Measurements of single W and Z boson inclusive and differential production cross sections and their ratios with the CMS detector are presented. The results are compared to predictions from different Monte Carlo generators. A comparison of the results to predictions using different pardon distribution functions (PDF) tests the performance of PDFs.
In 2016 the LHCf experiment has fulfilled its original goal of measuring the spectra of the neutral particles produced in the very forward direction at LHC at the highest energy ever available. The main purpose of these measurements is indeed to provide the Cosmic Ray and High Energy Physics communities with a missing unique set of information for the improvement of the hadronic interaction...
The latest results on the measurement of the Higgs boson couplings and properties in the diphoton, ZZ and WW decay channels with the ATLAS detector are presented, using approximately 36 fb-1 of pp collision data collected at 13 TeV.
The study of identified particle production as a function of the proton-proton (pp) collision energy and multiplicity is a key tool for understanding similarities and differences between small and large interacting systems. We report on new measurements of the production of unidentified charged hadrons as well as of pions, kaons, protons, K$^{0}_{\rm S}$, $\Lambda$, $\Xi$, $\Omega$, K$^{*0}$...
Present status of the major problems in neutrino physics is outlined. New approaches to their solutions, recent advances and developments will be reviewed. Landscape of the problems covers complete reconstruction of the neutrino mass and mixing spectrum, tests of nature of neutrino masses, searches for new physics beyond the SnuM, identification of the mechanism of neutrino mass and mixing...
Quarkonium has been regarded as one of the golden probes to identify the phase transition from confined hadronic matter to the deconfined quark-gluon plasma (QGP) in heavy-ion collisions. Recent theoretical developments in the study of the J/ψ and ϒ families at the energies of Large Hadron Collider (LHC) are reviewed. In particular, the possible implications related to the production and...
LHCb experiment at CERN has recently reported a set of measurements on lepton flavour universality in b to s transitions showing a departure from the Standard Model predictions. I will review the main ideas recently put forward to make sense out of these intriguing hints. Focusing on the new physics explanation, I will discuss the correlated signals expected in other low- and high- energy...
Weakly Interacting Massive Particles (WIMPs) are one of the best motivated elementary particle candidates for dark matter. WIMPs could be detected via their scattering off matter, in so-called direct detection experiments. During the past decade, the sensitivity of such experiments has improved by three to four orders of magnitude, but solid evidence for their existence is yet to come. In this...
The Phase I upgrade of the CMS pixel detector, installed by the CMS collaboration during the recent extended end-of-year technical stop, is built out of four barrel layers (BPIX) and three forward disks in each endcap (FPIX). It comprises a total of 124M pixel channels, in 1,856 modules and it is designed to withstand instantaneous luminosities of up to 2 x 10^34 cm-2 s-1 with increased...
Measurements of the Drell-Yan production of W and Z/gamma bosons at the LHC provide a benchmark of our understanding of perturbative QCD and probe the proton structure in a unique way. The ATLAS collaboration has performed new high precision measurements at center-of-mass energies of 7. The measurements are performed for W+, W- and Z/gamma bosons integrated and as a function of the boson or...
The measurements of dilepton and diphoton production in photon-photon fusion with the CMS-TOTEM Precision Proton Spectrometer (CT-PPS) are presented. For the first time, exclusive dilepton production at high masses have been observed in the CMS detector while one or two outgoing protons are measured in CT-PPS using around 10~${\rm fb}^{-1}$ of data accumulated in 2016 during high-luminosity...
The studies on the properties of Higgs boson in H->ZZ->4l (l = e, μ) and H->WW->eνμν decay channels based on the data collected with the CMS experiment in Run2 are presented. The reported results include studies of the Higgs boson production modes using H->ZZ and H->WW decay channels, as well as measurements of the Higgs boson mass, signal strength, fiducial differential cross sections for its...
In this talk we present our results on production of heavy quarkonia in $pA$ and $AA$ collisions in the color dipole approach. We analyze dynamics of quarkonium inside nuclear matter, and assess nuclear suppression due to shadowing and absorption, as well as consider novel multinucleon production mechanism. The contribution of this new mechanism explains why the measured nuclear effects remain...
The LHCb experiment has the unique possibility, among the LHC experiments, to be operated in fixed target mode, using its internal gas target SMOG. The excellent detector capabilities for vertexing, tracking and particle identification allow to measure exclusive particle production for collisions of protons on different nuclei at an energy scale of sqrt(sNN) ~ 100 GeV, providing valuable...
XENON1T is a dual-phase time-projection chamber, designed to detect dark matter particle interactions within a 2-ton liquid-xenon target with unprecedented sensitivity. The detector, located at the Laboratori Nazionale del Gran Sasso, has been fully operational since May 2016, including regular calibrations, background studies, and a continuously improving xenon purity. The ongoing acquisition...
Rare b-hadron decays, which proceed via flavour changing neutral current (FCNC) transitions, provide a powerful test of the Standard Model of particle physics. I will present a short review of recent results on rare FCNC transitions from the LHC experiments, and will discuss some interesting tensions that have started to appear between experimental measurements and the Standard Model...
The forward acceptance of LHCb, 2.0 < y < 5.0, provides a complementary reach to the general purpose detectors on LHC. LHCb measurements of the inelastic cross-section and related results will be presented, as well as a comparison to Run 1 results.
The cross-section for central exclusive production of J/psi and Psi(2S) mesons at 13 TeV is measured using the LHCb detector. Proton dissociative...
The Compact Muon Solenoid (CMS) is a multi-purpose detector constructed in order to study high-energy particle collisions in the Large Hadron Collider (LHC) at CERN. The all-silicon design of the tracking system of the CMS experiment provided excellent resolution for charged tracks and an efficient tagging of jets during Run1 and Run2 of LHC.
As CMS upgraded and installed the pixel detector...
ALICE is the LHC experiment dedicated to the study of high energy heavy-ion collisions, where the formation of a hot and dense strongly-interacting medium, a Quark-Gluon Plasma (QGP), is expected. Considerable theoretical and experimental efforts have been invested in the last 30 years to study the properties of the QGP. One of the signals of QGP formation is the suppression of quarkonia,...
The latest results of the measurement of the Higgs boson decaying into two photons with the full 2016 data will be presented. The analysis is performed using the dataset recorded by the CMS experiment at the LHC from pp collisions at centre-of-mass energies of 13 TeV corresponding to an integrated luminosity of 35.9 1/fb.
T2K is a long-baseline neutrino oscillation experiment taking data since
2010. A neutrino beam is produced at the J-PARC accelerator in Japan and is
sampled at a Near Detector complex 280 m from the
neutrino production point and at the far detector, Super-Kamiokande.
Beams predominantly composed of muon neutrinos or muon anti-neutrinos have been
produced by changing the currents in the...
Measuring the scattering of longitudinally-polarized vector bosons will represent a fundamental test of
Electroweak Symmetry Breaking.
In addition to the challenges provided by low rates and large backgrounds,
there are conceptual issues which remain unresolved for the definition of a suitable signal.
Since vector bosons are unstable and can only be observed through their decay products,
the...
High-energy space missions allow keeping watch over blazars, which are jet emitting astrophysical sources that can flare. They provide deep insights into the engine powered by supermassive black holes. However, having a blazar caught in a very bright flaring state is not easy requiring long surveys. The observation of such flaring events represents a goldmine for theoretical studies.
Such a...
Precision measurements of the Drell-Yan production of W and Z bosons at the LHC provide a benchmark of our understanding of perturbative QCD and electroweak processes and probe the proton structure in a unique way.
The ATLAS collaboration has performed a new precise triple differential cross-section measurement as a function of M(ll), dilepton rapidity and cosθ∗ defined in the Collins-Soper...
The NuMI Off-axis νe Appearance (NOvA) experiment is a two-detector, long-baseline neutrino oscillation experiment which addresses some of the main open questions in the neutrino sector through precision measurements of neutrino and antineutrino oscillations. NOvA uses the upgraded NuMI neutrino beam at the Fermi National Accelerator Laboratory and a highly active, finely segmented 14-kton far...
Low energy phenomena have been studied in detail at the LHC, providing important input for improving models of non-perturbative QCD effects. The ATLAS collaboration has performed several new measurements in this sector:
We present charged-particle distributions sensitive to the underlying event, measured by the ATLAS detector in proton-proton collisions at a centre-of-mass energy of 13 TeV. ...
The suppression of heavy quarkonia states in heavy-ion collisions is a phenomenon understood as a consequence of QGP formation in the hot, dense system formed in heavy-ion collisions at the LHC. In addition to hot matter effects in heavy-ion collisions , cold nuclear effects may also affect quarkonia production . Therefore, a full assessment requires detailed studies on the effects present in...
One of the fundamental properties of the Higgs boson, it's mass, is measured by way of studying the invariant mass of the 4l and diphoton decay channels with about 36fb-1 of data collected by the ATLAS experiments. Since in this channel the final state can be reconstructed as invariant mass peak with a good experimental resolution this measurement can be done in a model independent way and...
The tracking performance of the ATLAS detector relies critically on its 4-layer Pixel Detector, that has undergone significant hardware and software upgrades to meet the challenges imposed by the higher collision energy, pileup and luminosity that are being delivered by the Large Hadron Collider, with record breaking instantaneous luminosities of 1.3 x 10^34 cm-2 s-1 recently surpassed.
The...
Prompt neutrino fluxes are background for searches of astrophysical neutrinos at Very Large Volume Neutrino Telescopes. We present predictions for these fluxes, obtained by state-of-the-art QCD methods, and we discuss their uncertainties, in particular those related to our approximate knowledge of Parton Distribution Functions. We make use of the PROSA fit, the first fit appeared in literature...
Charmonium states, such as the J/$\psi$ and $\psi$(2S) mesons, are excellent probes of the deconfined state of matter, the Quark-Gluon Plasma (QGP). The understanding of charmonia production in PbPb collisions requires the inclusion of many phenomena, such as dissociation in the QGP and statistical recombination, on top of cold nuclear matter effects (modifications of nPDFs, initial-state...
We present an inclusive search for a Higgs boson with high transverse momentum decaying to a bottom-antibottom quark pair in pp collisions using the 2016 data sample corresponding to 35.9fb−1collected by the CMS experiment at LHC. High pT Higgs bosons candidates are reconstructed in a single jet with opening angle corresponding to R = 0.8 (AK8 jet). Jet substructure and dedicated b-tagging...
We present the measurements of forward-backward charge asymmetry $A_{FB} $ in
$p\bar{p}\rightarrow Z/\gamma^{*} \rightarrow \mu^+\mu^- $ events using $9.7 \ $fb$^{-1}$ of $ p\bar p$ data collected at $\sqrt s=1.96\ $TeV by the D0 detector at the Fermilab Tevatron collider. $A_{FB}$ is measured as a function of the invariant mass of the dimuon system to extract the effective weak mixing...
The OPERA experiment reached its main goal by proving the appearance of $\nu_\tau$ in the CNGS $\nu_\mu$ beam. A total sample of 5 candidates fulfilling the analysis defined in the proposal was detected with a S/B ratio of about ten allowing to reject the null hypothesis at 5.1 $\sigma$. The search has been extended to $\nu_\tau$-like interactions failing the kinematical analysis defined in...
We present recent results of diffractive and exclusive measurements with the CMS experiment.
It has been suggested by several astronomical observations that dark matter contributes 27 % to the overall energy density of our universe but no particle candidates have been observed yet. The CRESST experiment aims to directly detect dark matter particle elastically scattering off nuclei. The CRESST-II detector modules are based on CaWO4 crystals which are operated at mK temperatures. The...
The ATLAS trigger has been used very successfully for online event selection during the first part of the second LHC run (Run-2) in 2015/16 at a centre-of-mass energy of 13 TeV. The trigger system is composed of a hardware Level-1 trigger and a software-based high-level trigger. Events are selected based on physics signatures such as presence of energetic leptons, photons, jets or large...
We present four measurements of forward-backward charge asymmetry $A_{FB} $ in
$p\bar{p}\rightarrow Z/\gamma^{*} \rightarrow e^+ e^-/\mu^+\mu^- + X$ events using $\sim 10\ $fb$^{-1}$ of $ p\bar p$ data collected at $\sqrt s=1.96\ $TeV by the D0 and CDF detectors at the Fermilab Tevatron collider. $A_{FB}$ is measured as a function of the invariant mass of the dilepton system to extract the...
Two phase xenon time projection chambers have a number of attractive characteristics for their use in rare event searches. This is the case for the Large Underground Xenon (LUX) experiment, resulting in interesting new results. TPCs have been traditionally used in dark matter searches for nuclear recoils, and LUX reported the most sensitive limits to date for spin-independent and...
We suggest that the exclusive Higgs + light (or b) jet production at the LHC,
$pp \to h+j(j_b)$, is a rather sensitive probe
of the light-quarks Yukawa couplings and of new physics (NP) in the
Higgs-gluon $hgg$ and quark-gluon $qqg$ interactions.
We study the Higgs $p_T$ distribution in $pp \to h+j(j_b)$, employing non-differential observables
to probe the different types of NP relevant for...
The LHCb experiment has the unique property to study heavy-ion interactions in the forward region (2 < η < 5), in a kinematic region complementary to the general purpose detectors. The detector has excellent capabilities for reconstructing quarkonia down to zero pT. Notably, it can separate the prompt and displaced components. In pPb collisions, both forward and backward rapidities are covered...
The photoproduction of isolated photons has been measured using diffractive events recorded by the ZEUS detector at HERA. Cross sections are evaluated in the photon transverse-energy and pseudorapidity ranges 5 < $E_T^\gamma$ < 15 GeV and
−0.7 < $\eta^\gamma$ < 0.9, inclusively and also with a jet with transverse-energy and pseudorapidity in the ranges 4 < $E_T^{jet}$ < 35 GeV and −1.5 <...
Charmonium states play an important role as probes of the phase transition between hadronic and deconfined matter. In high-energy nucleus-nucleus collisions, where the formation of a plasma of quarks and gluons is expected, the charmonium production yields are modified by mechanisms as color screening and/or (re)combination of $\rm{c}$ and $\bar{\rm{c}}$ quarks. However, charmonium production...
We report on the status of the precision measurements of electroweak parameters with W and Z bosons with the CMS detector. The effective electroweak mixing angle sin^{2}_{\theta} is extracted by measuring the forward-backward asymmetry in dilepton events near the Z boson mass region. Experimental and theoretical challenges needed for a high-precision W boson mass measurement are reported using...
KLOE-2 at the e$^+$e$^-$ DA$\Phi$NE collider, is the main experiment of the INFN Laboratori Nazionali di Frascati (LNF) and is the first high-energy experiment using the GEM technology with a cylindrical geometry, a novel idea developed at LNF exploiting the kapton properties. The experiment is the continuation of KLOE, upgraded with state-of-the-art technology to improve its discovery...
The Reactor Experiment for Neutrino Oscillation (RENO) started data-taking from August, 2011 and has sucdessfully measured the smallest neutrino mixing angle θ_13 in 2012 using 220 days of data by observing the disappearance of reactor antineutrinos. Antineutrinos from the six reactors at Hanbit Nuclear Power Plant in Korea are detected and compared by the two identical detectors located in...
Quarkonia are mesons formed of either a charm and anti-charm quark pair ($\rm{J}/\psi$, $\psi(2S)$), or a beauty and anti-beauty quark pair ($\Upsilon$(1S), (2S) and (3S)). In high-energy hadronic collisions such as those delivered by the LHC between 2010 and 2016, quarkonium production results from the hard scattering of two gluons in a process which occurs very early in the collision...
Rare decays are flavour changing neutral current processes that allow sensitive searches for phenomena beyond the Standard Model (SM).
In the SM, rare decays are loop-suppressed and new particles in SM extensions can give significant contributions.
The very rare decay Bs->mumu is in addition helicity suppressed and constitutes a powerful probe for new (pseudo) scalar particles.
Of particular...
The latest results from CMS on the study of SM Higgs decaying to tau pair and search for SM Higgs decaying to bottom quarks will be discussed. These results are based on the analysis of p-p collisions at 13 TeV, collected from CMS in the year 2016.
The LUX-Zeplin (LZ) experiment is the most advanced next-generation direct detection experiment under construction to search for dark matter in the Universe. It contains a dual-phase liquid xenon time projection chamber with a total active mass of 7 tons. LZ is implementing various low background techniques to significantly reduce radioactive background and reach an unprecedented level of...
The DAMPE (DArk Matter Particle Explorer) satellite was launched on
December 17, 2015 and it is taking data from more than 18 months.
It is designed to probe the highest energy cosmic-ray accelerators and to study
the nature of dark matter thanks to its excellent tracking and
calorimetric performances in the measurements of electrons, gamma rays, protons and nuclei.
A report on the...
Nuclear reactor neutrinos were used on the first neutrino detection back in 1956. Since then our knowledge on neutrino physics haven't stopped broadening, and reactor neutrinos are still an important source of investigation. The Double Chooz (DC) is an experiment on neutrino oscillation based at Chooz nuclear power plant in France. Back in 2011 the DC collaboration reported an indication of...
The latest results on the measurement of the cross sections and couplings of the Higgs boson in the fermionic decay channels to bb, tautau and mumu with the ATLAS detector are presented, using approximately 36 fb-1 of pp collision data collected at 13 TeV.
Open heavy flavour hadron production is studied in pPb collisions at sqrt{s_{NN}}= 5 and 8 TeV with the LHCb experiment. The detector has excellent capabilities for particle identification and for the reconstruction of charm and beauty hadrons down to zero pT. Both forward and backward rapidities are covered thanks to the possibility of beam reversal. Results include measurements of the...
The SoLid short baseline reactor neutrino experiment consists of a highly segmented plastic scintillator detector with a fiducial mass of 2 ton. Its main purpose is to prove or rule out the existence of sterile neutrinos corresponding to $\delta_{M^2}$ values of order 1eV$^2$. The covered baseline ranges between 6 and 9 meters and is in-line with the compact core of the 60MW BR2 reactor of the...
Rare b->s(gamma,ll) decays are flavour changing neutral current processes that are forbidden at the lowest perturbative order in the Standard Model (SM).
As a consequence, new particles in SM extensions can significantly affect the branching fractions of these decays and give rise to new sources of CP-violation.
The LHCb experiment is ideally suited for the analysis of rare decays due to the...
The results obtained from the different decay channels are combined to study the properties of the Higgs boson production and decay, and test the SM theoretical precision with increased accuracy, using about 36 fb-1 of p-p collisions data collected at 13 TeV.
Produced in a hard scattering an energetic parton will lead to a parton shower which will be fragmenting into a hadronic spray of particles called jet. The mass of the jet is sensitive to the initial virtuality of the parton at the origin of the shower. The jet fragmentation functions and their moments, describe the momentum distribution of hadrons inside a reconstructed jet. Their measurement...
Lepton Flavor (Universality) Violation in B Meson Decays
Even though the LHC searches so far did not unveil the new physics particles, the B-physics experiments at LHCb, BaBar and Belle hint towards deviations from Lepton Flavor Universality in both the tree-level and loop-induced B meson semileptonic decays. I will briefly review the models that can address these puzzles, propose one new...
In ultra-relativistic heavy-ion collisions, creation of a novel state of matter—the quark-gluon plasma (QGP)—is expected. Studying the properties of this medium of deconfined quarks and gluons has been a focus of high energy nuclear physics and poses a significant experimental challenge. Among various probes, quarkonium production is a crucial one since their production is expected to be...
We review the status of the global electroweak fit in the Standard Model (SM), including the latest theoretical and experimental updates. We discuss in detail the consistency of the SM with current experimental data, and derive constraints on general new physics scenarios. These are compared and combined with the bounds obtained using Higgs boson observables measured at the LHC. Finally, we...
The NA62 experiment at CERN SPS aims to measure the Branching Ratio of the very rare kaon decay K+ -> pi+ nu nubar collecting ~100 events with a 10% background to make a stringent test of the Standard Model in two years of data taking.
The Calorimeter Level 0 Trigger is used to suppress one of the main backgrounds, the K+ -> pi+ pi0 decay, and to select events with a pi+ in the final...
The last solar cycle has presented a peculiarly long quiet phase with consequent minimum modulation conditions for cosmic rays. The proton and electron spectra were measured from July 2006 to December 2009 by PAMELA experiment, providing fundamental information about the transport and modulation of cosmic rays inside the heliosphere. These studies allow to obtain a more complete description...
