them to measure extensive atmospheric showers from cosmic particles. All schools were trained using distance learning methods. In this report we briefly present the design of the educational activities as well as the tools developed for distance teaching and report the findings and results of the pilot action.
Speaker: Leonidas Xiros (Hellenic Open University) -
175
Pedagogical implications of semi-classical description of electrostatic fields
It is well-known that in certain contexts, there are striking analogies between light rays in geometrical optics and electrostatic field lines. For example, in the method of images, the image charge distribution plays the role of the virtual image in a mirror. It is also known that like optical refraction, the electrostatic field lines change direction as they are incident on a medium of different dielectric constant. Analogies like these are very illuminating, but often they are not explored in depth, since no new interesting ideas are expected to emerge from them. In this presentation, I will show that in fact, interesting physical ideas do emerge when one tries to explain such "optical" behaviour of electrostatic field lines. This is based on a semi-classical model of electrostatics that was presented in ICNFP 2020 to resolve the nonlocality problem of Aharonov-Bohm effect (Physica Scripta Vol. 96 084011 (2021)). It is hoped that this work will expand the horizon of the physics curriculum at the university level.
Speaker: Kolahal Bhattacharya (Homi Bhabha Centre for Science Education) -
176
Evolution of Regional, Age and Gender Demographics in the ATLAS Collaboration
The ATLAS Collaboration consists of more than 5000 members, from over 100 different countries. Regional, age and gender demographics of the collaboration are presented, including the time evolution over the lifetime of the experiment. In particular, the relative fraction of women is discussed, including their share of contributions, recognition and positions of responsibility, including showing how these depend on other demographic measures.
Speaker: Bill Murray (University of Warwick (GB))
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174
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High Energy Particle Physics Room 1
Room 1
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177
Wormholes in scalar-tensor theories of modified gravity
We study the possibility to construct a stable wormhole-like solution within scalar-tensor theories of modified gravity of beyond Horndeski type. We pay special attention to the behaviour of perturbations around the wormhole solution in the linearised theory and ensure that there are no pathological degrees of freedom which are able to ruin the solution. In result we suggest a specific example of the beyond Horndeski Lagrangian which admits a heathy wormhole solution and discuss its features.
Speaker: Victoria Volkova -
178
Scalar-tensor theories, no-go theorem and possibilities to circumvent it
Small review of no-go theorem in scalar-tensor theory (Horndeski theory and beyond) and recent advances in possibilities to avoid it. That includes disformal connection between different subclasses, models with strong gravity in the past and some special cases without instabilities.
Speaker: Sergey Mironov (INR)
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177
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179
Public Talk per internet by Prof. Johann Rafelski - "Searching for Viable Paths to Nuclear Fusion Energy" Room 1
Room 1
Nuclear fusion energy powers the Sun. The objective of harnessing this seemingly abundant potentially non-radioactive source of energy on Earth has a widespread interest. I will discuss: Nuclear fusion in stars and in the Universe; conventional approaches to realize it on Earth including the ITER experimental plasma reactor under construction, and the very big inertial confinement laser at NIF. However, these large efforts require tritium: The unstable tritium fuel generates lethal weapon-grade neutrons and needs to be artificially created. I will refocus attention and discuss the pros and cons of three modern fusion paths operating outside of thermal equilibrium constraints: Muon catalyzed nuclear fusion; Laser-driven proton acceleration used to spark micro-explosion fusion; and laser-driven coherent plasmon field-induced fusion. The last two approaches are relying on alternative light element fuels available for mining and are operating in an aneutronic manner.
Speaker: Johann Rafelski (University of Arizona) -
20:00
Dinner
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Cosmology, Astrophysics, Gravity, Mathematical Physics Room 1
Room 1
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180
Matter under extreme conditions in neutron stars and their mergersSpeaker: David Blaschke
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180
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Cosmology, Astrophysics, Gravity, Mathematical Physics Room 1
Room 1
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181
Highlights from the Pierre Auger Observatory
The Pierre Auger Observatory is the world's largest detector of
ultra-high-energy cosmic rays (UHECRs). Since the start of its operation
in 2004, a data set unrivaled both in quality and statistics was collected
with the Observatory using the fluorescence and surface detectors.
Currently, an upgrade of the Observatory, AugerPrime, consisting of the
addition of surface scintillator, radio and underground muon detectors is ongoing.
The aim of the upgrade is to enable the separation of electromagnetic
and muonic components of air showers using the ground detector array and
to increase its sensitivity to the mass of primary cosmic rays.In these proceedings, we present the most recent highlights from the
Pierre Auger Observatory on a broad range of results concerning energy
spectrum, mass composition, arrival directions and nuclear interactions
of UHECRs, multimessenger physics, search for neutral particles, and new
physics. In addition, we report on the first results obtained with the radio and
underground muon engineering arrays of the Pierre Auger Observatory.Speaker: Alexey Yushkov (Institute of Physics AS CR, Prague)
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181
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10:30
Coffee break
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Heavy Ion Collisions and Critical Phenomena Room 1
Room 1
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182
Searching QCD critical point with light-nuclei productions
Searching QCD critical point is one of the fundamental goals of heavy-ion collisions. The observed non-monotonic behavior with the colliding energies[1,2] was declared to be related to the critical point of the QCD phase diagram[3,4].
To reveal the critical fluctuations effects on the light-nuclei productions, one should address the problem of scale separation and magnitude separation problems. Specifically, the scale or the magnitude related to the background effects on light-nuclei production are dramatically larger than the ones of critical fluctuations, which hinders the detection of critical signal in light-nuclei individually. In this talk, I will focus on this problem and study the possible effect.
Within the coalescence model, we systematically study how does the background[5] and critical signal[6] play the role in the production of light nuclei. We find that the productions of light-nuclei with different number of constituent nucleons share the same structure up to second-order phase-space cumulants. Accordingly, we construct light-nuclei yield ratio which is directly proportional to the critical correction. The large scales related to light-nuclei are largely cancelled in the ratios and critical correlation length plays an important role. This reveals that the properly constructed yield ratios, not the yield individually, largely free from the scale and magnitude problems. In addition, we also predict a non-trivial behavior of the constructed light-nuclei yield ratios as the imprint the critical fluctuations and could be regarded as one of the candidates to probe the critical point.
[1] H. Liu, D. Zhang, S. He, K.-j. Sun, N. Yu, and X. Luo, Phys. Lett. B 805, 135452 (2020).
[2] D. Zhang (STAR), JPS Conf. Proc. 32, 010069 (2020).
[3] E. Shuryak and J M.Torres-Rincon, Eur.Phys.J.A 56 (2020) 9,241.
[4] K.-j. Sun, F.Li and C.M.Ko, Phys.Lett.B 816 (2021) 136258.
[5] S.Wu, K.Murase, S.Tang and H.Song, arXiv: nucl-th/2205.14302.