The complementarity of direct, indirect and collider searches for dark matter has improved our understanding concerning the properties of the dark matter particle. We will review the basic concepts that these methods rely upon and highlight what are the most important information they provide when it comes down to interpret the results in terms of Weakly Interacting Massive Particles (WIMPs)....
Measurements of charmed-hadron production in pp collisions are important to test predictions from perturbative QCD and provide an essential baseline for the studies in A--A collisions. Measurements in p--A collisions also allow studies of possible modifications of the charmed-hadron yields due to cold nuclear matter effects. The study of charm production as a function of the multiplicity of...
Particles carrying heavy flavor are important probes of the properties of the Quark-Gluon Plasma (QGP) since they are produced in hard scattering during the earliest stages of nuclear collisions. In recent years, the PHENIX detector has collected data on p+p, p+Al, p+Au, He$^3$+Au, Cu+Au and Au+Au collisions at $\sqrt{s_{NN}}$=200GeV with the addition of silicon vertex detectors (VTX and...
Nuclear astrophysics is an extremely rich field, correlated with many other research fields like observational neutrino physics, stellar modeling and cosmology.
As example, the precise knowledge of reactions producing neutrinos is mandatory to use neutrinos as probes of the stellar interior but at stellar energies the cross sections are usually extremely low, down to the femto-barn level.
The...
Phenomena beyond the standard model (SM) can manifest themself indirectly, by affecting the production and decay of SM particles. The decay B0->K* mu mu is a flavor-changing neutral current (FCNC) process particularly sensitive, since it is heavily suppressed in the SM. Recent results from LHCb collaboration show a tension with respect SM prediction of more than 3 sigmas. We will present...
Recent results on CMS searches for exotic decays of the Higgs boson H(125) will be presented in this talk including searches for invisible and quasi invisible decays, lepton flavour violating ($e\mu$, $e\tau$, $\mu\tau$) decays, and decays to light scalars. The current status of searches for rare decays of standard model Higgs boson will also be summarized.
We present the status of the global fit to electroweak precision data. The fit includes the latest available hadron collider measurements of the top-quark and the W-boson masses, as well as newest higher-order theoretical calculations. A large set of numerical and graphical results as well as Standard Model compatibility tests are presented. The global electroweak fit is also used to constrain...
Precision study of cosmic nuclei provides detail knowledge on the origin and propagation of cosmic rays. In the past, results of different experiments often had large uncertainty and are different of each other. AMS was designed to measure and identify cosmic ray nuclei with seven independent detectors, thus it is able to provide precision studies of nuclei simultaneously to multi-TeV...
The axion arises as a pseudo Nambu-Goldstone boson from the spontaneous breaking of a hypothetical global Peccei-Quinn symmetry introduced to provide a solution to the strong CP problem of quantum chromodynamics. Due to the weakness of the coupling with ordinary matters, the axion is regarded as a viable candidate of dark matter of the universe. However, the estimation of the axion dark matter...
The discovery of the Higgs physics together with the excellent performance of the LHC allow to make precision tests of Brout-Englert-Higgs Physics.
At this level, it becomes important to fully understand the theory behind this physics. As was already pointed out more than 35 years ago, there is a paradox in the standard model: The elementary fields should not be the particles we observe, as...
The LHCb experiment, thanks to its System for Measuring Overlap with Gas (SMOG), has the unique capability to operate in a fixed target mode with the LHC beams.
Reactions of incident LHC proton beams on noble gas targets have been recorded by the LHCb experiment at a center-of-mass energy of 110 GeV and within the center-of-mass rapidity range -2.3 < y* < 0.2. Results on anti-proton production...
We present precise measurements of decay properties of hadrons containing a b quark performed on the data collected by the CMS experiment at LHC. The lifetime is among the fundamental properties of particles and in heavy hadrons it is one of the important observables that allows to test the theoretical tools describing their physics. Some of the reported measurements are at the precision level...
Following successful demonstrations of the potential of highly granular calorimeters by the CALICE collaboration, the emphasis of current R&D has shifted to the next generation of prototypes. Optimized for Particle Flow Algorithms (PFA) which will achieve unprecedented jet energy resolution at future colliders, this new generation of CALICE calorimeters also addresses full system requirements...
The knowledge of the energy dependence of the $^{3}$He-to-$^{4}$He flux ratio ($^{3}$He/$^{4}$He) is one of the most important sources for studying and testing cosmic ray propagation models.
Similar to the B/C measurement, where B is assumed to originate from interactions of primary Carbon and Oxygen in Cosmic Rays, in the $^{3}$He/$^{4}$He measurement $^{3}$He is assumed to be produced by...
Heavy flavour production measurements in proton-proton collisions are important tests of QCD.
We report on updated production cross-section measurement of quarkonia, open-charm, and open-beauty states. Other aspects related to the quarkonium production mechanisms, such as the associative production of quarkonium and jets, will be discussed.
Low mass dielectron measurements in ultra-relativistic heavy-ion collisions
bring an important information on the properties of the hot and dense QCD medium and whole space-time evolution of the medium created in heavy-ion collisions.
Dielectrons in the mass range below 1 GeV/$c^2$, are from ordinary Dalitz and resonance decays of pseudoscalar and vector mesons. Dielectron invariant mass from...
The Pixel Luminosity Telescope (PLT) is a dedicated system for luminosity measurement at the CMS experiment using silicon pixel sensors arranged into "telescopes", each consisting of three planes. It was installed during LS1 at the beginning of 2015 and has been providing online and offline luminosity measurements throughout Run 2. The online bunch-by-bunch luminosity measurement employs the...
In the recent past, several hints of inconsistencies between experimental results and theory predictions in the framework of the Standard Model (SM) have been obtained from measurement of $B$-meson decays, though no beyond-SM (BSM) effects have been observed yet.
We report here about a few recent searches for BSM effects in B-meson decays performed with the full BaBar data sample, collected...
We discuss the constraints on the Standard Model Effective Field Theory inferred from global fits to electroweak data. In particular, we focus on two unconstrained combinations of Wilson coefficients that are present when the analysis is restricted to measurements of $\bar\psi\psi\rightarrow \bar\psi\psi$ scatterings. We show how these unconstrained directions arise due to a...
Some theories predict Lepton Flavour Violating decays of the Higgs boson, while other predict enhanced decay rates in rare modes like Z-photon, J/Psi-photon and Phi-photon or into invisible particles. Such decays are searched for using about 36 fb-1 of p-p collisions at 13 TeV.
Precision measurements of neutrino oscillation probabilities require an improved understanding of neutrino-nucleus interactions. MINERvA is a neutrino scattering experiment at Fermilab that utilizes the intense neutrino beam from the NuMI beam-line and a finely segmented scintillator based tracking detector to measure neutrino cross sections on various nuclear targets. MINERvA has published...
The Pierre Auger Observatory, located in Argentina, has been detecting ultra-high energy cosmic rays for more than ten years. The combination of a large surface detector array and fluorescence telescopes provides a substantial improvement in energy calibration and extensive air shower measurements, resulting in data of unprecedented quality in the energy range from 0.1 EeV up to 100 EeV. A...
The aim of the ATLAS Forward Proton (AFP) detector system is the measurement of protons scattered diffractively or
electromagnetically at very small angles. The first arm of the system was installed last year and AFP took data in several commissioning and physics runs. The installation of the second arm is ongoing and will be completed in time for the 2017 data taking period. This will allow...
A simultaneous fit of parton distribution functions (PDFs) and electroweak
parameters to HERA data on deep inelastic scattering is presented. The input
data are the neutral current and charged current inclusive cross sections
which were previously used in the QCD analysis leading to the HERAPDF2.0
PDFs. In addition, the polarisation of the electron beam was taken into
account for the ZEUS data...
The T2K long-baseline neutrino experiment has new neutrino cross-section measurements. In addition to being interesting in their own right, measuring neutrino cross sections is vital as they correspond to a major systematic uncertainty for neutrino oscillation analyses. In particular, the new results focus on exploiting the water targets
in the T2K off-axis near detector, ND280, updating our...
Several theories, like the Minimal Supersymmetric Standard Model, predict a high mass neutral Higgs boson with a significant decay rate into the bb, mu-mu or tau-tau final states. The search for a scalar resonance in fermion decay channels is presented, using about 36 fb-1 of p-p collisions at 13 TeV.
We report on the first observation of excited hadronic states in both the charm and beauty sector with special emphasis on the observation of five excited Omega_c states.
Similar techniques are used to analyse LHCb data for short-lived intermediate bound-states formed during the multi-body decay of b-hadrons.
The Belle II experiment at the SuperKEKB collider is a major upgrade of the KEK ``B factory'' facility in Tsukuba, Japan. The machine is designed for an instantaneous luminosity of 8x10^35 cm^-2s^-1, and the experiment is expected to accumulate a data sample of about 50 ab^-1 in five years of running. With this amount of data, decays sensitive to physics beyond the Standard Model can be...
The matter formed in central heavy-ion collisions at a few GeV per nucleon is commonly understood as resonance matter, a gas of nucleons and excited baryonic states with a substantial contribution from mesonic, mostly pionic excitations. Yet, in the initial phase of the reaction the system is compressed to beyond nuclear ground state density and hence substantial modifications of the hadron...
The balloon-borne ANITA experiment is designed to detect the radio-frequency Cherenkov radiation resulting from collisions of either ultra-high energy (UHE) neutrinos colliding with ice molecules, or cosmic rays interacting with air molecules in the atmosphere. Thus far, four flights over the last decade have yielded world's-best sensitivity in the E>1 EeV regime. The HiCal experiment,...
Using inclusive DIS cross sections measured with the H1 experiment at HERA, electroweak parameters of the Standard Model are probed. The cross sections were determined using longitudinally polarized lepton beams, which enhances the sensitivity to the vector couplings of the light quarks. The quark couplings and the electroweak mixing angle are probed through the $\gamma/Z$ interference. This...
The latest results from ATLAS on heavy flavour and quarkonium production, including exotic states, are presented. This talk includes the measurement of B-hadron pair production, presented as a function of a variety kinematic variables between the two B-hadrons, providing important inputs to modelling of production via gluon splitting. Additional Insight into QCD models of quarkonium...
MicroBooNE is a liquid-argon-based neutrino experiment, which is collecting data in the Fermilab Booster Neutrino Beam. MicroBooNE will directly probe the source of the anomalous excess of electron-like events in MiniBooNE, while also measuring low-energy neutrino cross sections and providing important R&D for future detectors. It is the first of three liquid argon TPC detectors planned for...
A summary of recent progress of MSSM Higgs searches in CMS experiment. And also including Higgs like resonance searches with other BSM models, for example 2HDM, Gravitons, etc.
We study the naturalness properties of the B − L Supersymmetric Standard Model (BLSSM) and compare them to those of the Minimal Supersymmetric Standard Model (MSSM) at both low (i.e., Large Hadron Collider) energies and high (i.e., unification) scales. By adopting standard measures of naturalness, we assess that, in presence of full unification of the additional gauge couplings and...
New and recent results from the ATLAS programme of studies in EW physics with open beauty are presented. FCNC processes are sensitive to NP contributions, in particular through additional electroweak loop amplitudes. The angular analysis of the decay of Bd -> K* mu mu for a number of angular coefficients are measured as a function of the invariant mass squared of the di-muon system for data...
The microscopic description of heavy-ion reactions at low beam energies is
achieved within hadronic transport approaches. In this talk a new approach
SMASH (Simulating Many Accelerated Strongly-interacting Hadrons) is
introduced, verified, and applied to study particle production at $E_{Kin}$ =
0.4 - 2 A GeV in Au+Au collisions. First SMASH results for strangeness production are presented....
The Deep Underground Neutrino Experiment (DUNE) experiment, a 40-kton underground liquid argon time-projection-chamber detector, will have unique sensitivity to the electron flavor component of a core-collapse supernova neutrino burst. We present expected capabilities of DUNE for measurements of neutrinos in the few-tens-of-MeV range relevant for supernova detection, and the corresponding...
I present theoretical results for charged Higgs production in association with a W boson or a top quark at the LHC. I calculate higher-order threshold corrections and show that they are very significant. I present detailed results for total cross sections as well as transverse-momentum and rapidity distributions of the Higgs boson for various LHC energies.
A general overview of the landscape for WIMP and non-WIMP DM at colliders is presented, highlighting new results but also showcasing the directions of the search program of the two general purpose experiments ATLAS and CMS towards the full Run-2 dataset.
I will show how transport calculations, interfaced with a realistic hydrodynamic modeling of the background medium, allow one to provide predictions for momentum and angular distributions of heavy-flavour particles in high-energy nuclear collisions, to be compared eventually with experimental data (D/B-mesons and their decay products). The presence of a hot-deconfined medium (Quark-Gluon...
A global analysis of neutrino masses and mixings, performed within the standard three-neutrino framework, is presented. The combination of current data coming from oscillation experiments, neutrinoless double beta decay searches, and cosmological surveys, provides interesting constraints on the known mass-mixing parameters, as well as intriguing hints on the unknown ones. Concerning the...
The production of electroweak gauge bosons in association with a jet, V+jet, constitutes an important class of standard-candle processes at the LHC. The requirement of an additional hadronic jet in the final state introduces a direct sensitivity to the strong coupling constant and the gluon PDF, while still retaining a large event rate. As such, V+jet production provides an ideal testing...
The talk provides an overview of the status of SUSY breaking scenarios. The focus will be on the way the electroweak symmetry breaking is achieved and understood in different scenarios. Various aspects of naturalness and its implication will be discussed and compared.
I present results for the invariant and helicity amplitudes in the transitions
$\Lambda_b~\to~\Lambda^\ast(J^P)~+~J/\psi$ where
$\Lambda^\ast(J^P)$ are $sud$-resonances with
$J^P=\frac12^{\pm},\frac32^{\pm}$. The calculations are performed in
the framework of our covariant confined quark model.
We find that the values
of the helicity amplitudes for the $\Lambda^\ast(1520,\,\frac32^-)$
and...
In coming years the LHC is expected to undergo upgrades to increase both the energy of proton-proton collisions and the instantaneous luminosity. In order to cope with these more challenging LHC conditions, upgrades of the ATLAS trigger system will be required. This talk will focus on some of the key aspects of these upgrades. Firstly, the upgrade period between 2019-2021 will see an...
Several theories beyond the Standard Model, like the 2HDM, predict the existence of high mass charged Higgs particles. Such charged Higgs, produced in association with a top quark or in VBF, are searched for in several decay channels, using about 36 fb-1 of p-p collisions at 13 TeV.
ATLAS has embarked on a major program of development in its offline software framework and the indexing of the data. In this paper we outline the motivations for such major changes, based on expected CPU evolution in the next decade, the increasing need to use memory more efficiently, and the increase of data volume expected for the LHC Run 3. The offline software framework, Athena will...
I review theoretical progress in the study of semileptonic tree-level B decays and its interplay with recent experimental results. In particular, I focus on two anomalies: the ratios $R(D)$, $R(D^{*})$:
$R(D^{(*)})=\frac{BR(B-> D^{(*)} \tau \bar \nu_\tau)}{BR(B-> D^{(*)} \ell \bar \nu_\ell)}$
and the inclusive vs exclusive determination of $|V_{cb}|$.
I review several explanations for such...
The production of jets in association with vector bosons is an important process to study perturbative QCD in a multi-scale environment. The ATLAS collaboration has performed new measurements of vector boson + jets cross sections, differential in several kinematic variables, in proton-proton collision data taken at center-of-mass energies of 8 TeV and 13 TeV. The measurements are compared to...
The LHC heavy-ion physics program aims at investigating the properties of the Quark-Gluon Plasma, QGP, formed in such collisions. Heavy quarks (charm and beauty) are regarded as efficient probes to study and characterize the QGP, as they are created on a very short time scale in initial hard processes and subsequently experience the entire system evolution interacting with the medium...
We report on searches for new physics in events with one or more jets and missing transverse energy. The searches use proton-proton collision data recorded in 2016 by the CMS experiment at the LHC. The results are interpreted in terms of several simplified models of supersymmetry.
The Deep Underground Neutrino Experiment (DUNE) is a long-baseline neutrino oscillation experiment with primary physics goals of determining the neutrino mass hierarchy and measuring delta_CP with sufficient sensitivity to discover CP violation in neutrino oscillation. CP violation sensitivity in DUNE requires careful understanding of systematic uncertainty, with contributions expected from...
I consider the Standard Model extended by a heavy scalar singlet and derive the low-energy effective theory resulting from integrating out the heavy state. This exercise in effective field theory serves to illustrate with a simple example the systematics of the linear and nonlinear electroweak effective Lagrangians and to clarify the relation between them. I discuss power-counting aspects and...
A new measurement of a spatially extended gamma-ray signal from the center of M31
was published recently, reporting that the emission broadly resembles the so-called
Galactic center excess of the Milky Way (Ackermann et al. 2017, arXiv:1702.08602).
In this talk we discuss the possibilities that the signal originates from a
population of millisecond pulsars, or alternatively the annihilation of...
The upcoming upgrade of the CERN LHC injectors during 2019-20 will boost the luminosity and the collision rate beyond the design parameters of several of the key ALICE detectors including the forward trigger detectors. The nominal Pb-Pb interaction and readout rate for ALICE after LS2 will reach 50 kHz. To face this challenge the Fast Interaction Trigger (FIT) is being designed and...
The presence of a non-baryonic dark matter component in the Universe is inferred from the observation of its gravitational interaction. If dark matter interacts weakly with the Standard Model it would be produced at the LHC, escaping the detector and leaving a large missing transverse momentum as their signature. The ATLAS detector has developed a broad and systematic search program for dark...
Despite the absence of experimental evidence, weak scale supersymmetry remains one of the best motivated and studied Standard Model extensions. This talk summarises recent ATLAS results on inclusive searches for supersymmetric squarks and gluinos, including third generation squarks produced in the decay of gluinos. The searches involve final states containing jets, missing transverse momentum...
LHC results on tree-level beauty decays
Tree-level beauty decays present crucial ingredients in the search for physics beyond the SM through quark flavour changing transitions.
This contribution covers recent LHC results in charged-current semileptonic decays and beauty decays to both charmed and charmless fully hadronic final states.
The semileptonic decays must be studied to determine the...
Charm quarks possess large masses and thus they are expected to be primarily produced at the initial stages of heavy-ion collisions. Hot and dense nuclear matter, usually referred to as the Quark-Gluon Plasma (QGP), can also be created in these collisions. Therefore, the QGP can be studied using charm quarks as penetrating probes via the in-medium energy loss, which is directly related to the...
The most recent results on the production of single W and Z bosons with two jets at high invariant mass at centre-of-mass energies of 7, 8 and 13 TeV are presented. Integrated and differential cross sections are measured in different phase space regions with varying degree of sensitivity to the electroweak production in vector boson fusion. The cross section for the electroweak W boson...
The talk aims to present the most recent results on heavy scalar search in diboson final states (WW,ZZ) combining different final states using full 2016 data collected by CMS detector.
Hyper-Kamiokande is a planned next-generation multi-purpose megaton-scale water Cherenkov detector in Japan. It is situated along the same J-PARC beam line as T2K. The detector, which is heavily influenced by its successful predecessor Super-Kamiokande, will consists of two cylindrical tanks filled with 260 ktons of ultrapure water, a volume approximately 10 times larger than Super-Kamiokande....
The ARGO-YBJ experiment was installed in the Tibet region of China, 4300 meters above sea level. It run continuously from November 2007 until February 2013, with the goal of observing astronomical gamma-ray sources in the energy range between a few hundred GeV and about 100 TeV, and primary cosmic rays in the energy range between about 1 TeV and a few PeV. The unique feature of the ARGO-YBJ...
The study of the associated production of vector bosons and jets constitutes an excellent testbench to check numerous QCD predictions. Total and differential cross sections of vector bosons produced in association with jets has been studied at both 8 and 13 TeV center-of-mass energies. Differential distributions as function of a broad range of kinematical observables are measured and compared...
The future of connectivity is wireless, and the HEP community is not an exception. The demand for high capacity data transfer continues to increase year over year at a significant rate. This is an on-going race where technology and applications developers push into higher and higher bandwidths. For example the tracking detectors require readout systems with several thousand links that has to...
We address the present theoretical challenge to have a self-consistent description of both the $R_{AA}(p_T)$
and the elliptic flow $v_2(p_T)$ at both RHIC and LHC.