[6] S.Wu, K.Murase, S.Zhao and H.Song, to appear.Speaker: Shanjin Wu -
183
Light-nuclei production in heavy-ion collisions at $\sqrt{s_{\rm NN}}=$ 6.4--19.6 GeV in 3-fluid dynamics
We present results of simulations of the light-nuclei production in relativistic heavy-ion collisions within the updated event generator based on the three-fluid dynamics (3FD), complemented by Ultra-relativistic Quantum Molecular Dynamics (UrQMD) for the late stage of the nuclear collision~--- the Three-fluid Hydrodynamics-based Event Simulator Extended
by UrQMD final State interactions (THESEUS).
The light-nuclei production is treated with the thermodynamical approach on the equal basis with hadrons.
The simulations were performed for Pb+Pb and Au+Au collisions in the collision energy range of $\sqrt{s_{NN}}=$ 6.4--19.6 GeV. Their results are compared with available data from the NA49 and STAR collaborations, rapidity distributions and transverse-momentum spectra.
The updated generator revealed not perfect, but a reasonable reproduction of the data on the light nuclei, especially the functional dependence on the collision energy and light-nucleus mass.
It is important that this reproduction is achieved without any extra parameters, while the coalescence approach in 3FD requires special tuning of the coalescence coefficients for each light nucleus separately.
The collective flow, directed and elliptic ones, are also considered.Speaker: Marina Kozhevnikova -
184
Collision system size dependence of light (anti-)nuclei and (anti-)hypertriton production in high energy nuclear collisions
The collision system size dependence of light (anti-)nuclei and (anti-)hypertriton production is investigated using the parton and hadron cascade (PACIAE) model plus dynamically constrained phase-space coalescence (DCPC) model in 10B+10B, 12C+12C, 16O+16O, 20Ne+20Ne, 27Al+27Al, 40Ar+40Ar, 63Cu+63Cu, 96Ru+96Ru, 197Au+197Au, and 238U+238U collisions at √sNN = 200 GeV. The yield ratios of deuteron to proton, helium-3 to proton, hypertriton to Lambda-hyperon are predicted for various collision systems. In this study, we find the yield ratios between anti-(hyper-)nuclei are significantly suppressed compared to the ratios between the (hyper-)nuclei. It is also interesting to see the strangeness population factor s3 shows a non-smooth dependence of
atomic mass number A around 12 to 27, which can be related to the relative size of the produced nuclei and the emission source of different collision systems. Our present study provides a reference for a upcoming collision system scan program at RHIC.Speaker: Zhilei SHE -
185
Comparison of centrality dependent high pT direct photon and pi0 production in d+Au and p+Au collisions.
High $p_T$ direct photons produced in initial hard scattering are not affected by the colored medium formed in heavy ion collisions. This has been observed in large-on-large ion collisions, where, in contrast, jets and final state hadrons show energy loss, measured via the nuclear modification factor that compares the observed yields to the expected yield from p+p scaled by the number of binary nucleon-nucleon collisions. The energy loss correlates with the size of the medium, i.e. collision centrality, which in turn is characterized by the event activity in heavy-ion collisions, based on the fact that even in the presence of a hard collision most nucleon-nucleon interactions remain soft, assuring the proportionality between centrality (impact parameter) and soft particle production. Surprisingly, even in small systems, e.g. $p$+Au or $d$+Au collisions, high-transverse-momentum neutral hadrons appear to be suppressed in events with large event activity, although one would expect that the projectile proton, once participated in a hard collision, could produce only reduced number of soft particles. Even more puzzling, the nuclear modification factor appears to be enhanced in peripheral collisions, not observed in large colliding systems.
In this talk, by comparing the prompt photon and $\pi^0$ production measured by PHENIX in $d$+Au collisions at $\sqrt{s_{NN}} = 200$ GeV, and reporting on the status of the respective $p$+Au analysis, we will elaborate the reasons why the apparent centrality dependence is more likely to be a pT-dependent deviation from the proportionality of event activity and centrality in the underlying standard Glauber model calculations rather than a nuclear modification of hard scattering processes.Speaker: Zhandong Sun
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182
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High Energy Particle Physics Room 2
Room 2
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186
ATLAS searches for supersymmetry with prompt particles
Supersymmetry (SUSY) provides elegant solutions to several problems in the Standard Model, and searches for SUSY particles are an important component of the LHC physics program. This talk will present the latest results from SUSY searches conducted by the ATLAS experiment. The searches target multiple final states and different assumptions about the decay mode of the produced SUSY particles, including searches for both R-parity conserving models and R-parity violating models and their possible connections with the recent observation of the favour and muon g-2 anomalies. The talk will also highlight the employment of novel analysis techniques, including advanced machine learning techniques and special object reconstruction, that are necessary for many of these analyses to extend the sensitivity reach to challenging regions of the phase space.
Speaker: Shuhui Huang (University of Hong Kong (HK)) -
187
ATLAS searches for supersymmetry with long-lived particles
Various Supersymmetry (SUSY) scenarios, including split SUSY and anomaly or gravity-mediated SUSY-breaking scenarios, lead to signatures with long-lived particles. Searches for these processes may target either the long lived particle itself or its decay products at a significant distance from the collision point. These signatures provide interesting technical challenges due to their special reconstruction requirements as well as their unusual backgrounds. This talk will present recent results in long-lived SUSY searches using ATLAS Run 2 data.
Speaker: K.K. Gan (The Ohio State University (US)) -
188
Dedicated Triggers for Displaced Jets using Timing Information from Electromagnetic Calorimeter at HL-LHC
In this paper, we study the prospect of ECAL barrel timing to develop
triggers dedicated to long-lived particles decaying to jets, at the level-1 of
HL-LHC. We construct over 20 timing based variables, and identify two of them
which have better performances and are robust against increasing PU. We
estimate the QCD prompt jet background rates accurately using the "stitching"
procedure for varying thresholds defining our triggers, and compute the signal
efficiencies for different LLP scenarios for a permissible background rate. The
trigger efficiencies can go up to O(80%) for the most optimal
trigger for pair-produced heavy LLPs having high decay lengths, which degrades
with decreasing mass and decay length of the LLP. We also discuss the prospect of including the information of displaced L1 tracks to our triggers, which
further improves the results, especially for LLPs characterised by lower decay
lengths.Speaker: Prabhat Solanki -
189
Precision luminosity measurement at the CMS experiment in Run 2 and prospects for HL-LHC
Precision luminosity measurements are an essential ingredient to cross section measurements at the LHC and its high-luminosity upgrade (HL-LHC), needed to determine fundamental parameters of the standard model and to constrain or discover beyond-the-standard-model phenomena. The luminosity measurement of the CMS detector at the LHC, using proton-proton collisions at 13 TeV during the 2015–2018 data-taking period, is reported. The absolute luminosity scale is obtained with beam-separation scans, and several systematic uncertainty sources are studied, including additional contributions from the linearity and stability of the detectors. Meanwhile, the HL-LHC is foreseen to reach an instantaneous luminosity a factor of five to seven times the nominal LHC design value. The resulting, unprecedented requirements for luminosity and background monitoring measurements are presented, tackled by upgraded or new high-precision radiation-hard instrumentation at CMS. The exploitation of the tracker endcap pixel detector, the outer tracker, the hadron forward calorimeter, the barrel muon detectors and the 40 MHz scouting system is discussed together with the concept of a standalone luminosity and beam-induced background monitor using Si-pad sensors.
Speaker: Attila Jozsef Radl (Eotvos Lorand University (HU))
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186
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High Energy Particle Physics Room 4
Room 4
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Quantum Physics, Quantum Optics and Quantum Information Room 3
Room 3
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190
Observation and exploitation of quantum discord in many-body systems
Quantum correlations between parts of a composite system most clearly reveal themselves through entanglement. Designing, maintaining, and controlling entangled systems is very demanding, which raises the stakes for understanding the efficacy of entanglement-free, yet quantum, correlations, exemplified by quantum discord. Discord is defined via conditional mutual entropies of parts of a composite system, and its direct measurement is hardly possible even via full tomographic characterization of the system state. Here we design a simple protocol to detect quantum discord and characterize a discorded state in an unentangled bipartite system. Our protocol relies on a characteristic of discord that can be extracted from repeated direct measurements of current correlations between subsystems. The proposed protocol opens a way for extending experimental studies of discord to many-body correlated systems.
Metrological applications of quantum correlations are defined by the Fisher information which can be linked to the quantum geometric discord. Some measurements can be devised to exploit quantum discord and not the entanglement. The amplitude of oscillations of the probability distribution function, used to construct the Fisher Information, is bound from above by the geometric discord. This means that metrological advantage may be achieved with discorded untangled states which are more robust against environmental effects.
Speaker: Igor Yurkevich -
191
Broadband Quantum Noise reduction in a small-scale suspended interferometer
Quantum noise (QN), due to the contribution of Shot Noise (SN) and Radiation Pressure Noise (RPN), is one of the major limiting contributions to the sensitivity of ground-based Gravitational Waves (GW) detectors, such as Virgo and LIGO.
Frequency-independent squeezing (FIS) setups, introduced prior to the latest observing run O3, where proven to reduce QN in the high-frequency range, where SN dominates (>200 Hz), in both Virgo and LIGO [1, 5, 8]. In the meantime, FIS injection produced a small increase of QN at low frequency due to RPN [1, 2]. Hence, starting from the next observing run O4, a broadband QN reduction (10Hz-1kHz) is an unavoidable upgrade in GW detectors. The technique currently adopted in LIGO and Virgo detectors consists of a FIS source coupled to a 300 m long detuned filter cavity, which produces in reflection frequency-dependent squeezing (FDS) [8].
Looking forward, the development of more compact FDS setups is crucial for the third generation (3G) detectors such as the Einstein Telescope (ET). With the collaboration of serveral INFN teams, Italian Universities and the Korea Astronomy and Space Sciente Institute (KASI) we are developing two table-top experiments for the FDS generation: one based on the ponderomotive squeezing and one based on the Einstein Podolsky Rosen (EPR) quantum entanglement. The former, called SIPS (suspended interferometer for ponderomotive squeezing), is a small-scale interferometer with monolithic suspension of test masses designed to be sensitive to the radiation pressure in the detection band of GW detectors [3, 4, 6]. The latter aims at producing two squeezed EPR-entangled states that can be obtained by pumping an Optical Parametric Oscillator (OPO) cavity with a second harmonic detuned beam (see Dr. V. Sequino’s talk) [7]. EPR technique, before the implementation in large scale GW detectors such as Virgo, needs to be tested in an optical cavity achieving the radiation pressure noise limit. Therefore, SIPS turns out to be a suitable test bench for the EPR technique before the integration in Virgo [4, 7]. In this talk the status of the SIPS experiment and the design for the integration with the EPR experiment at the EGO (Virgo site) R&D squeezing laboratory will be presented.Bibliography:
[1] Acernese et al, Phys. Rev. Lett. 123, 231108 (2019)
[2] Acernese et al, Phys. Rev. Lett. 125, 131101 (2020)
[3] DiPace2020] Di Pace S et al, European Physical Journal D 74, 227 (2020)
[4] Di Pace S et al, Proceedings of the GRavitational-waves Science&technology Symposium (GRASS) 2019
[5] Di Pace S on behalf of the Virgo Co., Physica Scripta 96, 12, 124054 (2021)
[6] Giacoppo L, Di Pace S et al, Physica Scripta 96, 11, 114007 (2021)
[7] Sequino V, Di Pace S et al, EPR experiment for a broadband quantum noise reduction in GW detectors, Proceedings of the GWs Science & technology Symposium (GRASS) 2019
[8] [Sequino2021] Sequino V, Physica Scripta 96, 10, 104014 (2021)Speaker: Sibilla Di Pace -
192
Optimal control of a radiation pressure limited opto-mechanical resonator
The proposal of this work is the use of a highly sophisticated mechanical control for an optomechanical resonator, based on Pontryagin’s optimal control theory. The optomechanical device is a tabletop suspended interferometer designed to be radiation pressure limited in the frequency band of the ground-based gravitational waves detectors, to provide both a source of squeezed states by ponderomotive effect, for a broadband quantum noise reduction, and a suitable test bench for the optimal control algorithm we propose. The optimal control problem is analysed considering optomechanical interaction models already described in the literature. Indeed, a crucial point for this type of device is the mirror motion due to external mechanical disturbances, such as vibration and acoustic noise, which can bring the interferometer out of its working point. Moreover, the nonlinear optomechanical coupling generates the emergence of spurious frequencies in the reflected light spectrum, with respect to the monochromatic incoming laser spectrum.
The control force on the mirrors, operated by electromagnets, must be effective in reducing the noise and possible nonlinearities. To this aim, we will apply Pontryagin’s approach to develop an integro-differential model that can be used to build an adequate and optimized control system, which can be implemented and tested in our small-scale suspended interferometer.Speaker: Laura Giacoppo -
193
On the quantisation of electric charge
Quantization of electric charge is one of the biggest mysteries of modern physics. In 1931, Dirac showed that this observation could be explained if there exists magnetic monopoles. However, no magnetic monopoles have been located through experimental search. In this presentation, I shall propose an alternative proof of the quantization of electric charge, based on a non-relativistic semi-classical description of electrostatic fields. This model was presented in ICNFP 2020, to explain the non-locality problem of the Aharonov-Bohm effect and was subsequently published in Physica Scripta Vol. 96 084011 (2021).