We describe the heavy quarks dynamics in the quark-gluon plasma (QGP) by means of
a Boltzmann transport approach in which the non-perturbative interaction between
heavy quarks and light quark is described by means of a quasi...
Several theories beyond the Standard Model, like the EWS or 2HDM models, predict the existence of high mass Higgs particles, which could decay into final states with Weak bosons. In this presentation the latest ATLAS results on these searches will be discussed, using about 36 fb-1 of p-p collisions at 13 TeV.
The presence of dark matter is known from cosmological observations yet it has so far escaped direct detection. As a consequence there has been renewed interet in hidden-sector models that predict new particles that are singlets with respect to the Standard Model (SM) gauge bosons and thus interact very weakly with the Standard Model particles.
The LHCb experiment allows to search for these...
We report on searches for new physics in events with one or more charged leptons, jets and missing transverse momentum. The searches use proton-proton collision data recorded in 2016 by the CMS experiment at the LHC. The results are interpreted in terms of several simplified models of pair production of supersymmetric partners of gluons or quarks.
The Cherenkov Telescope Array is expected to lead to the detection of many new supernova remnants in the TeV and multiTeV range. In addition to the individual study of each, the study of these objects as a population can help constraining the parameters describing the acceleration of particles and increase our understanding of the mechanisms involved. Using Monte Carlo methods, the population...
Galaxy surveys require support from massive datasets in order to achieve precision estimations of cosmological parameters. The CosmoHub platform and SciPIC pipeline have been developed at the Port d'Informació Científica (PIC) to provide this support, achieving nearly interactive performance in the processing of multi-Terabyte datasets. Cosmology projects currently supported include ESA's...
We point out that the stringent lower bounds on the masses of additional neutral and charged Higgs bosons crucially depend on the flavour structure of their Yukawa interactions. We show that these bounds can easily be evaded when flavour violation is allowed in the Higgs sector. As an illustration, we study the phenomenology of a two Higgs doublet model with a Yukawa texture arising from...
Despite the absence of experimental evidence, weak scale supersymmetry remains one of the best motivated and studied Standard Model extensions. This talk summarises recent ATLAS results on inclusive searches for supersymmetric squarks and gluinos, including third generation squarks produced in the decay of gluinos. The searches involve final states containing jets, missing transverse momentum...
The nuSTORM facility will provide \nu_e and \nu_\mu beams from the
decay of low energy muons confined within a storage ring. The
instrumentation of the ring, combined with the excellent knowledge of
muon decay, will make it possible to determine the neutrino flux at
the %-level or better. The neutrino and anti-neutrino event rates are
such that the nuSTORM facility serving a suite of near...
Rare B decays with leptons in the final state are powerful probes to search for physics beyond the Standard Model (SM) as they can be calculated in the SM with high precision. We report recent results on rare B decays with leptons from the Belle experiment at the KEKB $e^+ e^-$ collider. The $B \to D^* \tau^+ \nu$ mode is sensitive to New Physics effects such as a charged Higgs or leptoquark...
Heavy quarks (charm and beauty) are probes of the Quark-Gluon Plasma (QGP) formed in high-energy nuclear collisions. They are produced in hard partonic scattering processes occurring in the initial stage of the collisions, propagate through the medium, and interact with its constituents, thus probing the entire evolution of the system.
The heavy-flavour production in proton-nucleus...
The dark photon, $A′$, the dark Higgs boson, $h′$, and the dark baryon, $B'$, are hypothetical constituents featured in a number of recently proposed Dark Sector Models. Dark Sector particles can be produced in the dark Higgs-strahlung and radiative processes, and in neutral $D$-meson decays channels. We will present results for the search of dark sector particles with prompt and displaced...
The associated production of vector bosons, W or Z, and jets originating from heavy-flavour quarks is a large background source in measurements of several standard model processes, Higgs boson studies, and many searches for physics beyond the SM. The study of events with one or two well-identified and isolated leptons accompanied by heavy-flavour jets is crucial to refine the theoretical...
The Recursive Jigsaw reconstruction technique provides a powerful way to tackle challenging SUSY final states with multiple missing particles. By altering the input "decay tree" we demonstrate a new approach to considering compressed SUSY signatures from a variety of different sources. The imposition of this decay tree provides a clear way to define which objects are associated with an ISR...
The next-generation B-factory experiment Belle II at the upgraded KEKB accelerator, SuperKEKB, will start physics data taking in 2018. It is an asymmetric e+e- collider that will operate with 40x the instantaneous luminosity of KEKB/Belle and aims to collect 50 times more data in total.
Belle II offers the possibility to search for a large variety of dark sector particles in the GeV mass...
We will discuss methods and results concerning the angular cross-correlation between sky-maps of the extragalactic background radiation in different wavelength bands.
The main goal of the study is to extract information on the clustering, redshift distribution and type of the unresolved non-thermal sources, especially at gamma-ray (and radio) frequencies.
We will show how this technique can be...
Precision tests of the Standard Model can be successfully performed at the LHC
only if QCD and EW radiative corrections are under control.
In this presentation I will discuss the non trivial interplay between the two sets of corrections, using several observables which can be measured in the Drell-Yan processes to illustrate the conceptual and technical problems that arise in the...
After measuring in 2012 a relatively large value of the neutrino mixing angle θ13, the door is now open to observe for the first time a possible CP violation in the leptonic sector. The measured value of θ13 also privileges the 2nd oscillation maximum for the discovery of CP violation instead of the usually used 1st oscillation maximum. The sensitivity at this 2nd oscillation maximum is about...
In this talk we would like to report on our recent calculations of the mixed QCD-EW corrections to the top- and bottom Yukawa couplings within the Standard Model (SM) and beyond (THDM, MSSM). After a brief review of the SM calculations, we would like to concentrate on the comparison SM/BSM and on the non-decoupling behavior of these corrections that might open a new window to indirect...
Performance & validation of new developments of reconstruction algorithms of several hadronic objects using data collected by the CMS experiment in 2016 at a centre-of-mass energy of 13 TeV are presented.
The jet energy and missing transverse momentum scales are measured in MC and data. A likelihood based discriminator is used to distinguish jets originating from quarks and gluons, and...
Strangeness production at high multiplicity gives indications on the transverse size fluctuactions in AA,pA and pp. In particular the universal behavior
of strange particle hadronization in small and large systems can be tested for the specific particle species, for different centralities and for large fluctuation of the transverse size
in pA and pp by using the recent ALICE data. The...
The identification of jets containing b-hadrons is key to many physics analyses at the LHC, including measurements
involving Higgs bosons or top quarks, and searches for physics beyond the Standard Model. In this contribution, the
most recent enhancements in the capability of ATLAS to separate b-jets from jets stemming from lighter quarks, and
the latest measurements to calibrate the...
Due to their large branching fractions and good theoretical uncertainties, semileptonic b-hadron decays are excellent tools to study the CKM matrix and b-hadron properties such as lifetimes. The LHCb experiment has a very good potential for studies of semi-leptonic decays of b-hadrons, due to its excellent muon identification capabilities and very good reconstruction of decay vertices. In this...
Scenarios where multiple SUSY states are nearly degenerate in mass produce soft decay products, and they represent an experimental challenge for ATLAS. This talk presents recent results of analyses explicitly targeting such “compressed” scenarios with a variety of experimental techniques. All results make use of proton-proton collisions collected at a centre of mass of 13 TeV with the ATLAS detector.
To date, only two modes of production at hadron colliders of dark matter through new scalar or pseudoscalar mediators have been considered in the existing literature: pairs of dark matter particles produced through top quark loops with an associated hadronic jet in the event (monojet), and production of dark matter with pairs of heavy flavoured top or bottom quarks.
We present a third,...
We present new ALICE results on the production of strange and multi-strange hadrons in Pb-Pb collisions at the top LHC energy of $\sqrt{s_{\rm NN}}$ = 5.02 TeV.
Strangeness production measurements are powerful tools for the study of the thermal properties of the deconfined state of QCD matter, the Quark-Gluon Plasma.
Thanks to its unique tracking and PID capabilities, ALICE is able to measure...
The precision era of neutrino physics requires measurements of absolute neutrino cross sections at the GeV scale with exquisite (1%) precision. These measurements are presently limited by the uncertainties on neutrino flux: the goal of the ERC ENUBET Project is to demonstrate that such uncertainties can be removed employing novel monitoring techniques of the leptons at the neutrino source. In...
The Two-Higgs-doublet model (2HDM) is one of the most studied extensions of the Standard Model. But just as the other popular "New Physics" models, it gets more and more constrained by recent experimental progress, especially by the LHC data. For all four 2HDM types with a softly broken $Z_2$ symmetry, we present updated results of global analyses obtained with the open-source HEPfit code. We...
The MAGIC telescopes, located at the Roque de los Muchachos
Observatory (2200 a.s.l.) in the Canary Island of La Palma,
are placed on the top of a mountain, from where a window of visibility of about $5^{\circ}$ in zenith and $80^{\circ}$ in azimuth is open in the direction of the surrounding ocean. This permits to search for a signature of particle showers induced by earth-skimming cosmic tau...
In this talk, we describe the computation of higher-order QED effects relevant in hadronic collisions. In particular, we discuss the calculation of mixed QCD-QED one-loop contributions to the Altarelli-Parisi splittings functions, as well as the pure two-loop QED corrections. We explain how to extend the DGLAP equations to deal with new parton distributions, emphasizing the consequences of the...
The availability of computing resources is a limiting factor in data collection at the LHCb experiment, due to the high production rate of beauty and charm hadrons. For Run 2, LHCb has implemented a novel approach to make optimal use of these resources: The output of the first software trigger stage is buffered to disk and the second stage is executed asynchronously, using 100% of the...
We report on searches for supersymmetry in scenarios where the mass differences between the lightest supersymmetric particles are small, or where their decay chains involve a Higgs boson. The searches use proton-proton collision data recorded in 2016 by the CMS experiment at the LHC. The results are interpreted in terms of several simplified models of supersymmetry.
The Super-Kamiokande (SK) Collaboration has committed to the the SuperK-Gadolinium project that, by dissolving a Gd salt at 0.2 % in mass in the SK water, will upgrade the detector to be able to identify neutrons with very high efficiency. The current expected time
for refurbishment of SK and start of this new phase is 2018.
In this talk we present the physics benefits of high efficiency...
We present recent results on the extraction of Vcb from data on B->D^* l nu decays. Using two different parameterizations of form factors, we show how theory input from Heavy Quark Effective Theory or Light Cone Sum Rules affect the value of Vcb. The results show that the inconsistency of Vcb extractions in exclusive and inclusive decays needs a reappraisal.
Taking into account that LCH searches for New Physics are failing, the electroweak effective theory seems to be appropriate to deal with current energies. Tracks of new higher scales can be studied through next-to-leading corrections of the electroweak effective theory. Assuming strongly-coupled scenarios we have considered high-energy Lagrangians which incorporate explicitly new heavy fields....
In this talk, the centrality dependence of the $p_{\rm T}$ spectra of unidentified charged hadrons as well as of charged pions, kaons, (anti)protons and resonances in Pb-Pb collisions at the unprecedented energy of $\sqrt{s_{\rm{NN}}} = 5.02$ are presented. The $p_{\rm T}$-integrated particle yields are compared to predictions from thermal-statistical models and the evolution of the proton to...
It is well known that dark matter density measurements, indirect and direct detection experiments, importantly complement the LHC in setting strong constraints on new physics scenarios. Yet, dark matter searches are subject to limitations which need to be considered for realistic analyses. For illustration, we explore the parameter space of the phenomenological MSSM and discuss the interplay...
Isolated photons with high transverse energy components have been studied in $ep$
scattering with the ZEUS detector at HERA, using 326 pb$^−1$ integrated luminosity. The kinematic region includes photon virtualities 10 < $Q^2$ < 350 GeV$^2$. Photons with transverse energy 4 < $E_T^\gamma$ < 15 GeV and pseudorapidity −0.7 < $\eta^\gamma$ < 0.9 were measured with accompanying jets having...
New results on transverse momentum spectra of identified charged hadrons in proton-proton collisions at sqrt(s) = 13 TeV are presented using CMS detector at the LHC. Charged pions, kaons, and protons in the transverse-momentum range pT = 0.1-1.7 GeV/c and for laboratory rapidities |y| < 1 are identified via their energy loss in the CMS silicon tracker. The pT spectra and integrated yields are...
We present a search for a Higgs-like particle $\phi$ decaying into $b\bar{b}$ produced in association with $b$ quarks in p$\bar{p}$ collisions. The event sample corresponds to 5.4 $\text{fb}^{-1}$ of integrated luminosity collected with the CDF II detector at the Tevatron collider using a single $b$ tagged jet trigger. We search for an enhancement in the mass of the two leading jets in event...
The 40kt DUNE Far Detector, located at the Sanford Underground Research Facility, will offer unique capabilities for the study of atmospheric neutrinos. Due to the detector’s excellent energy resolutions, angular resolutions, and particle ID capabilities, atmospheric neutrino analyses in DUNE can provide valuable information about 3-flavor oscillations, despite the relatively modest...
I discuss the feasibility to search for supersymmetry in the decays of heavy Z' bosons, predicted by GUT-inspired U(1)' models, by investigating final states with charged leptons and missing energy in pp collisions at the LHC. I also investigate decays into pairs of the lightest MSSM neutralinos, which are Dark Matter candidates, and update the exclusion limits on the Z' mass, accounting for...
The Deep Underground Neutrino Experiment (DUNE) will employ a uniquely large Liquid Argon Time Projection chamber as the main component of its Far Detector. It will include four 10kt modules which will include single and dual-phase Liquid Argon technologies.
In order to validate its design, an experimental program been initiated which includes a beam test of large-scale DUNE prototypes at CERN...
The CKM angle gamma is the least well-known angle of the unitarity triangle, and the only one easily accessible at tree level. Important constraints on gamma are obtained from time dependent analysis of flavour-tagged Bs -> Ds K decays, and the latest results using the full LHCb Run 1 dataset are presented here. The ultimate goal of degree level precision for gamma requires exploitation of all...
ANTARES is the first undersea neutrino telescope and, at present, the largest one in the Northern hemisphere. Its main goal is the search for high-energy astrophysical neutrinos. It consists of an array of photomultipliers tubes housed in so-called optical modules, detecting the Cherenkov light induced along the path of relativistic charged particles originated by neutrino interactions in and...
I will present the latest results for global fits to the Higgs portal scalar singlet extended standard model using complementary probes of dark matter. In doing so I will introduce the new global and modular beyond the standard model inference tool (GAMBIT), which we use to achieve these results in a statistically consistent and modular way.
The production of prompt isolated photons at hadron colliders provides a stringent test of perturbative QCD and can be used to probe the proton structure. The ATLAS collaboration has performed precise measurements of the inclusive production of isolated prompt photons at a center-of-mass energy of 13 TeV, differential in both rapidity and the photon transverse momentum. In addition, the...
Hyper-Kamiokande is a next generation water Cherekov detector consisting of 2 tanks,each with 187 kton fiducial mass, to be built in a staged approach.
Hyper-Kamiokande will detect neutrinos produced by the upgraded J-PARC accelerator complex, as well as atmospheric neutrinos.
It will make precision measurements of neutrino mixing parameters by a combination of accelerator and atmospheric...
At the end of 2015 the ALICE experiment at the LHC has recorded Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV, that complement the dataset from Run 1. Both datasets contain a variety of (anti-)(hyper-)nuclei produced in the collisions, namely (anti-)deuteron, (anti-)triton, (anti-)helium-3, (anti-)alpha and (anti-)hypertriton. Furthermore, the large high quality data sample of pp...
We report on searches for supersymmetric partners of top and bottom quarks. The searches use proton-proton collision data recorded in 2016 by the CMS experiment at the LHC. The results are interpreted under several assumptions for the decay of these particles.
I present results of an analysis of scalar contributions in b→cτν transitions including the latest measurements of R(D(∗)), the q2 differential distributions in B→D(∗)τν, the τ polarization asymmetry for B→D∗τν, and the bound derived from the total width of the Bc meson. Scalar contributions with the simultaneous presence of both left- and right-handed couplings to quarks can explain the...
We present the plan for the Deep Underground Neutrino Experiment (DUNE) photon detector system and recent research and development work that has contributed to the design. DUNE will be composed of multiple liquid argon time projection chambers (TPCs). In order to determine the full 3D position of a particle in the detector its initial time must be known accurately. This initial time can be...
The IceCube detector has observed the first clear detection of a diffuse astrophysical high energy neutrino flux, however, the sources for these neutrinos have yet to be found. Hadronic interactions around cosmic ray accelerators result in both high energy gamma and neutrino fluxes for neutral and charged pion decays respectively. Observing cosmic ray sources with neutrinos provides unique...
A High Granularity Calorimeter (HGCAL) is presently being designed by the CMS collaboration to replace the existing end cap detectors. The HGCAL must be able to cope with the very high collision rates, imposing the development of novel filtering and triggering strategies, as well as with the harsh radiation environment of the High Luminosity LHC. In this talk we present an overview of the full...
Charmless b-hadron decays are CKM suppressed in the Standard Model, which brings the tree amplitudes to levels comparable with corresponding loop amplitudes. Hence, new particles not foreseen in the SM that appear in the loops may alter observables of these decays. We present the most recent measurements of branching ratios and CP asymmetries in charmless b-hadron decays to two- and multi-body...
Jet quenching in the hot, dense medium formed in Au+Au collisions leads to the suppression of high $p_T$ particles which can be studied with the measurement of the leading hadrons, like $\pi_0$. They can be used to investigate the mechanism of energy loss of partons in a QGP when varying the collision geometry.
Asymmetric Cu+Au collisions provide a system with similar energy density but...
The indirect searches for dark matter particles are a very hot topic of today's physics and astrophysics. The energy-mass content of the Universe is one of the biggest riddles of modern science. The Standard Model describes the physics of only a small fraction of the Universe. Although only gravitational interaction of the dark matter with normal matter was observed up to now, a lot of effort...
Naturalness arguments for weak-scale supersymmetry favour supersymmetric partners of the third generation quarks with masses not too far from those of their Standard Model counterparts. Top or bottom squarks with masses less than or around one TeV can also give rise to direct pair production rates at the LHC that can be observed in the data sample recorded by the ATLAS detector. The talk...
We study Lorentz violation effects to flavor transitions of high energy
astrophysical neutrinos. It is shown that the appearance of Lorentz violating
Hamiltonian can drastically change the flavor transition probabilities of
astrophysical neutrinos. Predictions of Lorentz violation effects to flavor
compositions of astrophysical neutrinos arriving on Earth are compared with
IceCube flavor...
LHCb, while purpose built for b-physics, also functions as a general purpose forward detector, covering the pseudo-rapidity range 2.0 to 5.0. We present the latest measurements of W and Z boson production. These benchmark measurements are used to constrain the parton distribution functions that describe the inner structure of the proton, and to test the modelling of Standard Model processes....
We present the performance of Higgs boson property measurements and BSM Higgs searches using the CMS detector in the High-Luminosity LHC conditions, with an integrated luminosity of up to 3000 fb-1. Projections of 13 TeV analyses and 14 TeV simulation studies are both shown.
During the last years several Dark Sector Models have been proposed in order to address striking astrophysical observations which fail standard intepretations.
In the minimal case a new vector particle, the so called dark photon (U or A' boson), is introduced, with small coupling with Standard Model particles. Also, the existence of a dark Higgs boson h' is postulated, in analogy with the...
NA61/SHINE is a fixed target experiment at the CERN Super-Proton-Synchrotron. The main goals of the experiment are to discover the critical point of strongly interacting matter and study the properties of the onset of deconfinement. In order to reach these goals, a study of hadron production properties is performed in nucleus-nucleus, proton-proton and proton-nucleus interactions as a function...
Three key issues pertaining to the semi-leptonic RD(*) anomalies will be addressed here:
1) How robust are the SM predictions?
2) What are the model-independent collider signature of these anomalies?
3) What are some of the simplest BSM explanations for these?
In answer to 1) latest information from on and off the lattice will be critically
examined to question, in particular the reliability...
The Belle II experiment is a substantial upgrade of the Belle detector; it will operate at the SuperKEKB energy-asymmetric e+e− collider. The detector is in its final phase of construction and the accelerator has successfully completed the first phase of commissioning. The design luminosity is 8×1035cm−2s−1, and the Belle II experiment aims to record 50 ab−1 of data, a factor of 50 more than...