Speaker: Kolahal Bhattacharya (Homi Bhabha Centre for Science Education)
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190
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Cosmology, Astrophysics, Gravity, Mathematical Physics Room 4
Room 4
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194
New SiPM technology for light detection in DarkSide-20k
DarkSide-20k is the nearest goal of the Global Argon Dark Matter
Collaboration program and will be operated in Hall C of Gran Sasso
National Laboratory. It consists of a multi-ton ultra-low
background dark matter detector, based on a dual phase Time Projection
Chamber filled with low radioactivity argon instrumented with cryogenic
photosensors. Among of the the key features of the experiment there are
the Silicon Photo Multiplier (SIPM) array configuration in compact large
area tiles integrated with the related front-end electronics in 20 x 20
cm2 Photo Detection Units that will cover more than 21m2
of the surface detector and the full scale production of 10000 tile modules
in the Nuova Officina Assergi (NOA), the 420 m2 clean room realized at
LNGS.. Here we will report a full SiPM characterization at 77K, the Photo Detection Unit design, assembly and performance and the status of the NOA facility.Speaker: Lucia Consiglio (INFN) -
195
The Sardinian site candidate to host the Einstein Telescope
Einstein Telescope (ET) will be the European third-generation of gravitational wave interferometer. In Sardinia, the region around the former mine of Sos Enattos (Lula, Nuoro), is one of the sites candidates to host this new experiment. The site satisfies the scientific requirements mainly concerning geology, environmental and seismic noise. In this talk, an overview of the ongoing activities related to the characterization of the site will be given. The seismic campaign, on the surface and underground into the mine and in two boreholes, has already shown the low seismic noise of the region that reaches the Peterson’s NLNM in a particular frequency range (2-20 Hz) important for ET. Close to the mine, a physics laboratory, the SarGrav laboratory, may host underground experiment, cryogenic payloads, low frequency and cryogenic sensors. SarGrav, with more than 900 square meters on the surface and some underground areas, already host a control room, an optical laboratory and different experimental areas for different sensors. Archimedes is the first fundamental physics experiment under installation at Sos Enattos. Its prototype, the most precise balance in the world, measured a seismic noise of the order of picoradiant in tilt, confirming the quality of the area as a candidate to host ET and the potentiality of the SarGrav Laboratory to test the ET prototype technologies.
Speaker: Davide Rozza (University of Sassari and INFN-LNS)
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194
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High Energy Particle Physics Room 4
Room 4
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196
Eco-friendly Resistive Plate Chamber detectors for HEP applications
Resistive Plate Chamber detectors are largely used in current High Energy Physics experiments given their excellent resolution in time and high resolution in space. They are typically operated in avalanche mode with large fractions of Tetrafluoroethane (C2H2F4), a gas recently banned by the European Union due to its high Global Warming Potential (GWP).
An intense R&D activity is ongoing to improve RPC technology in view of present and future HEP applications.
Since a few years a joint effort between the ALICE, ATLAS, CMS, LHCb/SHiP and CERN Communities is in place to search for potential eco-friendly gas mixtures and assess the performance of RPCs in different irradiation conditions. Test campaigns are in progress at the CERN Gamma Irradiation Facility (GIF++). In this talk, a review on the promising results of these studies and future plans will be given.Speaker: Alessandra Pastore (Universita e INFN, Bari (IT))
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196
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Heavy Ion Collisions and Critical Phenomena Room 1
Room 1
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197
Recent Heavy Ion Results from ATLAS
Recent results in heavy ion physics from ATLAS
Speaker: Martin Spousta (Charles University)
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197
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13:00
Lunch
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15:00
Coffee break
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20:00
Dinner
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High Energy Particle Physics Room 1
Room 1
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198
Multiquark states at LHCbSpeaker: Mr Zehua Xu (LPC Clermont CNRS/IN2P3 (FR))
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199
Multiquarks theorySpeaker: Marek Karliner (High Energy Physics Department)
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200
ATLAS results on exotic hadronic resonances
Recent results on exotic resonances obtained from the proton-proton collision data taken by the ATLAS experiment will be presented. A study of J/psi p resonances in the Lambda_b -> J/psi p K decays with large m(pK) invariant masses will be reported. Studies of Z_c states in B-meson decays with the Run 2 data at 13 TeV will be discussed. Searches for exotic resonances in 4 muon final states will also be detailed.
Speaker: Ivan Yeletskikh (Joint Institute for Nuclear Research (RU))
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198
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10:30
Coffee break
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High Energy Particle Physics Room 1
Room 1
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202
First results for searches of exotic decays with NA62 in beam-dump mode
We report on the search for visible decays of exotic mediators from data taken in "beam-dump" mode with the NA62 experiment. The NA62 experiment can be run as a "beam-dump experiment" by removing the Kaon production target and moving the upstream collimators into a "closed" position.
In 2021, more than 10^17 protons on target have been collected in this way during a week-long data-taking campaign by the NA62 experiment. Using past experience, the upstream beam-line magnets were configured to sizably reduce background induced by 'halo' muons.
We report on the analysis results of this data, with a particular emphasis on Dark Photon Models.Speaker: Stefan Alexandru Ghinescu (Horia Hulubei National Institute of Physics and Nuclear Engineering (RO)) -
203
Deeply Virtual Compton Scattering at COMPASS
We will present preliminary COMPASS results on the Deeply Virtual Compton Scattering (DVCS) cross section, which was obtained from exclusive single-photon production by scattering the 160 GeV muon beams of the SPS M2 beamline off a 2.5 m long liquid hydrogen target. The recoil proton was measured by a barrel-shaped time-of-flight detector surrounding the target. The scattered muons were detected by the COMPASS spectrometer and the photons by electromagnetic calorimeters including a new large-angle calorimeter. We will show the charge-spin average DVCS cross section differential in the squared four-momentum transfer to the proton, which is expected to be sensitive to the transverse extension of partons in the proton. COMPASS allows first access to the Bjorken-x domain of sea quarks.
Speaker: Anatolii Koval (National Centre for Nuclear Research (PL)) -
204
Current Status and Prospects of JUNO
The Jiangmen Underground Neutrino Observatory (JUNO) is a medium-baseline reactor neutrino experiment currently under construction in southern China. $20\,\mathrm{kton}$ LAB-based liquid scintillator target is contained inside the Central Detector, a $35.4\,\mathrm{m}$ diameter spherical acrylic vessel. The scintillator light emitted from the Central Detector will be read out by the surrounding $17612 \,\,20”$ and $25600\,\, 3”$ photo-multiplier tubes, which are submerged inside a $40\,\mathrm{m}$ diameter cylindrical water pool acting as an active shielding detector. The main goal of JUNO will be the determination of the neutrino mass ordering at a statistical significance of about $3\,\sigma$ within $6 \,\mathrm{years}$ of data-taking using electron anti-neutrinos produced in two nuclear power plants at a distance of $\sim52.5 \,\mathrm{km}$. To achieve this, JUNO aims for an unprecedented $3\,\%$ energy resolution at $1 \,\mathrm{MeV}$. This resolution together with the detector’s low energy threshold will enable a broad physics program including the observation of solar neutrinos, geo-neutrinos, neutrinos from a close by core-collapse supernova and the diffuse supernovae neutrino background as well as competitive sensitivity to proton decay. Additionally, JUNO will be able to determine the neutrino oscillation parameters $\sin^2(θ_{12}),\, \Delta m_{21}^2$ and $\Delta m_{31}^2$ at the sub-percent level. The talk will present the design of the experiment, its status and its physics prospects.
Speaker: Konstantin Schweizer (Technical University Munich)
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205
Closing of ICNFP 2022, Announcement of ICNFP 2023 Room 1
Room 1
Speaker: Organizing Committee -
13:00
Lunch
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15:00
Coffee break
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20:00
Dinner
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08:00
Departures
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08:00
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Heavy Ion Collisions and Critical Phenomena Room 1
Room 1
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206
PHENIX results on identified hadron production in small and large collision systems
Quark-gluon plasma (QGP) is a state of matter which exists at extremely high temperatures and densities. Formation of QGP in collisions of heavy relativistic nuclei was predicted by quantum chromodynamics (QCD) and proved by experimental observation of QGP signatures.
One of such signatures is enhancement of baryon production over meson production. This effect was firstly observed by PHENIX experiment in Au+Au collisions and successfully explained in the frame of recombination models of QGP hadronization.
According to QCD in small collision systems conditions are not sufficient for QGP formation. However PHENIX experiment obtained evidences of QGP formation in p/d/He+Au collisions. Therefore comparison of charged hadron production in small and large collision systems allows to study the minimal conditions of QGP formation and to investigate dependence of particle production on collision geometry and number of participants.
This talk will present recent PHENIX results on identified hadron production in p+Al, p+Au, He+Au, Cu+Au collisions at the energy of 200 and in U+U collisions at the energy of 193 GeV. Features of recombination mechanism of hadronization in small and large collision systems will be discussed.Speaker: Daria Larionova -
207
Azimuthal anisotropy of strange and multi-strange hadrons in isobar collisions at $\sqrt{s_{\mathrm {NN}}}$ = 200~GeV}
The relativistic heavy-ion collisions aim to create the matter under high temperature and high density, called Quark-Gluon Plasma, and study its properties. Strange and multi-strange hadrons have a smaller hadronic cross-section than light hadrons, making them a better probe for comprehending the early stages of relativistic heavy-ion collisions. In 2018, isobar collisions, $^{96}_{44}$Ru+$^{96}_{44}$Ru and $^{96}_{40}$Zr+$^{96}_{40}$Zr, at $\sqrt{s_{\mathrm {NN}}}$ = 200 GeV have been performed at RHIC. These collisions are considered to be efficient in reducing the flow-driven background contribution in search for the Chiral Magnetic Effect (CME). Flow measurements are quite sensitive to the different deformation characteristics between the two species. A comprehensive elliptic flow measurements of strange hadrons give direct information about the initial spatial anisotropies and help to understand the CME background. The collected datasets include approximately two billion events for each of the isobar species and provide a unique opportunity for statistics hungry measurements.
In this talk, we will present the elliptic flow ($v_{2}$) of $K_{s}^{0}$, $\Lambda$, $\bar{\Lambda}$, $\phi$, $\Xi^{-}$, and $\overline{\Xi}^{+}$, at mid-rapidity (|y| $<$ 1.0) for Ru+Ru and Zr+Zr collisions at $\sqrt{s_{\mathrm {NN}}}$ = 200 GeV. The measurement of $v_{2}$ as a function of centrality and transverse momentum ($p_{T}$ ) will be discussed. The system size dependence of $v_{2}$ with different colliding systems such as Cu+Cu, Au+Au, and U+U will be presented. In addition, the physics implications of such measurements in the context of nuclear deformation in isobars will be also highlighted.Speaker: Ms Priyanshi Sinha (Indian Institute of Science Education and Research (IISER) Tirupati) -
208
Elliptic flow of light (anti-)nuclei in Au+Au collisions at $\sqrt{s_{NN}}$ = 14.6, 19.6, 27, and 54.4 GeV using the STAR detector
The production of light nuclei in relativistic heavy-ion collisions is usually described by the thermal model and the coalescence model. The thermal model suggests that the light nuclei are emitted by a source in local thermal equilibrium with other hadrons and their yields are fixed at chemical freeze-out. However, given that the binding energies of light nuclei are only of the order of a few MeV, it is more likely that they are formed at a later stage by the final-state coalescence of protons and neutrons near the kinetic freeze-out surface. The final-state coalescence of nucleons will lead to the mass number scaling of the elliptic flow of light nuclei. This scaling states that the elliptic flow of light nuclei scaled by their respective mass numbers will follow very closely the elliptic flow of nucleons. Therefore, studying the elliptic flow of light nuclei will help us in understanding their production mechanism.
In this talk, we will present the transverse momentum ($p_{T}$) and centrality dependence of elliptic flow ($v_2$) of $d$, $t$, and $^3\text{He}$ and their antiparticles in Au+Au collisions at $\sqrt{s_{NN}}$ = 14.6, 19.6, 27, and 54.4 GeV from the Beam Energy Scan phase II. Mass number scaling of $v_2(p_T)$ of light (anti-)nuclei will be shown. In addition, $v_2(p_T)$ of light (anti-)nuclei will be compared with the AMPT model with nucleon coalescence.
Speaker: Rishabh Sharma (Indian Institute of Science Education and Research (IISER) Tirupati)
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206
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High Energy Particle Physics Room 2
Room 2
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209
ATLAS results on exotic hadronic resonances
Results of the ATLAS experiment on the exotic hadrons are presented. Studies of pentaquark and tetraquark states in B-hadron decays and recent results on the signals of resonant $J/\psi$-pair production are reviewed. Perspectives for future and ongoing analyses of exotic states are highlighted.
Speaker: Ivan Yeletskikh (Joint Institute for Nuclear Research (RU)) -
210
Kaonic atoms research at the DAFNE Collider: SIDDHARTA-2 and future
The low-energy QCD, the theory within the Standard Model describing the strong interaction, is still missing fundamental experimental results in order to achieve a breakthrough in its understanding. Among these experimental results, the low-energy kaon-nucleon/nuclei interaction studies are playing a key-role, with important consequences going from particle and nuclear physics to astrophysics (neutron stars).
Combining the excellent quality kaon beam delivered by the DANE collider in Frascati (Italy) with new experimental techniques, as fast and very precise X ray detectors, like the Silicon Drift Detectors, we have performed unprecedented measurements in the low-energy strangeness sector in the framework of the SIDDHARTA Collaboration and are presently running the SIDDHARTA-2 experiment for the challenging kaonic deuterium measurement.
I shall introduce the physics of kaonic atoms, the present experiment with its preliminary results, and future opportunities.
The experiments at the DANE collider represents an opportunity unique in the world to, finally, unlock the secrets of the QCD in the strangeness sector and contribute to better understand the role of strangeness in the Universe, from nuclei to the stars.Speaker: Luca De Paolis -
211
Open heavy flavor production at RHIC
Open heavy flavor production at RHIC
Speaker: Sonia Kabana (Instituto De Alta Investigación - Universidad de Tarapacá (CL))
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209
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Multidisciplinary Session Room 3
Room 3
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212
N Spectroscopy with hCQM and correction terms
The light and strange baryon sector has always been of keen interest to study the dynamics of composite quarks and relevant degrees of freedom leading to the observed properties. Many relativistic, semi-relativistic, and non-relativistic approaches have attempted to study the excited baryon spectrum. Earlier in the octet, decuplet baryons starting from N to Ω have been studied using hypercentral Constituent Quark Model (hCQM) with a linear confining term along with the Coulomb-like term in the non-relativistic framework. However, the required hyperfine splitting could not be achieved using that potential term. Here, we have incorporated first and second-order correction terms for mass and spin-dependent potential term to account for all possible spin-parity states. The results have been obtained for N and Δ baryons. This is expected to refine the known results and aid in future observations at various experiments dedicated towards the study of light, strange baryons namely PANDA at FAIR-GSI.