The intense photon fluxes of relativistic nuclei provide a possibility
to study photonuclear and two-photon interactions in ultra-peripheral collisions (UPC)
where the nuclei do not overlap and no strong nuclear interactions occur.
The study of such collisions provides information about the initial state of nuclei (nPDF).
Exclusive $J/\psi$ production in UPC which is sensitive to the...
Accelerator Driven System (ADS) subcritical reactors are being developed around the world. The main goals of this kind of facility are to produce energy and, at the same time, to dispose of nuclear waste, which will be used to power nuclear reactors. Since, by itself, used nuclear fuel is not able to sustain a chain reaction, the additional neutrons needed will be supplied by a high-intensity...
Massive photon-like particles are predicted in many extensions of the Standard Model with a hidden sector where dark matter is secluded. They are vector bosons mediating the interaction between dark matter particles and can be produced in scattering of ordinary particles through a faint mixing to the photon. Most of the present experimental constraints on this “dark photon” (A’) rely on the...
The discovery of the 125 GeV Higgs boson, which was the last missing element of the standard model (SM), provided us the insight that the electroweak symmetry breaking is done by a Higgs condensate in the vacuum, namely the Higgs mechanism. However the SM does not give the dynamics explaining why and how that Higgs condensate is formed. On the other hand, the SM can not provide candidate...
A new detector exploiting the technology of Cylindrical Gas Electron Multipliers (CGEM) has been proposed to replace the innermost tracker chamber of BESIII (Beijing Electron Spectrometer) experiment, which is suffering from aging due to the high luminosity of Beijing Electron Positron Collider (BEPCII).
The CGEM Inner Tracker will deploy several new features w.r.t. other state-of-art GEM...
We present the xFitter project (former HERAFitter) which provides a unique open-source software framework for the determination of the proton's PDFs and for the interpretation of the physics analyses in the context of Quantum Chromodynamics.
We highlight the new xFitter software release which includes state-of-the-art
theoretical developments. We present a novel determination of the photon...
Investigating the phenomenology of semileptonic $B_s$ meson decays allows to further constrain the Standard Model and explore new, independent channels to determine important parameters, like the CKM matrix elements $|V_{ub}|$ and $|V_{cb}|$. Given different systematics of $B_s$ decays w.r.t. $B$ decays, this may help to shed light on the long-standing discrepancy between inclusive and...
I will explain various EFT approaches to learn about possible new physics lying beyond the SM. Particular emphasis will be put on EWSB physics and operators that break EW symmetry beyond the SM.
Gauge symmetries are known to be respected by gravity because gauge charges carry flux lines, but global charges do not carry flux lines and are not conserved by gravitational interaction. For discrete symmetries, they are spontaneously broken in the Universe, forming domain walls. Since the realization of discrete symmetries in the Universe must involve the vacuum expectation values of Higgs...
The strong nature of Composite Higgs models manifests at high energies through the growing behavior of the scattering amplitudes of longitudinally polarized weak bosons that leads to the formation of composite resonances as well as non resonant strong effects. In this work, the unitarity of these scattering amplitudes, computed on the framework of chiral perturbation theory, is used as tool to...
We live in a golden age for astro-particle physics, with a significant number of experiments actively monitoring high-energy Universe. Many of these probes provide excellent tests of particle physics models of dark matter particles. In particular, experiments such as Fermi -LAT, AMS-02, Ice Cube, ... are significantly cutting into the parameter space of one of the most popular candidates, the...
We present the most recent inclusive and differential measurements of multiboson production (VV, VVV) with data collected by the CMS during Run I & II.
I will review recent progress in the calculation of higher-order QCD corrections and their impact for precision measurements and new physics searches at the LHC.
I review the experimental indications in favor of short-baseline
neutrino oscillations. I discuss their interpretation in the framework
of 3+1 neutrino mixing with a sterile neutrino at the eV scale. I
present the results of the updated 3+1 global fit including the recent
MINOS, IceCube and NEOS data. I discuss the implications for future
neutrino oscillations and neutrinoless double-beta...
The High Luminosity LHC (HL-LHC) will integrate 10 times more luminosity than the LHC, posing significant challenges for radiation tolerance and event pileup on detectors, especially for forward calorimetry, and hallmarks the issue for future colliders. As part of its HL-LHC upgrade program, the CMS collaboration is designing a High Granularity Calorimeter to replace the existing endcap...
Measurements of the cross sections of the production of pairs of electroweak gauge bosons at the LHC constitute stringent tests of the electroweak sector of the Standard Model and provide a model-independent means to search for new physics at the TeV scale.
The ATLAS collaboration has performed new measurements of integrated and differential cross sections of the production of heavy di-boson...
Abstract content
We consider models of chaotic inflation driven by the real parts
of a conjugate pair of Higgs superfields involved in the
spontaneous breaking of a grand unification symmetry at a scale
assuming its Supersymmetric value. Employing Kaehler potentials
with a prominent shift-symmetric part proportional to c- and a
tiny violation, proportional to c+, included in a logarithm...
During the last two years the LHC produced pp collisions at the record center-of-mass energy of 13 TeV. The sensitivity of searches for new phenomena with a high mass scale greatly benefited from the energy increase with respect to the LHC run-1 data. Events with two hadronic jets in the final state are of particular interest: new phenomena produced in parton collisions are likely to produce...
The electromagnetic calorimeter (ECAL) of the Compact Muon Solenoid Experiment (CMS) is operating at the Large Hadron Collider (LHC) with proton-proton collisions at 13 TeV center-of-mass energy and at a bunch spacing of 25 ns. Challenging running conditions for CMS are expected after the High-Luminosity upgrade of the LHC (HL-LHC). We review the design and R&D studies for the CMS ECAL crystal...
The SoLid experiment intends to search for active-to-sterile anti-neutrino oscillation at very short baseline and perform a precise measurement of the 235U anti-𝜈e spectrum at SCK•CEN BR2 in Belgium. A way to test this hypothesis is to look for distortions of the anti-neutrino energy caused by oscillation from active to sterile neutrino at several close stand-off distances ( ∼ 6-9m) from a...
We carefully study the implications of adiabaticity for the behavior of
cosmological perturbations. There are essentially three similar but
different definitions of non-adiabaticity: one is appropriate for
a thermodynamic fluid $\delta P_{nad}$, another is for a general matter field
$\delta P_{c,nad}$, and the last one is valid only on superhorizon scales.
The first two definitions coincide if...
A precision measurement of jet cross sections in neutral current deep-inelastic scattering for photon virtualities $5.5 < Q^2 < 80$ GeV$^2$ and inelasticities $0.2 < y < 0.6$ is presented, using data taken with the H1 detector at HERA, corresponding to an integrated luminosity of 290 pb$^{−1}$. Double-differential inclusive jet, dijet and trijet cross sections are measured simultaneously and...
After the discovery of a Higgs boson, it is of great importance to study its properties under a minimal set of assumptions. The definition of a fiducial phase-space for the measurement of cross sections allows to minimise uncertainties due to extrapolations and to model dependence. A measurement of the Higgs boson differential fiducial cross sections is performed in several final states,...
The measurement of flow harmonics of charged particles from v_2 to v_7 in Pb+Pb collisions in the wide range of transverse momentum and pseudorapidity provides not only a way to study the initial state of the nuclear collisions and soft particle collective dynamics, but also provides insight into jet quenching via the measurement of flow harmonics at high transverse momenta. The longitudinal...
Results of searches for new physics in the dijet and multijet final states are presented. These include model-independent and model-specific searches using the dijet invariant mass spectrum and the dijet angular distributions, searches for black holes, quantum and microscopic, in multijet events, as well as searches for RPV SUSY in events with paired dijets. This talk focuses on the recent...
Measurements of the cross sections of the production of three electroweak gauge bosons and of vector-boson scattering processes at the LHC constitute stringent tests of the electroweak sector of the Standard Model and provide a model-independent means to search for new physics at the TeV scale. The ATLAS collaboration has recently searched for the production of three W bosons or of a W boson...
The ATLAS detector was designed and built to study proton-proton collisions produced at the LHC at centre-of-mass energies up to 14 TeV and instantaneous luminosities up to $10^{34} \mathrm{cm}^{-2} \mathrm{s}^{-1}$. A liquid argon (LAr)-lead sampling calorimeter is employed as electromagnetic calorimeter and hadronic calorimeter, except in the barrel region, where a scintillator-steel...
The excess of the antiproton flux and the antiproton-to-proton flux ratio beyond the prediction of the collision of ordinary cosmic rays is a unique signal from the Dark Matter model of neutralino annihilation. This excess can not come from pulsars. We present precision measurements by AMS of the antiproton flux and the antiproton-to-proton flux ratio in the absolute rigidity range from 1 to...
We analyze two models in which primordial inflation has non-standard features. In the first model we study the evolution of a system in which the inflaton is slowed down by dissipation of energy into gauge bosons instead of the usual Hubble friction: in particular we study the conditions of the onset of such a scenario from a static field configuration and we briefly mention some difficulties...
The $v_{2}$ and $v_{3}$ anisotropy harmonics of charged particles and prompt $D^{0}$ meson are measured at |y|$\le$ 1 as a function of transverse momentum ($p_{T}$) and centrality classes in PbPb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV collected with the CMS detector. The results indicate that the charm quarks interact strongly with the QGP medium. Comparisons between theoretical predictions...
The latest results on the measurement of the fiducial and differential cross sections of the Higgs boson in the diphoton and 4l decay channels with the ATLAS detector are presented, using approximately 36 fb-1 of pp collision data collected at 13 TeV.
We present measurements of multi-differential Jet cross sections over a wide range in transverse momenta from inclusive jets to multi-jet final states. We present studies on the impact these measurements have on the determination of the strong coupling alphas as well as on parton density functions. We also show angular correlations in multi-jet events at highest center-of-mass energies and...
The high-precision HERA data are used to search for Beyond the Standard Model contributions to electron-quark scattering in the framework of eeqq contact interactions (CI). Combined measurements of the inclusive deep inelastic cross sections in neutral and charged current $ep$ scattering are considered, corresponding to a luminosity of around 1 fb$^{-1}$. The analysis of the inclusive $ep$...
In the recent years, major milestones in neutrino physics were accomplished at nuclear reactors: the smallest neutrino mixing angle $\theta_{13}$ was determined with high precision and the emitted antineutrino spectrum was measured at unprecedented resolution. However, two anomalies, the first one related to the absolute flux and the second one to the spectral shape, have yet to be solved. The...
The production of massive vector boson pairs is a key process for the understanding of the non-abelian gauge structure of the standard model and for the comprehension of the electroweak symmetry breaking mechanism. The study of the production of vector boson pairs with the presence of two jets in the event allows to measure the electroweak production of vector bosons in association with jets,...
LHCb is one of the four main experiments at the Large Hadron Collider (LHC) at CERN, focused on the study of CP violation and rare decays of b and c quarks. The Ring-Imaging Cherenkov (RICH) system is a crucial component of the LHCb experiment providing identification of charged particles over a large momentum range (2-100 GeV/c) and angular acceptance (15-300 mrad). The LHCb RICH performed...
The two-wave quark production scenario can be investigated experimentally by measurements of balance functions of identified particle pairs [1]. By studying the balance functions of several hadronic species, one can gain insight into the chemical evolution of the QGP and radial flow. In a picture of early hadronization, pairs of particles and anti-particles (created at the same spacetime...
The low-energy dynamics of a generic self-gravitating media can be studied by using effective field theory in terms four derivatively coupled scalar fields. Imposing SO(3) internal spatial invariance, the theory describes fluids, superfluids, solid and supersolids. Dynamical and thermodynamical properties of the medium are dictated by internal symmetries of the effective theory. From the...
We study the effects of dimension-six operators on the Higgs decay into
four lepton channel. The calculation of new matrix elements has been
performed in the so-called Higgs basis and it is
implemented in a Monte Carlo event generator.
A mapping between the parameters of the phenomenological Lagrangian
and those of the Warsaw and SILH bases is also implemented.
We consider all the relevant...
A flexible trigger system, excellent vertex locator, invariant mass resolution and forward acceptance allow unique exotica measurements to be performed at LHC energies using data collected with the LHCb detector. A summary of results will be presented, focusing in searches involving low mass dimuon resonances, sensitive to a wide range of New Physics models.
The production of jets at hadron colliders provides a stringent test of perturbative QCD at the highest energies. The process can also be used to probe the gluon density function of the proton. Specific topologies can be used to extract the strong coupling constant.
The ATLAS collaboration has recently measured the inclusive jet production cross section in data collected at a center-of-mass...
We analyze cosmic-ray antiproton observations in the light of dark matter (DM) annihilation in our Galaxy using the recent precise AMS-02 measurements. Taking into account cosmic-ray propagation uncertainties by fitting at the same time DM and propagation parameters we find a significant indication of a DM signal for various annihilation channels in the mass range between 40 and 130 GeV and...
I will discuss the structure of the loop corrections in the case of the non-linear EW effective theory and compare it with the low-energy contributions from the exchange of heavy resonances. The convenience of using either the non-linear HEFT or the linear SMEFT will depend on the interplay of the scales that control these two types of contributions.
DANSS (JINR, Dubna and ITEP, Moscow) is a one cubic meter highly segmented solid scintillator detector.
It consists of 2500 scintillator strips (100x4x1 cm3), covered with
gadolinium loaded reflective coating and read out by SiPMs via wave length shifting fibers. Groups of 50 strips are also read out by conventional PMTs. DANSS is placed under a 3 GW reactor at the Kalinin NPP (Russia) on a...
DarkSide-20k is a proposed 20 tonne fiducial mass liquid argon TPC that will perform an instrumental background-free search for WIMP dark matter. The TPC will be outfitted with more than 125,000 silicon photomultipliers (SiPM) grouped into 5210 single-channel, $25\ {\rm cm}^2$ photosensors that are sensitive to single photoelectrons, and will be filled with low radioactivity Argon extracted...
We show that the dimension of spacetime becomes complex-valued when its short-scale geometry is invariant under a discrete scaling symmetry. This characteristic can arise either in quantum gravities based on combinatorial or multifractal structures or as the partial breaking of continuous dilation symmetry in any conformal-invariant theory. With its infinite scale hierarchy, discrete scale...
We study electroweak baryogenesis driven by up-type heavy quarks in
a general two Higgs doublet model with $CP$ invariant Higgs potential.
With Higgs sector couplings and an additional top Yukawa coupling $\rho_{tt}$
all of $\mathcal{O}(1)$ in strength, one naturally has sizable $CP$ violation
that fuels a cosmic baryon asymmetry. Even if $\rho_{tt}$ vanishes, the flavor violating...
We present results on measurements of characteristics of events with jets, from jet-charge over investigations of shapes to jet mass distributions. The measurements are compared to theoretical prediction including those matched to parton shower and hadronization.
PROSPECT is a reactor antineutrino experiment consisting of a segmented 6Li-loaded liquid scintillator antineutrino detector designed to probe short-baseline neutrino oscillations and precisely measure the reactor antineutrino spectrum. The experiment will be located at the High Flux Isotope Reactor (HFIR) at Oak Ridge National Lab. The three ton detector will be located 7-12 m from the...
In nucleus-nucleus collisions, the Quark-Gluon Plasma behaves like a perfect fluid and the azimuthal anisotropy of the observed particle final-state distributions reflects its properties. This anisotropic flow, arising mainly from initial-state geometry and its fluctuations, highlights the collective behavior of the particles produced in the collision. It is well-described by hydrodynamics and...
The production of a pair of Higgs bosons provides a direct handle on the structure of the Higgs field potential. While the HH production within the SM is very small and essentially out of the experimental reach within the LHC Run II, several beyond SM theories foresee an enhancement that can be already probed with the available data. The latest searches for resonant and non-resonant Higgs pair...
We report on the most recent searches for unknown low-mass states performed with the data collected by the BaBar detector at the PEP-II e+e- collider.
The first search is based on a sample corresponding to 53 fb−1 of e+e− collision data collected with a special single-photon trigger. We look for events with a single high-energy photon and a large missing momentum and energy, consistent with...
Many new physics models, e.g., compositeness, see-saw, and extra dimensions models, are expected to manifest themselves in the final states with leptons and photons. This talk presents searches for new non-resonant phenomena in the final states that include leptons and photons, focusing on the recent results obtained using data collected during the 2016 run.
The direct observation of high-energy cosmic rays, up to the PeV region, will depend on highly performing calorimeters, and the physics performance will be primarily determined by their geometrical acceptance and energy resolution.Thus, it is fundamental to optimize their geometrical design, granularity, and absorption depth,with respect to the total mass of the apparatus, probably the most...
The angular correlation function (CF) refers to the correlation of particles in the relative pseudorapidity and relative azimuthal angle. It is used to study strongly interacting matter properties at relativistic energies. Recent results from the ALICE experiment at LHC show unexpected structures of CF in the proton-proton and antiproton-antiproton correlations. Also results from the STAR...
I will describe the physical mechanisms and the actual bounds that CMB anisotropy studies put on primordial black holes, notably if they constitute a sizable fraction of dark matter. Both mass-independent gravitational effects (linked to mergers) and mass-dependent ones (due to electromagnetic energy injection) will be covered. I will also briefly comment on the complementarity of other...
The large equivalent-photon fluxes accompanying Pb ion beams at the LHC initiate photon-photon and photo-nuclear interactions which dominate when the colliding nuclei have large impact parameter (ultra-peripheral collisions). These electromagnetically-induced processes are sensitive to the nuclear wave-function and in particular the nuclear modifications of the nucleon parton distribution...
We compute cross section for the production of three jets in electron-positron annihilation at next-to-next-to-leading order (NNLO) accuracy. We use a general subtraction scheme developed for computing QCD jet cross sections in perturbation theory. This method is implemented in the Monte Carlo for the CoLoRFulNNLO Subtraction Method (MCCSM) program that provides a general framework for...
An enhanced production of two Higgs bosons would be a clear sign of beyond Standard Model physics. A search is performed for resonant and non-resonant excess production, including several decay channels of the two Higgs bosons. The analysis uses about 36 fb-1 of p-p collisions at 13 TeV.
Many theories beyond the Standard Model predict new phenomena which decay to well isolated, high-pt leptons. Searches for new physics models with these signatures are performed using the ATLAS experiment at the LHC. The results reported here use the pp collision data sample collected in 2015 and 2016 by the ATLAS detector at the LHC with a centre-of-mass energy of 13 TeV.
The SOX project aims at searching eV scale sterile neutrinos by means of a powerful anti-neutrino source located very close to the Borexino detector at the Gran Sasso Laboratory in Italy
The source will be made with a sample of Ce-144 completely shielded by a thick tungsten container and will be located at 8.25 m from the center of the Borexino detector. The total activity will be around 150...
In an accelerating universe a maximum radius exists above which a shell of test particles cannot collapse and disperses due to the cosmic expansion. Observations of this turnaround radius for large structures could constrain the
effective equation of state of dark energy. We use the Hawking quasilocal mass to make the concept of turnaround radius well defined in general relativity and
then we...
Silicon Photomultipliers (SiPM) are standard sensors widely employed for applications in which high sensitivities and fast responses in the detection of low fluxes of visible and UV photons are required.
The Italian Institute of Nuclear Physics (INFN), in collaboration with Fondazione Bruno Kessler (FBK), is involved in a R&D project for SiPM sensors sensitive to near UV wavelengths.
The...
We will report on our results for light-by-light scattering in
ultraperipheral Pb-Pbcollisions at the LHC.
We calculate cross section for the elementary $\gamma \gamma \to \gamma \gamma$
subprocess taking into account the following contributions:
(a) box mechanisms with leptons and quarks in the loops,
(b) VDM-Regge mechanism (fluctuation of both photons to vector mesons
and their...
High Energy Factorisation was applied so far almost exclusively to Deep Inelastic Scattering process, as computing gauge invariant matrix elements with off shell external legs is a highly non trivial task. In recent years, this problem has been completely solved in a variety of ways, both analytically and numerically. The times are mature to produce the first phenomenological predictions.
We...
We revisit the decoupling effects associated with heavy particles in the renormalization group running of the vacuum energy in a mass-dependent renormalization scheme. We find the running of the vacuum energy stemming from the Higgs condensate in the entire energy range and show that it behaves as expected from the simple dimensional arguments meaning that it exhibits the quadratic sensitivity...
Direct dark matter searches are promising techniques to identify the nature of dark matter particles. A variety of experiments have been developed over the past decades, aiming to detect Weakly Interactive Massive Particles (WIMPs) via their scattering in a detector medium. Exploiting directionality would also give a proof of the galactic origin of dark matter making it possible to have a...