Speaker: Ms Chandni Menapara (Sardar Vallabhbhai National Institute of Technology Surat.) -
213
Estimation of spins of 193Pb Superdeformed Band
we have analyzed all the known and unknown superdeformed (SD) bands in 193Pb using the modified Variable Moment of Inertia (VMI) model to obtain the values of unknown band-head spin (I0) along with the level spins. The band-head spin so estimated is not known experimentally in bands 7, 8 and 9. A total of 9 experimentally known SD bands of 193Pb have been analyzed. A quantitatively good result of the γ-energies and the spins for the entire Pb band is successfully obtained. We also examine the ratio of transition energies over spin Eγ/2I (RTEOS) to confirm the correct spin of the band-head and level spins by the VMI equations. The calculated and observed transition energies are in well agreement. In the present paper, we have reported the band-head spin for the 193Pb (b7-b9) superdeformed band. Out of the available 9 SD bands, the band-head spin is predicted for 3 SD bands, where the band-head spins are not known experimentally. As an important outcome of our study, we propose the spin assignments and level energies of the 193Pb (b7-b9). We resolve the tentative nature of the assignments and present the unique level schemes. These results may be useful for the future studies.
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214
Characterization of quasi-periodic dynamics of a magnetic nanoparticle
In this work, we study the dynamical behavior of a uniaxial anisotropic magnetic particle under the action of an external time-varying magnetic field using the Landau-Lifshitz-Gilbert approach. Specifically, we investigate the system response as a function of its characteristic parameters with particular emphasis on dissipation and anisotropy. We explore the Lyapunov spectrum to characterize multiple transitions among periodic, quasi-periodic, and chaotic regimes. We found that the anisotropy produces asymmetry in the dynamical states, showing different behaviors for the hard and easy anisotropy axes. Furthermore, we observe that there are code bar type transitions among chaotic and quasi-periodic states as a function of the magnetic field when the dissipation is small, whereas when the dissipation increases, periodic states appear. For these regular states, the periodicity distribution as well as the period are computed using the isospikes technique and Fourier spectrum, respectively.
Speaker: David Laroze
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212
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15:00
Coffee break
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Heavy Ion Collisions and Critical Phenomena Room 1
Room 1
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215
Elliptic flow of hadrons in relativistic heavy-ion collisions using the PHSD model
Quantum Chromodynamics (QCD) predicts that at sufficiently high-temperature (T) and/or baryon chemical potential ($\mu_{B}$), normal nuclear matter converts into a de-confined state of quarks and gluons, known as Quark-Gluon Plasma (QGP). A hot and dense medium of quarks and gluons is created in relativistic heavy-ion collisions. The dynamics and collective behavior of such strongly interacting medium have been extensively studied by measuring azimuthal anisotropy of the produced particles defined by the Fourier coefficients relative to the reaction plane. The mass ordering of elliptic flow at low $p_{T}$ region among various hadron species has been observed, which reflects the hydrodynamic evolution of the medium. Number-of-constituent-quark (NCQ) scaling at intermediate $p_{T}$ suggests the collective motion of quarks before hadronization.
In this work, we report elliptic flow measurements of inclusive and identified charged hadrons at mid-rapidity ($|y| <$ 1.0) in Au+Au collisions at $E_{lab} =$ 35 A GeV ($\sqrt{s_{NN}} \sim$ 8 GeV) using the Parton-Hadron-String-Dynamics (PHSD) model. These results are the prediction at one of the beam energy ($E_{lab} =$ 35 A GeV) for the CBM experiment at FAIR. The measurements are compared with the published results from the STAR experiment at RHIC for Au+Au collisions at $\sqrt{s_{NN}} =$ 7.7 GeV. We will present the centrality and $p_{T}$ dependence of the elliptic flow ($v_{2}$). The NCQ scaling of identified hadron $v_{2}$ in Au+Au collisions will be discussed. We will also discuss the ratio of $v_{2}$ scaled by the participant eccentricity ($\varepsilon_{2part}$) to explore partonic collectivity of the medium produced in heavy-ion collisions.
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216
The charge balance function with HYDJET++ model in heavy ion collisions at LHC
The data on charge balance function in Pb+Pb collisions at center-of-mass energy 2.76 TeV per nucleon pair are analyzed with the HYDJET++ model. For central collisions the width of the charge balance function at low transverse momentum intervals is larger in the model than in data both in relative pseudorapidity and relative azimuthal angle. An approach which takes into account the event-by-event charge conservation have been implemented into the thermal part of the model at the stage of hadron production. This approach implies two particle charge correlations with a certain length and allows to reproduce experimental widths.
Speaker: Gyulnara Eyyubova (M.V. Lomonosov Moscow State University (RU)) -
217
Probing local parity violation in strong interaction via CMW measurement using the ALICE detector in Pb--Pb collisions
In heavy-ion collisions, a strong magnetic field ($\sim$ 10$^{15}$ T) is expected to be created, which together with the presence of a non-zero vector and axial currents gives rise to a collective excitation in the quark--gluon plasma (QGP) called the Chiral Magnetic Wave (CMW). The experimental signature of the CMW is charge-dependent elliptic flow, $v_{2}$. In particular, the normalized difference of $v_{2}$ of positive and negative charges, ($\Delta v_{2_{\mathrm{Norm}}}$), may exhibit a positive slope as a function of the asymmetry ($A_{\mathrm{ch}}$) in the number of positively and negatively charged particles in an event. However, non-CMW mechanisms such as Local Charge Conservation (LCC) intertwined with collective flow can also lead to a similar dependence of $v_{2_{\mathrm{Norm}}}$ on $A_{\mathrm{ch}}$. A similar measurement with triangular flow $v_{3}$ can provide an estimate of the effect of LCC as we expect it not to be affected by the CMW.
In this talk, ALICE measurement of $v_{2}$, $\Delta v_{2_{\mathrm{Norm}}}$, $v_{3}$ and $\Delta v_{3_{\rm{Norm}}}$ of inclusive and identified hadrons as a function of $A_{\mathrm{ch}}$ in Pb--Pb collisions will be presented. Finite slope parameters corresponding to $v_{2_{\mathrm{Norm}}}$ and $v_{3_{\mathrm{Norm}}}$ versus $A_{\mathrm{ch}}$ are measured as a function of collision centrality and compared with results from other experiments and models. In addition, the Event Shape Engineering technique is adopted for the first time to quantitatively distinguish the CMW signal and the LCC background.