The exploration of the QCD phase diagram is the most important task of present heavy ion experiments. In particular, we want to study the phase transition from hadronic to partonic matter and look for the critical point (CP) of strongly interacting matter. Fluctuations and correlations in kinematic characteristics and particle yields may help to locate the CP (in analogy to enlarged...
In the Standard Model of the Electroweak Interactions the value of the
Higgs trilinear self-coupling is predicted from its relation to the
Higgs mass and the Fermi constant. However, the experimental
verification of this prediction through the measurement of the double
Higgs production is extremely challenging.
I present the possibility of probing an anomalous trilinear coupling
indirectly,...
Numerous new physics models, e.g., theories with extra dimensions and various gauge-group extensions of the standard model, predict the existence of new particles decaying to leptons and photons. This talk presents CMS searches for new resonances in the dilepton, lepton+MET, diphoton, and other final states that include leptons and photons, focusing on the recent results obtained using data...
The JSNS2 experiment aims to search for the existence of neutrino
oscillations with Delta m2 near 1eV2 at the J-PARC Materials
and Life Science Experimental Facility (MLF). With the 1 MW of 3 GeV
proton beam created by Rapid Cycling Synchrotron (RCS) and spallation
neutron target, an intense neutrino beam from muon decay at rest is
available....
The emergence of the Chiral Magnetic Effect (CME) and the related anomalous current is investigated using the real time Dirac-Heisenberg-Wigner formalism. This method is widely used for describing strong field physics and QED vacuum tunneling phenomena as well as pair-production in heavy-ion collisions. We extend earlier investigations of the CME in constant flux tube configuration by...
In this presentation the R&D of a gas detector prototype for high precision tracking of low energy nuclear recoils over large gas volumes will be presented.
In our prototype, the scintillation light accompanying the electronic avalanches in a triple GEM structure is detected by a CMOS-based camera through a suitable lens. The CMOS sensors provide a very high granularity along with a very low...
Recent results on the resummation of soft gluon corrections to the $pp \rightarrow t \bar{t} H$ cross section at the LHC will be presented. The resummation was carried out at next-to-next-to-leading-logarithmic (NNLL) accuracy using the Mellin space technique and matched to the NLO cross section. The process probes directly the top-Higgs Yukawa coupling that may be particularly sensitive to...
Clusters of galaxies are unique cosmological probes sensitive to the primordial density fluctuations, and the expansion history and energy content of the Universe. The thermal Sunyaev-Zeldovich (tSZ) effect is an observable of choice for cluster cosmology due tothe low scatter in the relationship between SZ flux and cluster mass, and the construction of large tSZ selected cluster catalogs by...
In this presentation, we review the general features of integrand-reduction techniques with a particular focus on their generalization beyond one loop. We briefly summarize the ongoing efforts in the field, whose ultimate goal is the development of efficient alternative computational techniques for the evaluation of Feynman integrals beyond one loop. Finally, we describe some recent...
In composite Higgs models, new composite pseudo-scalars (as an $\eta$ or an $\eta^{\prime}$-like state) can interact with the Higgs and with gauge bosons via anomalous interactions, which stem from the topological structure of the theory. A future 100 TeV pp collider (FCC) will be able to test these anomalous interactions and thus to shed light on the strong dynamics which generates the Higgs...
Three-flavour neutrino oscillations have proved very successful in describing the observed neutrino oscillation data. However, there are also some anomalies, including the excesses of appeared electron neutrino interactions in LSND and MiniBooNE, and a sterile neutrino state at a larger mass-splitting scale can provide an explanation for these results.
The MINOS/MINOS+ experiment was a...
LHCb, while purpose built for b-physics, also functions as a general purpose forward detector, covering the pseudo-rapidity range 2.0 to 5.0. LHCb has measured forward top production using final states accessible from both single top and top pair production processes. Measurements in the LHCb acceptance have particular sensitivity to high and low values of Bjorken-x when compared to other LHC...
In this contribution we will present the progresses toward the construction of a silicon tracking system able to measure the passage of charged particles with a combined precision of ∼ 10 ps and ∼ 10 μm, either using a single type of sensor, able to concurrently measure position and time, or a combination of position and time sensors.
The recent development of controlled multiplications in...
I present our work on simulating the Glasma in the early stages of heavy ion collisions in a non-boost-invariant setting. Our simulation is based on the colored particle-in-cell method, which is used to numerically solve the Yang-Mills equations in 3+1 dimensions. This approach allows us to describe colliding nuclei with finite longitudinal width by extending the McLerran-Venugopalan model to...
Cosinus is a R&D project aiming for the cryogenic operation of NaI-crystals to search for elastic dark matter scattering. NaI-crystals are scintillating and
the combined measurement of the scintillation light and the phonon signal allows a precise measurement of the deposited energy and a good separation between signal and background events. However, NaI is hygroscopic and requires a special...
Latest 13 TeV results of CMS searches regarding the Higgs boson production in association with top quarks will be presented. This talk will cover the different CMS analyses covering the main Higgs boson decay modes (gamma gamma, ZZ, WW, and tautau).
In this presentation I will talk about QUBIC, an experiment that takes up the challenge posed by the detection of primordial gravitational waves with a novel approach. Detecting the signature left by primordial gravity waves in the Cosmic Microwave Background (CMB) entails measuring a tiny polarized component of the CMB, the so-called B-modes, that is literally buried in polarized...
New Physics searches at colliders are usually conceived as the search of excesses in the number of events at a certain kinematic region. We emphasize that, whenever the process under study is mediated by a non-scalar particle, the final-state angular distribution has extra information related to the spin state of the mediator. We apply this
idea to the W and Z bosons at LHC, showing that...
Measurements of the inclusive and differential top-quark pair and single-top production cross sections in proton-proton collisions with the ATLAS detector at the Large Hadron Collider at center-of-mass energies of 8 TeV and 13 TeV are presented. The inclusive measurements reach high precision and are compared to the best available theoretical calculations. Differential measurements of the...
At present most experiments at the CERN Large Hadron Collider (LHC)
are planning upgrades in the next 5-10 years for their innermost
tracking layers as well as luminosity monitors to be able to take data
as the luminosity increases and CERN moves toward the High Luminosity-LHC
(HL-LHC). These upgrades will most likely require more radiation
tolerant technologies than exist today. As a result...
The product of the gluon dressing function and the square of the ghost dressing function in the Landau gauge can be regarded to represent, apart from the inverse power corrections $1/Q^{2n}$, a nonperturbative generalization $A(Q^2)$ of the perturbative QCD running coupling $a(Q^2)$ ($\equiv \alpha_s(Q^2)/\pi$). Recent large volume lattice calculations for these dressing functions strongly...
Measurements of the inclusive and differential top quark pair production cross section in proton-proton collisions at 5.02 TeV, 7 TeV, 8 TeV and 13 TeV are presented using the CMS detector. The total cross section is measured using the lepton+jets, dilepton and fully hadronic channels, including the tau-dilepton and tau+jets modes. Indirect constraints on both the top quark mass and ɑS are...
DARWIN (DARk matter WImp search with liquid xenoN) will be an experiment
for the direct detection of dark matter using a multi-ton liquid xenon time projection chamber. The first goal of Darwin will be to look for Weakly Interacting Massive Particles (WIMPs) pushing the sensitivity until the background of natural sources of neutrinos will be the dominant background. DARWIN's excellent...
In the idealized high-energy limit of heavy-ion collisions, the system right after collisions is described as an over-occupied gluonic plasma expanding in the longitudinal direction, which is called Glasma. The understanding of the quark dynamics in such a pre-equilibrium state is of prime importance as it has a direct connection to electromagnetic probes such as photons. We report on a...
As the Planck mission is delivering its ultimate results, it has become clear that much is still to be learnt from additional observations of the Cosmic Microwave background. In the light of current results and remaining questions, I will discuss the scientific case of some of the main future CMB projects, their complementarity, and how to address the challenges of measurement accuracy and of...
The associated production of the Higgs boson with top quarks should allow the direct observation of the coupling of the Higgs boson to top quarks. The channel also benefits for a large cross-section increase between 8 and 13 TeV. ATLAS results in the search for the Higgs boson in the ttH production mode based on about 36fb-1 collected data will be presented.
SBND (Short-Baseline Near Detector) is a 112 ton liquid argon TPC neutrino
detector under construction on the Fermilab Booster Neutrino Beam.
Together with MicroBooNE and ICARUS-T600, SBND will search for shortbaseline neutrino oscillations in the 1 $eV^2$ mass range. SBND will also perform
detailed studies of the physics of neutrino-argon interactions, thanks to a data
sample of millions of...
Proposed more than 30 years ago, axions are still the most compelling solution to the strong CP problem of the Standard Model. More recently their physics case has been considerably sharpened, as well as that of similar axion-like particles (ALPs) that generically emerge in diverse high-energy extensions of the Standard Model, notably string theory. Both axion and ALPs constitute very...
I will present an overview of the final results from the SDSS-III BOSS analysis (DR12). Using the galaxy power spectrum and correlation function, BOSS was able to measure the Baryon Acoustic Oscillations scale in two independent redshift bins to 1% precision. Such constraints allow to map out the expansion history of the Universe and represent one of the most important cosmological tools at...
We show the results of our recent global analysis of EPPS16 NLO nuclear parton distribution functions (nPDFs). For the first time, dijet and heavy gauge boson production data from LHC proton–lead collisions have been included in a global fit. Especially, the CMS dijets play an important role in constraining the nuclear effects in gluon distributions. With the inclusion of also neutrino–nucleus...
We present state-of-the-art, high-precision predictions for top-quark pair production in the di-lepton channel at the LHC.
Our results are based on the narrow-width approximation and include approximate NNLO corrections in the production subprocess, exact NNLO corrections in the decay sub-process as well as exact NLO-production/NLO-decay interferences.
We will briefly outline the structure...
Latest 13 TeV results of CMS searches for the Higgs boson produced in association with top quarks and decaying to b quarks will be presented. This talk will include the first CMS results for the fully hadronic channel with the matrix element method as well as the semi-leptonic and di-leptonic channels with the matrix element method and BDT discriminant.
Torsion models constitute a well known class of extended quantum gravity models. In this work, one investigates phenomenological consequences of a torsion field interacting in different ways with top quarks at LHC. A torsion field could appear as a new heavy state characterized by its mass and couplings to fermions. This new state would form a resonance decaying into a top anti-top pair. ...
One of the hottest topics in present-day neutrino physics is provided by the hints of sterile species coming from the short-baseline (SBL) anomalies.
Waiting for a definitive (dis-)confirmation of these indications by future
SBL experiments, other complementary avenues can be explored in the
hunt of such elusive particles. An important opportunity is that offered by the
long-baseline (LBL)...
Combined HERA data on charm production in deep-inelastic scattering
have previously been used to determine the charm-quark running mass
$m_c(m_c)$ in the MSbar renormalisation scheme.
Here, the same data are used as a function of the photon virtuality $Q^2$
to evaluate the charm-quark running mass at different scales to one-loop
order, in the context of a next-to-leading order QCD...
With the growing diffusion of resistive Micromegas detectors in HEP experiments the study of long-term aging behaviour is becoming more and more relevant.
Two resistive bulk-Micromegas detectors were installed in May 2015 at the CERN Gamma Irradiation Facility exposed to an intense gamma irradiation with the aim to study the detector behavior under high irradiation and the long-term...
Electroweak bosons do not interact strongly with the dense and hot medium formed in nuclear collisions, and thus are sensitive to the nuclear modification of parton distribution functions (nPDFs). The ATLAS detector, optimised to search for new physics in proton-proton interactions, is well equipped to measure photons, W and Z bosons in the high occupancy environment produced in heavy-ion...
The high precision HERA combined measurement of inclusive deep inelastic cross sections in neutral and charged current $ep$ scattering, corresponding to a luminosity of about 1 fb$^{-1}$, permits searches for new contributions to electron-quark scattering beyond the Standard Model up to TeV scales. A new approach to beyond the Standard Model analysis of the inclusive ep data is presented;...
The Baryon Oscillation Spectroscopic Survey (BOSS) of SDSS-III has ushered in a new era for high-redshift quasar surveys studying the large-scale structure of the Universe through intervening absorption by the intergalactic gas. The unprecedented number of quasar absorption spectra provided by BOSS allows us to measure the expansion rate and geometry of the Universe at redshift z>2 using...
The latest results of searches for the Standard Model Higgs boson produced in association with a single top quark (tHq, tHW) are presented. The analyses have been performed using the 13 TeV pp collisions data recorded by the CMS experiment in 2015 and 2016.
Measurements of single top-quark production in proton-proton collisions are presented based on the 8 TeV and 13 TeV ATLAS datasets. For the production of single top-quarks and single anti-top-quarks in the t-channel, the total production cross sections, their ratio, as well as measurements of inclusive and differential cross-sections are presented. Measurements of the inclusive and...
The 760 ton liquid argon ICARUS T600 detector performed 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 in cosmic rays. A sensitive search for LSND like anomalous nu_e appearance was performed, contributing to constrain the allowed parameters to a...
We determine the charm quark mass $m_c(m_c)$ from QCD sum rules of moments of the vector current correlator calculated in perturbative QCD. Only experimental data for the charm resonances below the continuum threshold are needed in our approach, while the continuum contribution is determined by requiring self-consistency between various sum rules, including the one for the zeroth moment....
A prototype of a luminometer, designed for a future e+e− collider detector, and consisting at present of a four-plane module, was tested in the CERN PS accelerator T9 beam. The objective of this beam test was to demonstrate a multi-plane operation, to study the development of the electromagnetic shower and to compare it with MC simulations. In addition, the effective Molière radius of this...
Type Ia supernovae (SNe Ia) have proved to be a successful probe of dark energy thanks to their property of standardizable candle allowing us to construct a supernova Hubble diagram with very low scatter through a two-parameter empirical light-curve correction. However, 0.15 magnitude intrinsic luminosity variation remains once corrections are applied, leaving plenty of room for a third...
The Daya Bay Reactor Neutrino Experiment currently holds for the most precise measurement of the third neutrino mixing angle θ13~8.4^o, which unlocked the gateway of studying the CP violation in the lepton sector, and the most precise measurement of |Δm^2_32|. The multiple detectors at different locations also allow for using relative energy spectral analysis to search for a light sterile...
Several measurements of single top quark production in proton-proton collisions at the LHC at centre-of-mass energies of 7, 8 and 13 TeV, using data collected with the CMS experiment, are presented. The analyses investigate separately the productions of top via t-channel exchange, in association with a W boson (tW) or via the s-channel. Final states with at least one charged lepton and one...
Beams of relativistic heavy ions accompanied by a large flux of equivalent photons, and photon-induced reactions are the dominant interaction mechanism in heavy-ion collisions when the colliding nuclei have transverse separation larger that the nuclear diameter. In these ultra-peripheral collisions (UPC) the photon can provide a clean probe of the partonic structure of the nucleus analogous...
Dark matter axions can generate peculiar effects in special types of Josephson junctions, so-called SNS junctions [1]. One can show that the axion field equations in a Josephson environment allow for very small oscillating supercurrents, which manifest themselves as a tiny wiggle in the I-V curve, a so-called Shapiro step, which occurs at a frequency given by the axion mass. The effect is very...
We present the results of a CMS search for a new Higgs boson-like resonance decaying into two photons in proton-proton collisions. We search for an excess of events over the standard model background prediction in the diphoton invariant mass spectrum.
Multijet processes have always been hard to model precisely in hadron collisions, and reliance of experimental studies and searches on Monte Carlo simulations has been problematic, at times resulting in controversies and retractions. Nowadays matrix-element-based tools can accurately predict the general features of energetic collisions producing several hadronic jets, yet often the huge...
Motivated by the possible signals of lepton number violation in B physics, known as RD(*) and RK, RK$^*$ puzzles, we investigate whether
charm physics might offer a window to New Physics, too.
Relying on the existing lattice QCD and experimental results on charm leptonic and semileptonic weak decays, one can question presence of NP in the charge current transitions.
One can constrain the...
Gravitational lensing represents a unique tool to study the dark Universe. In the weak lensing regime small distortions in the images of galaxies caused by the large-scale structure can be detected over the whole sky. Measuring these coherent distortions yields cosmological insights complementary to other probes like the cosmic microwave background (CMB). Ongoing wide-field imaging surveys...
The exhibition "The beginning of everything ", which runs from October 2016 to August 2017, has been created in collaboration between the Natural History Museum Vienna and the Institute of High Energy Physics (HEPHY) of the Austrian Academy of Sciences and was visited by more than 300 000 people including about 120 000 children and youth until mid-March2017. „The beginning of everything“...
I will review the recent developments in the understanding of the dynamics of jets that propagate through QGP with particular emphasis on jet substructure. I will argue that substructure observables provide a novel direction in quenching studies.
Many supersymmetry models feature gauginos and also sleptons with masses less than a few hundred GeV. These can give rise to direct pair production rates at the LHC that can be observed in the data sample recorded by the ATLAS detector. The talk presents results from searches for gaugino and slepton pair production in final states with leptons, and were performed with pp collisions at a...
The LHC did not discover new particles beyond the Standard Model Higgs boson at 7 and 8 TeV, or in the first data samples at 13 TeV. However, the complementary nature of physics with e+e- collisions still offers many interesting scenarios in which new particles can be discovered at the ILC. These scenarios take advantage of the capability of e+e- collisions to observe particles with missing...
The study of Higgs boson properties form an important part of the LHC program. These studies are not only important for a better understanding of electroweak symmetry breaking mechanism but also for BSM searches. For example, most recently a strategy has been proposed to use LHC measurements of the Higgs transverse momentum distribution to constrain the Yukawa couplings of light-generation...
I will discuss the top-quark mass determination at the LHC, according to the
different methods used by the experimental collaborations.
In particular, I will investigate the theoretical uncertainty on the measured mass,
once interpreted in terms of the top-quark pole mass, taking particular
care about non-perturbative corrections due to bottom fragmentation in top decays.
The Compact Linear Collider (CLIC) is an option for a future
electron-positron collider operating at centre-of-mass energies from a
few hundred GeV up to 3 TeV. This contribution discusses the Higgs and
BSM physics reach of CLIC operating in several energy stages. The
presented results are based on physics benchmark analyses using full
detector simulations, several of which have been completed...
With over 3,000 members from 178 institutes, the ATLAS Collaboration is naturally diverse. However, capturing this diversity through pictures can be a challenge. Photography is a powerful tool, allowing us to reveal the faces behind a story and give the public the unique opportunity to understand and appreciate the human aspects of ATLAS’s scientific research.
The role of photographs in...
We report on searches for supersymmetry via pair production of partners of electroweak gauge and Higgs bosons. The searches use proton-proton collision data recorded in 2016 by the CMS experiment at the LHC. The results are interpreted in terms of several simplified models of supersymmetry.
The Dark Energy Survey (DES) is a large galaxy survey designed to address the fundamental question of the accelerating expansion of the universe and uncover the nature of the dark energy. It started the data taking in 2013, providing high quality imaging for 1/8 of the sky. The talk will present the current status of the project and the most recent results, mainly based on data from the first...
We perform a comparative analysis of constraints on sterile neutrinos from the Planck experiment and from current and future neutrino oscillation experiments (MINOS, IceCube, SBN). For the first time, we express the Planck constraints on Neff and msterileeff from the Cosmic Microwave Background in the parameter space used by oscillation experiments using both mass-squared differences and...
Science education research suggests that STEM learning for young students may be especially enhanced through the combined use of inquiry and creativity in formal and informal settings. Consistent with the increasing emphasis on interdisciplinarity and the integration of the arts into STEM instruction (from STEM to STEAM), the CREATIONS initiative within the HORIZON-2020 framework brings...
We report the most recent measurements of the mass of the the top quark, performed by the D0 experiment at the Fermilab Tevatron collider using the full Run II (2001--2011) data set corresponding to an integrated luminosity of $9.7\ $fb$^{-1}$. This includes measurements in the dilepton channels using the matrix element and neutrino weighting approaches, as well as measurements in the...
The Esa satellite Euclid will launch in 2020. It will observe 15000deg2 of the darkest sky with his visible imager and his near-IR photometer and spectrograph.
The core science goal of the mission is to measure the evolution of the expansion of the universe up to redshift 2 in order to characterise deviations from the concordance LambdaCDM model, determine the evolution properties of dark...
High energy collisions of heavy nuclei permit the study of nuclear matter at temperatures and energy densities. Under these conditions the fundamental theory for strong interactions, QCD, predicts a phase transition to a plasma of quarks and gluons. This matter, called a Quark Gluon Plasma (QGP), has been studied experimentally for the last decade and has been observed to be a strongly...
The COMPASS experiment at CERN has performed a rich programme in inclusive and semi-inclusive deep inelastic scattering of longitudinally polarised muons off longitudinally, transversely polarised and unpolarised nucleons. The main topic is the investigation of the spin structure of the nucleon in terms of quark and gluons, both through accessing the spin dependent collinear parton...
We study the nature of the flavor changing neutral couplings of the top quark with the Higgs boson and the up/charm quark in the tt¯ production at linear colliders. There are previous bounds on such tqH couplings at both, linear and hadronic colliders, with the assumption that it couples equally to the left and the right handed fermions. In this paper we examine the chirality of the tqH...
We report on searches for new physics in events with at least one photon, jets and missing transverse energy. The searches use proton-proton collision data recorded in 2016 by the CMS experiment at the LHC. The results are interpreted in terms of several simplified models of supersymmetry.
Measurements of the top quark mass and width using proton-proton collisions at the LHC at centre-of-mass energies of 7, 8 and 13 TeV are presented. The analyses used different decay channels and production modes of the top quark. Several techniques are investigated based on the reconstruction of the top kinematics from final state products, using leptonic decays with a J/psi, the shapes of top...
In 2015 the COMPASS collaboration at CERN studied the Drell-Yan process with a 190 GeV/c π− beam on a transversely polarized ammonia target. From single-spin asymmetries COMPASS was able to determine amplitudes related to the proton Sivers, transversity and pretzelosity transverse momentum dependent (TMD) distributions. The most notable of these TMDs is the Sivers function which has...
CREATIONS is a three-year long European Union funded project, which aims to increase the young people’s interest in science. Sixteen partners from ten European countries develop creative approaches based on science and art for an engaging science classroom. The project is now in its 2nd year and a variety of events have already taken place. We have been developing advanced digital tools and...
In relativistic heavy-ion collisions, a hot medium with a high density of unscreened colour charges is produced. Jets are produced at the early stages of this collision and are known to become attenuated as they propagate through the hot matter. One manifestation of this energy loss is a lower yield of jets emerging from the medium than expected in the absence of medium effects. Another...
The Large Synoptic Survey Telescope (LSST) is an automated ground-based 8.4m optical telescope, whose first observations are expected in 2023. The aim of this new instrument is to conduct a ten year wide and deep imaging survey of 18,000 square degrees of the sky in six broad optical bands, with a deep stack reaching magnitude $r=27.5$. The LSST design is driven by four science themes: dark...
The plan for the International Linear Collider is now being prepared as a staged design, with the first stage at 250 GeV and later stages achieving the full project specifications with 4 ab-1 at 500 GeV. This talk will present the capabilities for precision Higgs boson measurements at 250 GeV and their relation to the full ILC program. It will show that the 250 GeV stage of ILC will...
R-parity violation introduces new signatures to be considered in the search for supersymmetry at the LHC. Strongly interacting resonances may decay to jets, sleptons may decay via lepton-flavour violating processes and lightest supersymmetric particles may decay into many particles with or without missing transverse momentum. The talk presents recent results from searches of supersymmetry in...
The goal of the KArlsruhe TRItium Neutrino experiment (KATRIN) is to investigate the neutrino mass with a sensitivity of $0.2\,\mathrm{eV/c^{2}}$ by a high-resolution and high-statistics measurement of the end-point region of the $^{3}$H $\beta$-spectrum. The $\beta$-electrons start in the windowless gaseous tritium source and go into a differential and a cryogenic pumping section....
The BESIII Experiment at the Beijing Electron Positron Collider
(BEPCII) accumulated the world's largest e+e- collision samples
at Ecm = 3.773, 4.009, 4.18 GeV. Based on analyses of D(s)+ to l+v
(l=mu, tau), D -> K(pi)l+v (l=e or mu), D+ -> K-pi+e+v, D0(+) ->
f0(980)e+v, Ds+ -> eta(')e+v, we report the determinations of CKM
matrix elements |Vcs(d)|,the D(s)+ decay constants, the form...
I will present the first global fit results for supersymmetric models using the new Global And Modular BSM Inference Tool (GAMBIT). With GAMBIT we have performed fits of the GUT-motivated CMSSM, NUHM1 and NUHM2 models, as well as the weak-scale MSSM7, extending existing results in terms of the number of observables included, scanning techniques and treatment of nuisance parameters.
The GERDA (GErmanium Detector Array) experiment, located at the Laboratori Nazionali del Gran Sasso, is searching for neutrinoless double beta ($0\nu\beta\beta$) decay of $^{76}Ge$. Since the end of 2015, in Phase II of the experiment, 35 kg of enriched high-purity germanium detectors are operated in liquid argon, that serves as cooling for the detectors as well as active shield against...
After the Higgs boson discovery, the precision measurements and searches for new phenomena in the Higgs sector are among the most important goals in particle physics. Experiments at the Future Circular Colliders (FCC) are ideal to study these questions. Electron-positron collisions up to an energy of 350 GeV (FCC-ee) provide the ultimate precision with studies of Higgs boson couplings, mass,...
We study the gluon distribution produced via successive medium-induced branchings
by an energetic jet propagating through a weakly-coupled quark-gluon plasma. We show that
under suitable approximations, the jet evolution is a Markovian stochastic process,
which is exactly solvable. For this process, we construct exact analytic solutions
for all the n-point correlation functions describing the...
The top quark mass is one of the fundamental parameters of the Standard Model. The latest ATLAS measurements of the top quark mass in top quark pair and single top final states are presented. A measurement using lepton+jets top-quark pair events is presented, where a multi-dimensional template fit is used to constrain the uncertainties on the energy measurements of jets. The measurement is...
This talk will present the status of the Advanced LIGO and Advanced Virgo detectors, a year after the first detections of gravitational waves emitted by two binary black hole coalescences. After a 10-month break due to upgrades, maintenance and commissioning, the Advanced LIGO detectors started their second ?Observation Run? (O2) on November 30th 2016. This data taking period is expected to...
The junior community in ALICE at the LHC, consisting of early-career scientists, forms an important and active body within the collaboration. It organizes a rich program with analysis tutorials and physics publication discussions. It also provides a collegial atmosphere for junior scientists to present their work and have lively discussions. In addition, the group is a vital element for junior...
The Large Hadron-electron Collider LHeC and the Future Circular Collider in electron-hadron mode FCC-eh will provide electron-proton collisions with center-of-mass energies in the range 1.3-3.5 TeV and instantaneous luminosities larger than $10^{34}$ cm$^{-2}$s$^{-1}$. With integrated luminosities of about 1 ab$^{-1}$, they provide large samples of Standard Model Higgs bosons in both neutral...
The precision measurement of the anomalous magnetic moment of the muon presently exhibits a 3.5σ discrepancy with the Standard Model (SM) prediction. In the next few years this measurement will reach an even higher precision at Fermilab and
J-PARC. While the QED and electroweak contributions to the muon g-2 can be determined very precisely, the leading hadronic (HLO) correction is affected by...
We present an alternative approach to the direct measurements of the top quark mass using D0 data. We discuss extractions of the pole mass of the top quark based on measurements of the inclusive and unfolded differential $p\bar p \to t\bar t$ production cross section as a function of $p_T(t)$ and $t\bar t$ mass.. We use the full Run II data set of $p \bar p$ collisions collected by the D0...
ATLAS and CMS have performed a large number of searches for physics beyond the Standard Model (BSM). The results of SUSY searches are typically interpreted in the context of Simplified Models. While mass limits obtained in this manner are highly model dependent, cross section upper limits (or efficiency maps) may be used to obtain constraints on generic BSM scenarios without any further event...
Understanding the energy loss of strongly interacting particles is of utmost importance for studying the quark‐gluon plasma (QGP). This very hot and dense state of matter is created during heavy‐ion collisions, like the ones performed at the LHC. As the lifetime of the QGP is very brief, special probes are necessary to study it. One of them consists in focusing on the energy loss of energetic...
The detection of gravitational waves from the merger of binary black holes during the first Advanced LIGO science runs has opened up a new field of astronomy, and a new window on the universe. During these runs, searches for different types of compact binaries are conducted. In this talk, I will review the detected black hole mergers, and discuss the implications of the non-detection of other...
The Cryogenic Underground Observatory for Rare Events (CUORE) is the first bolometric experiment searching for neutrinoless double beta decay that has been able to reach the 1-ton scale. The detector consists of an array of 988 TeO2 crystals arranged in a cylindrical compact structure of 19 towers. The construction of the experiment and, in particular, the installation of all towers in the...
The vast majority of high-energy physicists use and produce software every day. Software skills are usually acquired "on the go'' and dedicated training courses are rare. The LHCb Starterkit is a new training format for getting LHCb collaborators started in effectively using software to perform their research. The initiative, combining courses and online tutorials, focuses on teaching basic...
We present the con?guration in which a quark-antiquark pair with a fi?xed opening
angle emits a hard gluon inside a medium, and an additional very soft emission afterwards (double antenna). We discuss the coherence effects in terms of the survival probability, which describes the interaction of the quark-antiquark-gluon system with the medium. We generalize previous studies of the antenna...
Educational research has shown that girls are less likely than boys to take up science subjects in high school, in western countries, as shown e.g. by a UK [study][1] by the Institute of Physics. This has repercussions on professional choices made later.
For some years now CERN drives a variety of communication, education and outreach activities to encourage girls to take science subjects in...
In this talk I will give the theory overview for new long-lived particles at the LHC. I will describe some of the motivations including neutral naturalness and dark matter. I will also discuss some particularly spectacular signatures where current searches have limited sensitivity and where a joint experimental and theoretical effort to design new search strategies could result in discovery.
Overview of recent developments in the PDF field (new PDF sets, new directions), focusing on the most urgent challenges in the PDF fits and the PDF needs
from a point of view of an experimental physicists, for both precision observables and new physics searches.
I review the status of the top quark couplings studies. The discussion is focused on anomalous electroweak interactions, which are largely unconstrained by hadron collider experiments. Possible anomalous interactions in Quantum Chromodynamics are reviewed, as well. In addition to hadron collider experiments, I discuss constraints from B-physics experiments and future colliders.
The next to MSSM theory predicts the existence of a light pseudoscalar boson "a", and the decay of the Higgs boson into a pair of such particles. This scheme is searched for in several final states relative to different decay modes of the "a" particle, using about 10 fb-1 of p-p collisions at 13 TeV.
The observations of the presumed binary black hole coalescences GW150914 and GW151226 during the first observing run of Advanced LIGO have allowed us to probe the genuinely strong-field dynamics of Einstein's general theory of relativity (GR) for the first time. We give a brief overview of the tests carried out on the detected signals, which showed consistency with GR within the measurement...
NEXT (Neutrino Experiment with a Xenon TPC) aims to observe the neutrinoless double beta decay of Xe-136 in a high-pressure gas xenon Time Projection Chamber using electroluminescence to amplify the signal from ionization. The two main advantages of this technology are a high energy resolution and the possibility of reconstructing the electron tracks in events with energies close to the...
Time-dependent CP-violation measurements allows to determine the mixing-induced CP-violating phases phi_s and beta. The measurement of the phase phi_s in the Bs-Bsbar system is one of the key goals of the LHCb experiment. It has been measured at LHCb exploiting the Run I data set and using several decay channels. In particular, the most recent Run I results that will be presented at this...
Gravitational-wave astronomy has made a tremendous stride forward with detections during the first observing run of the Advanced Laser Interferometer Gravitational-wave Observatory (LIGO). The signals have been identified as originating from the merger of black holes, whose parameters it was possible to infer. This discovery has profound implications. Gravitational waves provide information on...
We report on double inclusive jet production in Pb-Pb collision within newly constructed framework combining High Energy Factorization with mechanism for energy loss in Quark Gluon Plasma. The framework allows for exact treatment of kinematics of colliding partons and therefore to increase accuracy in studies of energy loss of jets in quark gluon plasma. Furthermore the chosen configuration of...
The violation of CP symmetry is well established nowadays in the K and B mesons sectors. However CPV has not been observed in the baryonic sector. Charmless b-baryon decays represent a promising opportunity in this respect since their amplitudes receive contributions from tree level diagrams where the CKM element Vub appears. In addition, these decays are sensitive to possible physics beyond...
The LHCb Collaboration created an office with a mandate to advise and assist on issues related to Early Career, Gender & Diversity (ECGD) in September 2014.
This includes several activities within the Collaboration:
- Helping early-career physicists succeed, both in Academia and outside HEP; e.g. setting up a mentoring programme within the collaboration, and organizing meetings with external...
The SNO+ experiment has multiple physics goals among which the search for neutrinoless double-beta decay, the study of solar neutrinos, measurements of anti-neutrinos from nuclear reactors and the Earth's natural radioactivity, as well as the detection of Supernovae neutrinos. Located in the SNOLAB underground physics laboratory (Canada) it re-uses the SNO detector equipped with ~9300 PMTs and...
Parton distribution functions (PDFs) are crucial ingredients for measurements at hadron colliders, since they describe the initial states and therefore critically impact the precision of cross section predictions for observables. This talk will review recent precision analyses, where the PDFs play an important role and discuss the impact of several new ATLAS cross-section measurements on PDFs...
With their excellent energy resolution, efficiency, and intrinsic radio-purity, cryogenic calorimeters are primed for the search of neutrino-less double beta decay (0nDBD). The sensitivity of these devices could be further increased by discriminating the dominant alpha background from the expected beta like signal. The CUPID-0 collaboration aims at demonstrating that the measurement of the...
Transient gravitational wave emission can originate by phenomena associated with neutron stars (NSs) oscillations modes, such as hyperflares from galactic magnetars and binary coalescence. Potential signals related to these events are generally not well-modeled, requiring robust, morphology-independent analysis techniques. In particular, the coalescence of binary neutron stars (BNS) is a...
We present results on the measurement of very forward jets in p-Pb data with the CASTOR calorimeter in the CMS experiment at 5 TeV.
Several measurements of top quark properties are presented using data collected by the CMS experiment at different centre-of-mass-energies. The properties are mostly probed in the decay of the top quarks. The Wtb couplings are probed by measuring the helicity fractions in single top and ttbar topologies or by inspecting a V-A vertex structure of the coupling. Furthermore, searches for...
We present the current perspectives for SUSY at the LHC Run-II and at future colliders in the SU5, mAMSB and in a phenomenological Minimal Supersymmetric Standard Model scenarios with eleven parameters (pMSSM11). Our study includes the most important limits on SUSY coming from searches at runs 1 and 2 of the LHC, as well as the compatibility with the observed Higgs signal and the constraints...
The Institute of Physics (IOP) has a longstanding interest in diversity issues, particularly around the participation of girls and women in physics, who are under-represented in physics education and employment. In 2003, the Institute introduced a Site Visit scheme, in which selected panels visited physics departments and produced a dedicated report on their “gender inclusiveness”. After two...
MoEDAL is a pioneering experiment designed to search for highly ionising messengers of new physics such as magnetic monopoles or massive (pseudo-)stable charged particles, that are predicted to existing a plethora of models beyond the Standard Model. It started data taking at the LHC at a centre-of-mass energy of 13 TeV, in 2015. Its ground breaking physics program defines a number of...
The sensitivity of CMS measurements to Parton Distribution Functions, strong coupling constant and treatment of heavy flavours in QCD analyses is presented. CMS data collected at various center-of-mass energies and their impact on the PDFs are presented. Measurements of cross sections of jet and top-quark pair production are in particular sensitive to the gluon distribution in the proton and...
The gravitational wave era has started with the detections of gravitational waves originated from the coalescences of black holes. This gives new challenges and interests to the multi-messenger approach, which aims to reach the extraordinary result of identifying the counterparts. In this talk, we review the gravitational wave low-latency algorithms used by the LIGO-Virgo collaboration. Those...
Several measurements of top quark properties are presented using data collected by the CMS experiment at different centre-of-mass-energies. The properties are mostly probed in production of the top quarks. The charge asymmetry is measured inclusively and differentially probing anomalous couplings to the gluons at production mode. These measurements are extended searching for asymmetries in...
Radiatively-driven natural Supersymmetry, a theoretically and experimentally well-motivated framework, centers around the predicted existence of four light, nearly mass-degenerate Higgsinos with mass $\sim 100-200$ GeV (not too far above $m_Z$). Their small mass splittings of at most 20 GeV implies very little visible energy of accompanying Standard Model particles decayed from heavier...
The study of the azimuthal correlation with $\pi^0$ offers a powerful way to investigate the properties of strongly-interacting matter created in ultra-relativistic heavy-ion collisions.
In this talk, we present the measurement of two-particle correlations of $\pi^0$ trigger particles with associated charged particles versus azimuthal angle difference ($\Delta\varphi$) in pp and central Pb–Pb...
A flexible trigger system, excellent vertex locator, particle identification detectors, and forward acceptance allow unique exotica measurements to be performed at LHC energies using data collected with the LHCb detector. A summary of results will be presented, including searches for long-lived particles decaying into jet pairs or semi-leptonically.
Neutrinoless double-beta decay can provide evidence of lepton number violating processes and its observation can give information on the nature and the absolute mass scale of neutrinos. The SuperNEMO demonstrator searches for such decay through a tracking calorimeter technique which allows to disentangle different mechanisms for neutrinoless double beta decay with powerful background rejection...
Following the hints for deviations from the Standard Model in rare B meson
decays, searches for rare and forbidden decays of charmed hadrons become a hot
topic again. We present recent results on rare D0 and Lc decays.
The WiSE program at Syracuse University encompasses a broad spectrum of activities designed to develop the unique strengths and overcome the challenges that women in science, technology, engineering, and mathematics (STEM) face at every stage of their education and career, from the beginning of their undergraduate studies to accomplished professional roles.
Key goals of Wise are an...
This presentation will review the projected accelerator performance and the physics opportunities for a heavy-ion programme at FCC-hh [1]. In addition, the status of the FCC-hh detector design studies will be discussed.
The FCC-hh Design Study will assess the feasibility and potential of a hadron collider with a centre-of-mass of 100 TeV for pp collisions.
Operating FCC-hh with heavy-ion...
The MiniBooNE experiment reported results from the analysis of $\nu_e$ and $\overline{\nu}_e$ appearance searches, which showed an excess of signal-like events at low reconstructed neutrino energies with respect to the expected background. A proposed explanation for this anomaly is based on the existence of a heavy ($\sim 50$ MeV) sterile neutrino. These $\nu_h$ would be produced by $\nu_\mu$...
Many extensions of the standard model including SUSY predict new particles with long lifetimes, such that the position of their decay is measurably displaced from their production vertex, and particles giving rise to other non-conventional signatures. We present recent results of searches for long-lived particles and other non-conventional signatures obtained using data recorded by the CMS...
A stochastic background of gravitational waves can be described as a superposition of several uncorrelated contributions. It can be of both cosmological and astrophysical origin. In the first case, it can constitute potentially a unique probe of the primordial universe. In the second, it can give precious information on stellar populations. After discussing how this kind of signal can be...
A phenomenological study of the final combined HERA data on inclusive deep inelastic scattering (DIS) has been performed. The data are presented and investigated for a kinematic range extending from values of the four-momentum transfer, $Q^2$, above 10$^4$ GeV$^2$ down to the lowest values observable at HERA of $Q^2$ = 0.045 GeV$^2$ and Bjorken x, $x_{Bj}$ = 6 x 10−7. The data are well...
The question of the validity of analyzing charmed meson decays to pairs of mesons within the $SU(3)_F$ framework has been long and often debated. There are convincing arguments that small breaking of this symmetry can accommodate for the current experimental data on branching fractions of $D\to P P$ ($P=\pi,K,\eta$). However, the uncertainty in the evaluation of the amplitudes in these modes...
We evaluate the fine-tuning of the phenomenological minimal supersymmetric standard model (pMSSM). We show that the fine-tuning of the pMSSM is not large yet, nor under pressure by LHC searches. We also determine GUT scale models with the same low fine-tuning.
Low sbottom, stop and gluino masses turn out to be less relevant for low fine-tuning than commonly assumed. Fine-tuning arguments point...