Speaker: Prottay Das (National Institute of Science Education and Research (NISER) (IN)) -
218
Higher-order event-by-event mean-$p_\mathrm{T}$ fluctuations in pp and A--A collisions with ALICE
The study of event-by-event mean transverse momentum ($p_\mathrm{T}$) fluctuations is a useful tool to understand the dynamics of the system produced in ultrarelativistic heavy-ion collisions. The measurement of higher-order fluctuations of mean-$p_\mathrm{T}$ can help in probing the hydrodynamic behavior of the system and is considered to be a direct way of observing initial-state fluctuations. It can also be sensitive to the early-time evolution of the produced quark-gluon plasma.
We present the first measurement of three- and four-particle $p_\mathrm{T}$ correlators and their intensive ratios, related to the skewness and kurtosis of event-by-event mean-$p_\mathrm{T}$ distribution, as a function of average charged-particle density in Pb--Pb collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV and Xe--Xe collisions at $\sqrt{s_\mathrm{NN}}$ = 5.44 TeV using the data recorded by the ALICE detector. For the baseline study, the analysis is performed also in pp collisions at $\sqrt{s}$ = 5.02 TeV. The measurements are compared to corresponding results from the STAR experiment at lower collision energies and to different theoretical model predictions.
Speaker: Swati Saha (National Institute of Science Education and Research (NISER) (IN))
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215
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Heavy Ion Collisions and Critical Phenomena Room 3
Room 3
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219
Event-by-event multiplicity fluctuations in Pb$-$Pb collisions at 2.76 TeV with ALICE at LHC
Local multiplicity fluctuations are a useful tool to understand the dynamics of the particle production and the phase-space changes from quarks to hadrons in ultrarelativistic heavy-ion collisions. The study of scaling behavior of multiplicity fluctuations in geometrical configurations in multiparticle production can be done using the factorial moments and recognized in terms of a phenomenon referred to as intermittency.
In this contribution, we present the first factorial moment analysis performed on the multiplicity distributions of charged particles produced in the Pb$-$Pb collisions at $\sqrt{s_{\rm{NN}}}$ = 2.76 TeV, recorded with the ALICE detector at the LHC. The normalized factorial moments (NFM), $F_{q}$ of the spatial configurations of charged particles in two-dimensional angular ($\eta,\varphi$) phase space are calculated. For a system with dynamic fluctuations due to the characteristic critical behaviour near the phase transition, $F_{q}$ exhibits power-law growth with increasing bin number or decreasing bin size which indicates self-similar fluctuations. Relating the $q^{\rm{th}}$ order NFM ($F_{q}$) to the second-order NFM ($F_{2}$), the value of the scaling exponent ($\nu$) is extracted, which indicates the order of the phase transition within the framework of Ginzburg-Landau theory. The dependence of scaling exponent on the $p_{\rm{T}}$ bin width and the centrality of the events will be presented. The measurements are compared with the corresponding results from the AMPT, HIJING and Toy Monte Carlo models.
Speaker: Sheetal Sharma (University of Jammu (IN)) -
220
Computation of the rates of bottomonium dissociation and recombination in heavy-ion collisions at 5.02 TeV.
In the medium of relativistic heavy-ion collisions, dissociation of the
quarkonium and their survival have been studied to understand the properties of Quark Gluon Plasma (QGP). The coupled rates of dissociation and recombination reactions in QGP are commonly solved with
Boltzmann transport equation in which the formation and dissociation
reactions compete. Since the dissociation of newly formed bound-states
are not accounted in the Boltzmann equation, a framework of decoupled rates is developed to assess the combined effect of gluon-induced
dissociation and recombination together with color screening on bottomonium production at center of mass energy (√s) = 5.02 TeV
in heavy-ion collisions (Pb+Pb ions). To calculate the recombination
rate equation, we have employed an effective method of Bateman solution which makes sure the regeneration along with the dissociation of
the recombined bottomonium in the QGP medium. The modifications
of bottomonium have been estimated in an inflating QGP with the constraints agreeing with the dynamics of Pb+Pb collision events at LHC.Speaker: Abdullah Abdulsalam (King Abdulaziz University, Jeddah)
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219
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High Energy Particle Physics Room 2
Room 2
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221
Exotic Decays of Higgs Boson to Light Long-Lived Mediators at HL-LHC, FCC-hh and a Proposal of Dedicated LLP Detectors for FCC-hh
We study the pair production of the long-lived mediator particles from
the decay of the SM Higgs boson and their subsequent decay into standard model particles. We compute the projected sensitivity, both model-independently and with a minimal model, of using the muon spectrometer of the CMS detector at the HL-LHC experiment for ggF, VBF, and Vh production modes of the Higgs boson and various decay modes of the mediator particle, along with dedicated detectors for LLP searches like CODEX-b and MATHUSLA. Subsequently, we study the improvement with the FCC-hh detector at the 100 TeV collider experiment for such long-lived mediators, again focusing on the muon spectrometer. We propose dedicated LLP detector designs for the 100 TeV collider experiment, DELIGHT (Detector for long-lived particles at high energy of 100 TeV), and study their sensitivities.Speaker: Rhitaja Sengupta
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Cosmology, Astrophysics, Gravity, Mathematical Physics Room 2
Room 2
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222
Does the Weyl invariant based proposal provide an accurate description of gravitational entropy?
The evolution of the universe is described by the second law of thermodynamics, which states that the entropy at a point farther in time would have a greater entropy than that of a point in time earlier. The usual description of entropy is by thermodynamic information, where the universe at a time very close to the initial singularity is homogeneous and therefore of a lower entropy state. As time progresses, structure formations increase, which imply an increasing entropy. A geometric description of this was proposed by Penrose, who looked for an account of gravitational clumping in terms of the Weyl curvature, in the Weyl curvature hypothesis. This hypothesised that the increasing entropy of the universe can be described as the increasing Weyl curvature, starting from zero at the initial singularity, and eventually tidal distortions increase due to clumping of matter due to gravitation, and structure formations account for the increasing anisotropies. In this talk, we look at gravitational entropy briefly, looking at the conditions such a proposal should satisfy, and some examples of where this proposal reduces to the familiar entropy and where this proposal requires further investigation.
Speaker: Vaibhav Kalvakota
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Cosmology, Astrophysics, Gravity, Mathematical Physics Room 3
Room 3
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223
Results and Prospects of the Hellenic Open University air shower array
Astroneu is an array of autonomous Extensive Air Shower detection stations deployed at the Hellenic Open University (HOU) campus on the outskirts of Patras in western Greece. In the first phase of operation 9 scintillators detectors and 3 Radio Frequency (RF) antennas have been installed and operated at the site. The detector units were arranged in three autonomous stations each consisting of three scintillator detectors (SDM) and one RF antenna. In the second phase of operation 3 more antennas were deployed at one station in order to study the correlation of the RF signals from 4 antennas subject to the same shower event. In this report we present the standard offline SDM-RF data and simulations analysis, the main research results concerning the reconstruction of the EAS parameters as well as the prospects of a new compact array that will be deployed by 2023.