Precise measurements of the properties of the top quark test the Standard Model (SM) and can be used to constrain new physics models. As it may be significantly enhanced by the presence of new physics, the ttbar production charge asymmetry is measured inclusively and differentially using the 8 TeV ATLAS dataset using both the lepton+jets and dilepton channels, including a dedicated measurement...
The XMaS Scientist Experience was conceived as an impact project aimed at promoting career aspirations for 17-18 year old female school students. It was centred around the XMaS Beamline which is located at the European Synchrotron Radiation facility in Grenoble, France. The competition asks entrants to research a famous female role model and describe her impact to science and 14 successful...
The measurement of the time-dependent CP violation parameters for B-meson decays is crucial for tightening the constraints on the unitarity triangle and for the search of new physics beyond the Standard Model.
A clean environment for the study of B decay channels is provided by B-factories. With a design luminosity of 8 · 10^35 cm^−2s^−1, leading ultimately to an integrated luminosity beyond...
We discuss the complete overview of the forward-backward asymmetry measurements in the angular distributions of $p\bar p \to t\bar t$ events at the Tevatron collider. These measurements use the full Run II data set in lepton plus jets and dilepton channels, recorded in the D0 and CDF detectors, corresponding to an integrated luminosity of $\approx 2\times10\ $fb$^{-1}$ . The combinations of...
The Large Hadron-electron Collider LHeC and the Future Circular Collider in electron-hadron mode FCC-eh will provide unique electron-lead collisions with center-of-mass energies in the range 0.8-2.2 TeV, and instantaneous luminosities around $10^{33}$ cm$^{-2}$s$^{-1}$ per nucleon that will result in luminous data samples of typically 10 fb$^{-1}$ per nucleon. In this talk, we illustrate the...
Many theories of beyond the Standard Model (BSM) physics predict unique signatures which are difficult to reconstruct and the background rates are also a challenge. Signatures from displaced vertices anywhere from the inner detector to the muon spectrometer as well as those of new particles with fractional or multiple value of the charge of the electron or high mass stable charged particles...
We study the muon g-2 and neutralino dark matter as explained by the MSSM where the squarks and 3rd generation sleptons are decoupled. Particularly, we focus on constraints from current and future dark matter experiments such as PandaX-II and LUX-2016 as well as current bounds from collider searches. Using the constraints on the MSSM from the muon g-2 and DM searches, we study constraints from...
Continuous gravitational waves emitted by spinning neutron stars, isolated or in binary systems, are among the main targets of LIGO and Virgo interferometric detectors. No continuous wave has been detected so far, but significant upper limits, providing interesting constraints on the characteristics and demography of the potential sources, have been obtained. In this talk I will review the...
We present the updates of CTEQ-TEA parton distribution functions (CT17 PDFs). Previous LHC 7 TeV and HERA 1 data, included in the CT14 PDF analysis, are superseded by HERA 1+2 and new LHC data, especially on W boson, Z boson, inclusive jet, and top quark differential distributions. We also discuss the possibility of a (sizable) non-perturbative contribution to charm parton distribution...
Given the quite limited number of permanent positions in HEP, is it really possible to be gender/diversity-inclusive? And what about people with a disability?
Detections of stellar mass binary black holes (BBHs) system in the first observing run of LIGO interferometers has started an exciting new era of black hole astrophysics.
Understanding the possible formation channels of the population of BBH will be important to understand the environment in which such systems are formed. Hence, the recent detections prove that BBHs exists in nature and merge...
We analyze the phenomenological status of several models of BSM physics explaining the muon g-2 anomaly and the relic density of dark matter. We consider scenarios requiring extra vector-like matter, some of which are based on supersymmetry. We confront the models with the latest bounds from the LHC 14 TeV run, direct and indirect searches for dark matter, and precision tests of the...
SHIP is a new general purpose fixed target facility, whose Technical Proposal has been recently reviewed by the CERN SPS Committee and by the CERN Research Board. The two boards recommended that the experiment proceeds further to a Comprehensive Design phase in the context of the new CERN Working group "Physics Beyond Colliders", aiming at presenting a CERN strategy for the European Strategy...
Fixed target experiments are a particularly useful tool in the search of very weakly coupled particles in the MeV-GeV range, which are of interest, e.g. as potential Dark Matter mediators. The NA62 experiment at the CERN SPS is currently taking data to measure the rare decay $K \to \pi \nu \bar{\nu}$. Owing to the high beam-energy and a hermetic detector coverage, NA62 also has the...
We present the current status of the Unitarity Triangle Analysis in the Standard Model and in the presence of New Physics, as well as a global analysis of D meson mixing data. Based on these results, we obtain constraints on New Physics in Delta F = 2 processes and present bounds on the scale of New Physics.
Recently released ATLAS and CMS measurements of the Z transverse momentum distribution in vector boson hadroproduction have the potential to significantly constrain the gluon and light quark PDFs in a range of Bjorken-x that is relevant for Higgs production.
In this talk I will review the most recent data and discuss their inclusion in a PDF determination based on the NNPDF methodology. In...
The top quark is the heaviest known fundamental particle and probing its couplings with the other fundamental particle may open a window to physics beyond the Standard Model. Single top-quark production provides a unique window to study the coupling between the top quark, the W boson and the b quark, since it involves the Wtb vertex in both production and decay. Measurements of angular...
The main scientific goal of the NICA heavy-ion physics program
at JINR will be an experimental investigation of the properties of
nuclear matter under extreme conditions. A comprehensive scan
of the QCD phase diagram in the region of maximum baryon density
will be performed at NICA with ion beam species ranging from protons
to gold nuclei. Systematic measurements of the production of...
Hadronic $B$ decays without a charm quark constitute a powerful probe to search for
physics beyond the standard model as well as provide constraints of $CP$-violation
parameters. We report the final measurements from Belle of the branching fraction
and $CP$ asymmetry for the decays $B^{0}\to \pi^{0}\pi^{0}$, $B^{\pm}\to
K^{+}K^{-}\pi^{\pm}$ and preliminary results for $B^\pm\to...
SHiP is a new general purpose fixed target facility, whose Technical Proposal has been recently reviewed by the CERN SPS Committee and by the CERN Research Board. The two boards recommended that the experiment proceeds further to a Comprehensive Design phase in the context of the new CERN Working group "Physics Beyond Colliders", aiming at presenting a CERN strategy for the European Strategy...
Sterile neutrinos are among the most attractive extensions of the SM to generate the light neutrino masses observed in neutrino oscillation experiments.
When the sterile neutrinos are subject to a "lepton number"-like symmetry they can have masses around the electroweak scale and potentially large Yukawa couplings, which makes them testable at the planned Future Circular Colliders (FCC).
In...
Recent results on the double parton scattering studies and
measurement of the underlying event activity, performed using
proton-proton collisions data collected using the CMS detector
are presented. Comparisons to previous results at different
center of mass energies are also reported. Latest tests of
double parton scattering, underlying event tunes, minimum bias,
and diffraction are made by...
Using more than $920 {\rm fb}^{-1}$ data collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider, we report the first measurement of the T-odd moments in the decay $D^0 \to K_S^0 \pi^0 \pi^+ \pi^-$ and the first observation of the radiative charm decay $D^0 \to \rho^0 \gamma$. We search for CP-violation in decays $D^0 \to K_S^0 K_S^0$, $D^+ \to \pi^+ \pi^0$, $D^0 \to...
An Electron Ion-Collider (EIC) has been highlighted as the highest priority for new construction in the DoE Office of Nuclear Physics. This is a very challenging accelerator that aims at achieving high luminosity and polarization collisions of electrons with multiple ions species and variable center of mass.
Alternative designs are pursued at Jefferson Laboratory (JLEIC) and Brookhaven...
Being able to predict a small set of hadronic observables precisely and more importantly reliably
in lattice QCD has been a big achievement (see Flavour Lattice Averaging Group review). Decreasing the precision
below the %-level and increasing the set of numbers for which predictions can be made is challenging
but exciting. This talk will highlight recent conceptual progress on hadronic...
The large centre-of-mass energy available at the proton-proton collider LHC allows for the copious production of top quark pairs in association with other final state particles at high transverse momenta. The ATLAS experiment has measured several final state observables that are sensitive to additional radiation in top anti-top quark final states. Results on the top production in association...
The High Energy physics community in Colombia and in Latin America in general is steadily growing with stronger Physics programs and a larger participation in worldwide international collaborations and experiments. Along with these developments, great effort is being put into education and outreach activities that inspire the public and motivate the next generation of students to pursue a...
Measurements of the individual electron and positron fluxes and of the positron fraction have different systematic errors. The flux measurements depend on the acceptance while the fraction measurement depends more on statistics. The latest AMS results on the precision measurement of the positron fraction in primary cosmic rays in the energy range from 0.5 to 700 GeV based on ~20 million...
Recent results on study of exclusive processes of $e^+e^-$ annihilation into hadrons below 2 GeV obtained at the SND detector are presented. The analyses are based on data collected at the VEPP-2M and VEPP-2000 colliders. In particular, we present the precise measurements of the $e^+e^-\to \pi^0\gamma$ and $e^+e^-\to K^+K^-$ cross sections, and the first measurments of the $e^+e^-\to...
I will review the current status of the Composite Higgs scenarios. Discussing the advances on both theoretical and experimental sides.
We present a systematic approach to the classification of the UV properties of higher dimensional operators spanned by $\Phi^\dagger \Phi$ and ordinary derivatives thereof (e.g. $\partial_\mu (\Phi^\dagger \Phi)\partial^\mu (\Phi^\dagger \Phi) , (\Phi^\dagger \Phi)^3, (\Phi^\dagger \Phi)^4, \dots$) in Higgs Effective Field Theories. The procedure is purely algebraic and thus...
Among the scientific divulgation activities of National Institute of Nuclear Physics of Naples (INFN-NA), the installation of the underground cosmic radiation telescope at the Toledo Metro Station in Naples in 2014 had a major impact on territory. The detector,consisting of 10 xy scintillator planes, read by SiPM, was developed by the National Laboratory of the Gran Sasso (LNGS), and installed...
A comprehensive set of measurements of top quark pair production in association with EWK bosons (W, Z or ɣ) is presented at different centre-of-mass energies. The results are compared to the theory predictions and re-interpreted as searches for new physics inducing deviations from the standard model predictions using an effective field theory approach. The status of the search for double-ttbar...
The CMD-3 detector is taking data at the VEPP-2000 e+e
collider (BINP, Novosibirsk, Russia). The CMD-3
is the general purpose particle magnetic (1.3 T) detector, equipped with
the tracking system, two crystal (CSI and BGO) calorimeters, liquid Xe
calorimeter, TOF and muon systems. The main goal of experiments with CMD-3
is the measurement of the cross-sections and dynamics of the...
The LHC machine is planning an upgrade program which will smoothly bring the luminosity at about 5*10^34cm-2s-1 in 2028, to possibly reach an integrated luminosity of 3000fb-1 by the end of 2037. This High Luminosity LHC scenario, HL-LHC, will require a preparation program of the LHC detectors known as Phase-2 upgrade. The current CMS Outer Tracker, already running beyond design...
We explore a possibility to UV-complete the Standard Model in an asymptotically safe manner. We assume the existence of $N_F$ new types of vector-like fermions which minimally couple to $SU(3)_C$ and/or $SU(2)_L$ and modify the running of the corresponding gauge couplings in such a way that at least one of them is not asymptotically free anymore. If additionally the BSM fermions carry a...
A review of the state of the art of presently working e+e- colliders, from low to high energy, will be presented, with a brief summary of performances. A review of proposed e+e- colliders will also be presented with highlights on the technical challenges.
The discovery of a Higgs boson at the Large Hadron Collider (LHC) motivates searches for physics beyond the Standard Model (SM) in channels involving coupling to the Higgs boson. A search for a massive resonance decaying into a standard model Higgs boson (h) and a W or Z boson or two a standard model Higgs bosons is performed. Final states with different number of leptons and where the Higgs...
The unambiguous identification and systematic study of bound states beyond the constituent quark degrees of freedom, e.g., multiquark states or states with gluonic degrees of freedom (hybrids, glueballs) would provide validation of and valuable input to the quantitative understanding of QCD. Hadron spectroscopy is one of the most important physics goals of BESIII. Since 2009, BESIII has...
In the high luminosity era of the Large Hadron Collider (HL-LHC), the instantaneous luminosity is expected to reach unprecedented values, resulting in about 200 proton-proton interactions in a typical bunch crossing. To cope with the resultant increase in occupancy, bandwidth and radiation damage, the ATLAS Inner Detector will be replaced by an all-silicon system, the Inner Tracker (ITk),...
K->pinunu is one of the theoretically cleanest meson decay where to look for indirect effects of new physics complementary to LHC searches. The NA62 experiment at CERN SPS is designed to measure the branching ratio of the K+->pi+nunu decay with 10% precision. NA62 took data in 2015 and 2016 reaching the Standard Model sensitivity. The KOTO experiment in Japan is investigating the decay K0->pi0...
The measurements of associated production of a massive gauge boson with
a top-antitop quark pair at the LHC provide an important test of the
Standard Model, in particular of the top quark couplings.
To increase the precision of the theoretical predictions beyond NLO, a class of
logarithmic corrections can be taken into account with the help of
resummation methods.
In this talk results for soft...
As particle physicists are, even those who work on the communication on particle physics are always involved with the traces of something. Images have an increasingly important function in communication through both traditional and new media, and play an even more relevant role in building a good storytelling. Unfortunately - that’s a well-known evidence - particles and forces of nature are...
We have recently proposed a new regularization framework based on the loop-tree duality theorem. This theorem allows to rewrite loop level amplitudes in terms of tree-level like structures and phase-space integrations. In consequence, it is possible to combine naturally real and virtual contributions at integrand level. Moreover, by introducing a proper momentum mapping, a complete local...
We report some of the most recent results in studying different aspects of QCD with about 500 fb$^-1$ of data collected by the BaBar experiment at the e+e- $B$-factory PEP-II.
In particular, we present Dalitz plot analyses of the hadronic three-body $J/\psi$ decays to $\pi^+\pi^-\pi^0$, $K^+K^-\pi^0$, and $K_S K^{\pm}\pi^{\mp}$ using an isobar model and a Veneziano model. We then show the...
The ALICE experiment at CERN is built to study the properties of the strongly interacting matter created in heavy-ion collisions at the LHC. A major upgrade of its Inner Tracking System (ITS) is currently undergoing, which will increase the data taking capability by more than two orders of magnitude. At the same time, the secondary vertexes reconstruction precision will improve by at least a...
An array of about 70 small-sized telescope will cover the high-end of the gamma ray energy spectrum at the southern site
of the Cherenkov telescope array (CTA). They will offer an unprecedented insight on the energetic processes in the range
1-300TeV originated in galactic and extragalactic sources.
The SST-1M is one of the three implementations of those small-sized telescopes and consists of...
State-of-the-art theoretical predictions accurate to next-to-leading order QCD interfaced with Pythia8 and Herwig++ event generators are tested by comparing the unfolded ttbar differential data collected with the CMS detector at 8 and 13 TeV. These predictions are also compared with the underlying event activity distributions in ttbar events using CMS proton-proton data collected at a center...
On Monday March 20th 2017, an outreach event dedicated to the gravitational waves and their recent discovery by the LIGO-Virgo collaboration took place. Jointly organized by the “Centre National de la Recherche Scientifique” (CNRS) and the “Société Française de Physique » (SFP), it was targeting the general audience with an emphasis on high-school students and teachers. The key feature of this...
The design of the interaction region (IR) of the positron-electron future circular collider must comply with various important constraints, imposed by high beam currents, short bunches, high beam energy, high luminosity need for polarization, and crossing scheme. The innovative IR layout of the FCC-ee is based on the crab-waist collision scheme and it will be compatible for all beam energies...
The largest gaseous Time Projection Chamber (TPC) in the world, the ALICE TPC, will be upgraded based on Micro Pattern Gas Detector technology during the second long shutdown of the CERN Large Hadron Collider in 2019/20. The upgraded detector will operate continuously without the use of a triggered gating grid. It will thus be able to record all minimum bias Pb-Pb collisions that the LHC will...
New gauge bosons with renormalizable couplings to quarks but not to leptons must interact with additional fermions ("anomalons") required to cancel the gauge anomalies. Analyzing the decays of such leptophobic bosons into anomalons, I show that they produce final states involving leptons at the LHC. Resonant production of a flavor-universal leptophobic Z′ boson leads to cascade decays via...
We present the most recent data from the engineering run at FNAL of the new g-2 experiment. The method of extracting the anomalous magnetic moment is summarized and the improvements implemented in the new experimental beam delivery, storage ring, detectors and analysis techniques are discussed. The current understanding of the systematics from the experiment and theory are presented together...
In order to fully exploit the abundance of hadronically decaying high momentum top quarks, and W, Z or Higgs bosons produced at LHC, jet substucture has become crucial to a wide array of searches and measurements. The latest ATLAS results in terms of optimisation and performance of large radius jets taggers are presented. The calibration of large radius jets energy and mass and their...
The thermalization process of an out-of-equilibrium boost-invariant strongly interacting non-Abelian
plasma is investigated using a holographic method. Boundary sourcing, a distortion of the boundary metric,
is employed to drive the system far from equilibrium. Thermalization is analyzed in the fully dynamical
system through nonlocal probes: the equal-time two-point correlation function of...
Many extensions to the Standard Model predicts new particles decaying into two bosons (WW, WZ, ZZ, Zgamma) making these important signatures in the search for new physics. Searches for such diboson resonances have been performed in final states with different numbers of leptons, photons and jets where new jet substructure techniques to disentangle the hadronic decay products in highly boosted...
The CLIC Test Facility (CTF3) was built to demonstrate the feasibility of the CLIC two beam acceleration scheme. The main issues to be verified were the high current drive beam generation using a fully loaded highly efficient linac and a beam combination scheme, based on transverse RF deflectors, to increase beam current and bunch repetition frequency.
The drive beam has been used for GW...
In this talk we present results of our study of the next-to-leading order corrections to deeply virtual pion and kaon production in neutrino experiments. We estimate these corrections in the kinematics of the Minerva experiment at FERMILAB, and find that they are sizable and increase the leading order cross-section by up to a factor of two. Also, we estimate the cross-sections of the...
Solving by a string theory the 't Hooft large-$N$ expansion of QCD is a long-standing problem that resisted all the attempts despite the advent of the celebrated gauge/gravity duality in the framework of string theory. We demonstrate that in the canonical string framework such a solution does not actually exist because an inconsistency arises between the renormalization properties of the...
The Higgs mechanism is introduced in a completely classical framework in which the concept of energy is reviewed. After a brief review of the classical energy of a particle in a gravitational or electromagnetic fields, we show that postulating the existence of a new field (the Higgs field) one can easily introduce a new term in the energy that is consistent with the relativistic energy at rest...
The BABAR Collaboration has an intensive program studying hadronic cross sections in low-energy $e^+e^-$ annihilations, which are accessible with data taken near the $\Upsilon$(4S) via initial-state radiation.
Our measurements allow significant improvements in the precision of the
predicted value of the muon anomalous magnetic moment. These improvements are necessary for shedding light on...
The presentation will be based on our paper in preparation [1].
We discuss production of pairs of $J/\psi$ in pp collisions in the context
of recent results obatained at the LHC at large transverse momenta.
The leading-order $O(\alpha_s^4)$ contribution
is calculated in both collinear and the $k_t$-factorization approach
with the KMR UGDF.
We include also two-gluon exchange contribution ...
The LHCb detector at the LHC is a general purpose detector in the forward region with a focus on reconstructing decays of c- and b-hadrons. For Run III (2021 onwards) of the LHC, LHCb will take data at an instantaneous luminosity of 2 × 10^{33} cm−2 s−1, five times higher than in Run II (2015-2018). To cope with the harsher data taking conditions, the LHCb collaboration will upgrade the DAQ...
The sharp change in slope of the ultrahigh-energy cosmic ray (UHECR) spectrum around 10^9.6 GeV (the ankle), combined with evidence of a light but extragalactic component near and below the ankle which evolves to intermediate composition above, has proved exceedingly challenging to understand theoretically. Recently, we introduced a very general model, in which for a range of source...
Using new hadronic cross section data for more than 10 exclusive channels mainly from Babar in the energy range up to 2 GeV and also from VEPP-2000, the hadronic contributions to the muon magnetic anomaly and to the running of the electromagnetic coupling constant at the Z-boson mass are updated. The new data complement the previously available information on exclusive channels allowing to...