Speaker: Dr Stavros Nonis (Hellenic Open University) -
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The Tadpole Problem
The fluxes that stabilize the complex-structure moduli of string compactifications give rise to a nontrivial D3 charge, which needs to be canceled by other objects in the compactification. I will present arguments that this is impossible when the number of complex-structure moduli is large. This indicates that all String-Theory compactifications on manifolds with a large number of complex-structure moduli have massless scalars and hence are not suited for phenomenology.
Speaker: Iosif Bena -
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Early Universe Quark-Hadron Transition Using a Phenomenological Quasi-Particle Model
Our aims to study the quark-gluon plasma (QGP), theorised to
have been present during the early and expanding stages of our universe. Through the equations of state (EoS) of temperature, pressure and energy density, we can understand more about the evolution of the early universe QGP. The Friedmann equations (derived from the Einstein field equations) are solved by utilising a phenomenological quasi-particle model, where we take into consideration the effective quark mass incorporating the current mass and the thermal mass of the quasi-particles, which are the thermal excitations generated due to the interactions between the quarks and gluons. The results are interesting and significant in the early universe of quark gluon plasma.Speaker: Yogesh Kumar
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High Energy Particle Physics Room 2
Room 2
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Low energy neutrinos in Super-Kamiokande
The Super-Kamiokande (SK) experiment is a 50 kton water Cherenkov detector located in the Kamioka Observatory in Japan and in operation since 1996, observing neutrinos and anti-neutrinos from many different sources. In 2020, SK moved to the SK-Gd phase, in which gadolinium sulfate octahydrate was added to the water in the detector to improve the detection efficiency of neutrons. Such neutrons identify inverse beta reactions of low energy electron anti-neutrinos. We report an overview of the recent results of low energy neutrino analyses in SK such as solar neutrinos, supernova neutrinos, and supernova relic neutrinos, as well as the achieved improvements and prospects after the gadolinium loading.
Speaker: Lucas Nascimento Machado (University of Naples/INFN Naples) -
227
SUSY (CMS)
The search for new physics such as supersymmetry (SUSY) and other beyond-the-standard-model physics is a major goal of the LHC physics program. The talk will cover the most recent results of SUSY searches using 137 fb$^{-1}$ data collected in 2016-2018 with the CMS detector at the LHC.
Speaker: Tribeni Mishra (National Institute of Science Education and Research (NISER) (IN))
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Cosmology, Astrophysics, Gravity, Mathematical Physics Room 1
Room 1
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228
Entropy of an Unruh source and Schwarzschild black hole
A Schwarzschild black hole is simulated by a set of Unruh particle sources. The approach allows to calculate the ratio of Unruh radiation to the Bekenstein-Hawking entropy analytically. The contribution of mass and spin of the emitted particles to total entropy is taken into account.
Speaker: Maksym Teslyk
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228
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Physics Education and Outreach Room 2
Room 2
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"PER (Particle Escape Room) me si va ne la fisica recente"
We propose the experience “PER (Particle Escape Room) me si va ne la fisica recente”, designed by the outreach group “Physics4Teenagers” working at the Physics Department of the University of Pavia. Thanks to the combination of entertainment and learning goals, the educational escape room format has acquired great visibility in the last decades. The activity is a journey through the history of particle physics from the atomic theory of Democritus to the discovery of the Higgs boson, which completes the Standard Model. Then the questions that remain unsolved, such as the problem of dark matter, neutrinos masses, and unification of forces, are explained.
This experience was designed for the “Festival della Scienza” in Genoa at the end of October 2021 and, following its great success, has been proposed to high school students and teachers on other occasions during 2022.
The results of the satisfaction questionnaire confirm the suitability of the format and the effectiveness of the friendly and informal attitude.
With this contribution we will discuss details of the activity and results, mentioning future installations and possible improvements.Speaker: Simone Venturini (University of Pavia, INFN Pavia)
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Cosmology, Astrophysics, Gravity, Mathematical Physics Room 2
Room 2
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230
Approaching the Einstein’s everlasting dream; unification of general relativity and quantum mechanics
General Relativity (GR) and Quantum Mechanics (QM) are fundamentally different theories explaining how nature works but with genuinely incompatible descriptions of reality. While GR handles gravitational force, at large scale, QM is the theory for the other fundamental forces of nature, at low scale. Events in GR happen continuously with deterministic outcomes. In QM, they happen in jumps with probabilistic outcomes. GR sees objects as point particles in continuous spacetime fabric. These are wave functions in QM. The measurements in GR are noncoherent and certain. Due to noncommutation relations in QM, the measurements are coherent with uncertainties. Based on the existence of a minimum measurable length emerging from string theory, doubly special relativity and black hole physics, the noncommutative Heisenberg algebra is generalized and thereby the gravitational fields are integrated to this fundamental theory of QM. I shall be discussing scientific results for the simultaneous GR quantization and QM gravitization, that the mutual unification would be possible at extreme conditions.
Speaker: Abdel Nasser Tawfik (ENHEP Egyptian Network of High Energy Physics (EG))
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230
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High Energy Particle Physics Room 3
Room 3
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231
Investigating diphoton mass sprectrum from quark gluon plasma
We study one of the important signature of quark gluon plasma (QGP) that is electromagnetic probes. The electromagnetic probes as diphotons are considered as a best signals for the formation and evolution of QGP.
We investigated diphoton production rate using a phenomenological model with quasiparticle approach at higher temperatures above critical temperature. In this, we use effective quark mass in place of thermal dependent quark mass to show the behaviour of diphoton mass spectrum. The results of diphoton with effective quark mass are very much similar to the results produced in the presence of thermal quark mass. Therefore our results are not invalidate with the effective quark mass.Speakers: Mr Gaurang Kuksal (Deshbandhu College, University of Delhi), Yogesh Kumar
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17:20
Coffee Break Room 1
Room 1
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Poster Session Room 1
Room 1
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232
Effect of Chemical Potential on the Early Universe Expansion of Quark Gluon Plasma
In this study, we investigate the effects of introducing a chemical potential in the expansion of early universe Quark Gluon Plasma (QGP). We use a quasi-particle approach in which we consider a temperature dependent quark-mass. We then proceed to solve the Friedman equation to obtain the equation of state of energy density and temperature, the graphs of which are shown in the results section. The study of the change of energy density and temperature of QGP with time is important to understand its evolution in the early stages of universe, which is useful for studies in cosmology and high energy astrophysics
Speakers: Mr Ritwik Sharma (Deshbandhu College, University of Delhi), Yogesh Kumar -
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Exotic hadron predictions in heavy ion collisionsSpeaker: Sonia Kabana (Instituto De Alta Investigación - Universidad de Tarapacá (CL))
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Dark photon searches (TBC)Speakers: Sonia Kabana (Instituto De Alta Investigación - Universidad de Tarapacá (CL)), for the BESIII Collaboration
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TBASpeaker: Amit Prabhat
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232
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