The top-down holographic Witten-Sakai-Sugimoto model for low-energy QCD, augmented by finite quark masses, has recently been found to be able to reproduce the decay pattern of the scalar glueball candidate f0(1710) on a quantitative level. We show that this model predicts a narrow pseudoscalar glueball heavier than the scalar glueball and with a very restricted decay pattern involving eta or...
The Hyper-Kamiokande (Hyper-K) experiment centres around two proposed next-generation underground water Cherenkov detectors that will be nearly 20 times larger than the highly successful Super-Kamiokande and use significantly improved photodetectors with the same 40 % photocoverage. The resulting sensitivity improvements will particularly benefit astroparticle physics at low energies.
This...
The search for the Lepton Flavor Violating decays $\mu^+ \to e^+ \gamma$ and $\mu^+ \to e^+ e^+ e^-$ will reach an unprecedented level of sensitivity within the next five years thanks to the MEG-II and Mu3e experiments. These experiments will take data at the Paul Scherrer Institut where continuous muon beams are delivered at a rate of about $10^8$ muons per seconds. On the same time...
Many theories describing physics beyond the Standard Model rely on a large separation of scales. Large scale separation arises in models with mass-split flavors if the system is conformal in the ultraviolet but chirally broken in the infrared. Because of the conformal fixed point, these systems exhibit hyperscaling and a highly constrained resonance spectrum. We derive hyperscaling relations...
The proposed upgrade of the LHC, the High-Luminosity LHC (HL-LHC) is expected to deliver data corresponding to a luminosity of up to 3 ab-1 under severe pileup conditions with up to 200 additional interactions per bunch crossing. The pileup effects are expected to be mitigated by upgraded detectors, which allow to study rare physics processes up to large rapidities, as well as precision...
I will discuss spectroscopic properties of heavy quarkonium hybrids
derived in the last year in the systematic framework of nonrelativistic effective field theories. Results will be compared with data and lattice determinations.
With the advent of higher energies and higher collision rates the LHC continues the exciting voyage towards new physics, allowing physicists all over the world to explore a previously unknown territory full of promise.
So far the IPPOG international masterclass developers, with the help of physicists and in close contact with teachers, have been successful in designing educational material...
The CSES (China Seismo-Electromagnetic Satellite) mission will investigate the structure and the dynamic of the topside ionosphere, will monitor electric and magnetic field and high energy particle fluctuations, searching for their correlations with the geophysical activity, in order to contribute to the monitoring of earthquakes from space.
The High-Energy Particle Detector (HEPD) is one of...
The KLOE-2 experiment at the INFN Laboratori Nazionali di Frascati
(LNF) is currently taking data at the e+e- DAFNE collider which is implementing an innovative collision scheme based on a crab-waist configuration.
An integrated luminosity of 3.5 fb-1 has been already collected by KLOE-2, and at least 5 fb−1 are expected by Spring 2018.
KLOE-2 represents the continuation of KLOE with an...
Measurements of open charm production are presented in diffractive deep inelastic scattering (5<Q2<100 GeV2), based on 287 pb−1 of H1 HERA-II data recorded at the center of mass energy sqrt(s)=319 GeV. The event topology is given by ep→eXY , where the system X, containing at least one D⋆(2010) meson, is separated from a leading low-mass proton dissociative system Y by a large rapidity gap. The...
We present a new computation of the Higgs effective vertex $H\ell_i\ell_j$ generated from heavy right handed neutrinos, within the Mass Insertion Approximation and to one-loop level. The simple analytical results found have interesting applications to phenomenology of Lepton Flavour Violation. In particular, we discuss some of these implications for Higgs mediated LFV processes.
Particle physics outreach can play a key role in promoting scientific culture and in the modernisation of university education in Latin America. In this context, the CEVALE2VE virtual community (Centro de Altos Estudios de Altas Energías in Spanish) builds collaborative networks with and between Latin American institutions and motivates physics undergraduate and master students to consider a...
In the next decades the Large Hadron Collider and its luminosity upgrade
are expected to yield a wealth of increasingly sensitive searches and
measurements in hadro-production of top quarks and electro-weak gauge
bosons. Several projects are being prepared for energy-frontier lepton
(ILC, CLIC, FCCee, CEPC, mC), electron-proton (LHeC), hadron colliders
(FCChh, SPPC) that are to continue this...
Vector like quarks appear in many theories beyond the Standard Model as a way to cancel the mass divergence for the Higgs boson. The current status of the ATLAS searches for the production of vector like quarks will be reviewed for proton-proton collisions at 13 TeV. This presentation will address the analysis techniques, in particular the selection criteria, the background modeling and the...
The SiD Detector is one of two validated detector designs for the future International Linear Collider. SiD features a compact, cost-constrained design for precision Higgs and other measurements, and sensitivity to a wide range of possible new phenomena. A robust silicon vertex and tracking system, combined with a 5 Tesla central solenoidal field, provides excellent momentum resolution. The...
AWAKE is a plasma wakefield acceleration experiment using the 12cm-long, 400GeV proton bunch of the CERN SPS. In order to reach an acceleration gradient in the GeV/m range, the plasma electron density is $7\times10^{14}cm^{-3}$. The transverse self-modulation instability (SMI), strongly seeded by an laser ionization front, turns the long bunch into a train of micro-bunches at the plasma...
The discovery of neutrino oscillations calls for an extension of the Standard Model that would generate neutrino masses and mixing. One of the simplest possibilities is the addition of fermionic gauge singlets or sterile neutrinos. TeV-scale realisations of this idea lead to a very rich phenomenology due to the mixing of the new fermions with the left-handed neutrinos of the SM and the large...
A search for a narrow baryonic state in the $pK_S^0$ and $\bar{p}K_S^0$ system has been performed in $ep$ collisions at HERA with the ZEUS detector using an integrated luminosity of 358 pb$^{−1}$ taken in 2003-2007. The search was performed with deep inelastic scattering (DIS) events at an $ep$ centre-of-mass energy of 318 GeV for exchanged photon virtuality, $Q^2$, between 20 and 100 GeV$^2$....
Combining Pati-Salam (PS) and flavour symmetries in a renormalisable setup,
we devise a scenario which produces realistic masses for the charged
leptons. Flavour-symmetry breaking scalar fields in the adjoint
representations of the PS gauge group are responsible for generating different
flavour structures for up- and down-type quarks as well as for leptons.
The model is characterised by new...
In recent times the realisation that children make decisions and choices about subjects they like during their primary school years became widely understood. For this reason academic establishments focus many of their outreach activities towards the younger ages. During the last academic year we designed and trialled a particle physics workshop for primary schools. The workshop allows young...
We present results of searches for massive top and bottom quark partners using proton-proton collision data collected with the CMS detector at the CERN LHC at a center-of-mass energy of 8 and 13 TeV. These fourth-generation vector-like quarks are postulated to solve the Hierarchy problem and stabilize the Higgs mass, while escaping constraints on the Higgs cross section measurement. The...
The proposed Compact Linear Collider (CLIC) will provide
electron-positron collisions with centre-of-mass energy operation in
three stages from a few hundred GeV up to 3 TeV. This offers a rich
precision physics program combined with high sensitivity to a wide range
of possible new phenomena. The precision required for such measurements
and the specific conditions imposed by the beam bunch...
We present a D-brane realisation of the (non-)Abelian $\mathscr{N}=2^*$ theory. For $\Omega$ deformation we compute suitable topological amplitudes in this setup. These amplitudes are expressed as a double series expansion. The coefficients determine couplings of higher-dimensional operators in the effective supergravity action that involve powers of the anti-self-dual $\mathscr{N}=2$ chiral...
We use the full Run II dataset consisting of $10.4\ \rm fb^{−1}$ of $p\bar p$ collisions recorded by the D0 detector at the Fermilab Tevatron collider at $\sqrt s=1.96\ $TeV to search for new exotic multiquark states. We report the evidence of a new state X(5568) decaying to $B^0_s\pi$ seen in the $B^0_s \to J/\psi\phi$ decay channel and its independent confirmation in the semi-leptonic...
We discuss the matching of the minimal seesaw scenario up to dimension
seven onto the SMEFT at tree level, and at one loop to dimension four following the papers arXiv:1703.10924 and arXiv:1703.04415. The dramatic possibility that the minimal seesaw scenario can form a UV boundary condition that give the Higgs potential and electroweak scale at lower energies with PeV Majorana masses is discussed.
Rare decays are fundamental probes of physics beyond the Standard Model.
The expanding LHCb program of strange physics, in particular of their rare decays, provides a unique and complementary probe to test the SM with respect to the beauty and charm sector.
We present here the current status of rare decays studies at the LHCb experiment, including the new limit on the Ks -> mu mu branching...
Muon beams of low emittance provide the basis for the intense, well characterised neutrino beams of the Neutrino Factory and for leptonantilepton
collisions at energies of up to several TeV at a Muon Collider. The international Muon Ionization Cooling Experiment (MICE) will demonstrate ionization
cooling the technique by which it is proposed to reduce the phasespace
volume occupied by the muon...
Searches for new resonances that decay either to pairs of top quarks or a top and a b-quark will be presented. The searches are performed with the ATLAS experiment at the LHC using proton-proton collision data collected in 2015 and 2016 with a centre-of-mass energy of 13 TeV. The invariant mass spectrum of hypothetical resonances are examined for local excesses or deficits that are...
The ICARUS T600 detector is the largest LAr-TPC operated to date. It performed 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 in cosmic rays.
After an intense refurbishing operation, the entire apparatus will be transferred to FNAL (USA), were...
This talk presents a review of precision top quark measurements at
linear e+e- colliders, with results from the ILC detector concepts and
the CLIC detector and physics group. After a brief overview of
established elements of the top physics programme, the contribution
focuses on new developments in the full-simulation studies of key
measurements. These include improvements in the...
A novel non-linear symmetry of black hole entropy is presented : Freudenthal duality, defined as an anti-involutive, non-linear map acting on symplectic spaces.
After a general introduction on some aspects of extended (super)gravity theories in four dimensions and the structure of their e.m. duality orbits, I will consider the e.m. duality Lie groups "of type E7", and the corresponding notion...
Sterile neutrinos may be part of a quasi-hidden sector that interacts with Standard Model particles via a heavy mediator. In the case where two (or more) sterile neutrinos have a flavor-changing coupling to a new boson which also couples to nucleons, the heavier state $N_2$ may decay into the lighter state $N_1$ and a pair of Standard Model particles. If the mass difference between the sterile...
We present a search for new massive particles decaying to heavy-flavour quarks with the CMS detector at the LHC. The prominent signature is the resonant production of top quark pairs. Decay channels to vector-like top partner quarks, such as T', are also considered for the first time. We use proton-proton collision data recorded at a centre-of-mass energy of 13 TeV. The search is performed in...
Recently, the standard model prediction of $\epsilon'/\epsilon$ was
improved, and a discrepancy from the experimental results was reported
at the $2.9\sigma$ level. We study the charging contributions to $Z$
penguin especially with the vacuum stability constraint. The vacuum
decay rate is investigated, and it is shown that the discrepancy can be
explained if super particles are lighter...
The Baby MIND detector under construction at CERN will measure the momentum and charge of muons from neutrino interactions in the WAGASCI neutrino targets. The WAGASCI experiment, referred to as T59 at J-PARC, will measure the ratio of neutrino interaction cross-sections on water and plastic using a three-dimensional grid structure providing large angular acceptance. The Baby MIND consists of...
After the unambiguous confirmation of the resonant behaviour of the Zc(4430) charmonium-like state and the observation of two pentaquark states, it is a main goal for the heavy flavour experiments to complete the picture with searches for the many partners the quark model predicts. We report on several studies of b-hadron decay modes potentially involving exotic intermediate states, including...
Atomic physics, dismissed prematurely by many to the role of introductory chemistry, had a remarkable renaissance in recent decades thanks to the new ideas and progress in laser technologies. Could this path be followed in other research domains which address femtometer length scales? The key challenge is to create high intensity and brilliance photon beams in the gamma-ray, MeV region,...
Communicating HEP results to the general public often relies upon a simplification of the physics behind it. In the long term can be this an issue e.g. for resources given by the funding agencies.
In the context of non-supersymmetric SO(10) models, we analyze the renormalization group equations for the fermions observables (including neutrinos) from the GUT energy scale down to the electroweak energy scale, explicitly taking into account the effects of an intermediate energy scale induced by a Pati--Salam gauge group. We show that the evolved fermion masses and mixing present sizable...
Theoretical results on heavy meson exotic spectroscopy will be presented mainly concentrating on hybrid heavy charmonia and bottomonia states. Theoretical results
for heavy hybrids states, c-antic-gluons systems, will be compared with experimental data. Finally the emerging differences for exotic mesons when described as compact tetraquarks, hybrid mesons, molecules or core mesons plus higher...
Results of searches for new particles such as leptoquarks, heavy neutrinos, and W bosons with right-handed couplings in final states with leptons (charged or neutral) and jets are presented. The emphasis is given to the recent results obtained using data collected in the 2016 run of the LHC.
The Mu2e experiment aims to measure the charged-lepton flavour violating (CLFV) neutrino-less conversion of a negative muon into an electron in the field of a nucleus. The conversion process results in a monochromatic electron with an energy slightly below the muon rest mass (104.97 MeV). Goal of the experiment is to improve of four orders of magnitude the previous measurement and reach a...
The T2K neutrino oscillation experiment established the $\nu_\mu \rightarrow \nu_e$ appearance with only 10\% of the original beam request of $7.8\times10^{21}$ 30 GeV protons on target (p.o.t.). In view of the J-PARC program of upgrades of the beam intensity, the T2K-II proposal requires to run up to $20\times10^{21}$ p.o.t., i.e. an increase of the exposure by more than a factor 10 aimed at...
The Large Hadron-electron Collider LHeC and the Future Circular Collider in electron-hadron mode FCC-eh will provide electron-proton collisions with center-of-mass energies in the range 1.3-3.5 TeV and instantaneous luminosities larger than $10^{34}$ cm$^{-2}$s$^{-1}$. The talk presents an overview on novel and unique top physics through single and pair production in ep collisions, including...
We investigate light massive string states that appear at brane
intersections. They replicate the massless spectrum in a richer
fashion and may be parametrically lighter than standard Regge
excitations. We compute tri-linear Yukawa couplings of such
open-string states to massless ones and to one another. Due to
ambiguities in the normalisation of the vertex operators, that involve
twist...
The Future Circular Collider with electron-positron beams (FCC-ee) should provide improvements of the electroweak precision measurement concerning Z, W, H and their masses by a large factor over the present status.
The unparalleled experimental precision would open, via Electroweak loop corrections, a broad discovery potential for new, at least weakly interacting particles up to high energy...
I will talk about a totally new mechanism of leptogenesis. It requires only a time-varying Weinberg operator. The Weinberg operator is well-known for the motivation of generating light neutrino masses. It violates lepton number and can provide non-equilibrium dynamics in the early universe due to the suppression of tiny neutrino masses. A lot of underlying symmetries, e.g., B-L symmetry and...
The NA48/2 experiment presents a final result of the charged kaon semileptonic decays form
factors measurement based on 4.28 million $K^\pm_{e3}$ and 2.91 million $K^\pm_{\mu 3}$ selected
decays collected in 2004. The result is competetive with other measurements in $K^\pm_{\mu 3}$
mode and has a smallest uncertainty for $K^\pm_{e3}$, that leads to the most precise
combined $K^\pm_{l3}$...
Many theories beyond the standard model predict new phenomena which decay to leptons and jets. Searches for new physics models with these signatures are performed using the ATLAS experiment at the LHC. The results reported here use the pp collision data sample collected in 2015 and 2016 by the ATLAS detector at the LHC with a centre-of-mass energy of 13 TeV.
The present CMS muon system operates three different detector types: in the barrel drift tubes (DT) and resistive plate chambers (RPC), along with cathode strip chambers (CSC) and another set of RPCs in the forward regions. In order to cope with increasingly challenging conditions various upgrades are planned to the trigger and muon systems.
In view of the operating conditions at HL-LHC, it...
The confirmation of excess in $R_{D^*}$ at the LHCb is an indication of
lepton flavor non-universality. Various different new physics operators
and their coupling strengths, which provide a good fit to $R_D$, $R_{D^*}$
and $q^2$ spectra, were identfied previously. In this work, we try to find
angular observables in $\bar{B} \to D^* \tau \bar{\nu}$ which enable us to distinguish between...
The TCO-Asa is a 2015 established team of high-school students of the Liceo Scientifico T. Calzecchi Onesti, in Fermo (Italy), who built a detector instrumented by consumer components including a CMOS camera and a silicon photomultiplier readout by the open-source ArduSiPM kit, to study the Cherenkov effect in water.
The proposed poster presents the main activities of the students that...
Aging effects are studied for the CMS RPC system which can manifest during the HL-LHC running period. A dedicated consolidation program was set up using the CERN Gamma Irradiation Facility ++, where RPC detectors are exposed to a high gamma flux for a long term period equivalent to the HL-LHC operational time. Based on the past operational experience, the high background conditions are...
Lattice-QCD recent results and calculations of Daison-Schwinger equation by
C.Roberts et al. allowed to estimate the constituent quark mass
$M_q$ about 400~MeV. This is in agreement with the value 0f 441~MeV in the
modern constituent quark model (NRCQM, by L.Glozman et al.) where it is
determined as 1/3 of the mass of $\Xi$-octet hyperon.
Earlier the discreteness in mass values of...
Latest 13 TeV results of CMS searches for the Higgs boson produced in association with top quarks and decaying to b quarks will be presented. This poster will focus on the semi-leptonic and di-leptonic channels with the matrix element method, BDT and DNN discriminants.
Anisotropic flow in heavy ion collisions is sensitive to the properties of produced hot and dense nuclear matter. In the present work, we will use a multi-phase transport (AMPT) model, with the default version and the version with string melting, to study the (pseudo)rapidity and pT dependence of anisotropic flow coefficients of charged hadrons and identified particles produced in heavy-ion...
Precision measurements by AMS of the antiproton flux and the antiproton-to-proton flux ratio in primary cosmic rays in the absolute rigidity range from 1 to 450 GV are presented based on $3.49 \times 10^5$ antiproton events and $2.42 \times 10^9$ proton events. At ~20 GV the antiproton-to-proton flux ratio reaches a maximum. Unexpectedly, above 60 GV the antiproton spectral index is consistent...
A study of feasibility of replacing a conventional phototube with an array of SiPMs is presented. High gain, low voltage operation and insensitivity to the magnetic field make SiPMs practically useful for the light collection in a physics experiment. In addition, sensors can be assembled in a compact system which is easily scalable. In this study an array of large area SiPMs was coupled...
ARIADNE is an ERC funded novel and innovative 1-ton two-phase LAr TPC experiment investigating photographic imaging as an attractive alternative readout method to charge readout that is currently planned for future giant two phase LAr neutrino experiments. Advantages over current readout techniques include reduction or elimination of charge read-out channels as well as ease of scalability,...
art@CMS is an education and outreach program of the CMS experiment at the Large Hadron Collider (LHC) at CERN, the European Laboratory for Particle Physics. It is based on the collaboration between the CMS and HEP scientific community, artists, art communities,as well as art and science teachers. The art@CMS scheme enacts as a master example within the HORIZON2020 initiative CREATIONS.
Since...
Many Beyond Standard Model theories foresee the existence of heavy
resonances (>1 TeV) decaying in final states that include a high-energetic,
boosted jet and charged leptons or neutrinos. In these very peculiar
conditions, Monte Carlo predictions are not reliable enough to reproduce
accurately the expected Standard Model background. A data-Monte Carlo hybrid
approach (alpha method) has been...
Scientific developments have seen reality dissolved into smaller and smaller invisible particles that the physicist has to make visible. This process is mirrored by the artist attempting to express thoughts and emotions through the manipulation of materials in the case of fine arts, or the movements of the human body in the case of dance. Taking the same journey from something hidden to...
The calibration of the ATLAS b-tagging algorithm in environments characterised by large jet multiplicity is presented. The calibration uses reconstructed ttbar candidate events collected by the ATLAS detector in proton-proton collisions at 13 TeV, with a final state containing one charged lepton, missing transverse momentum and at least four jets. The b-tagging efficiencies are measured not...
A variety of algorithms have been developed to distinguish b-quark jets from jets containing only lighter quarks within the ATLAS experiment at the Large Hadron Collider (LHC). We describe the measurement of the false positive rate, i.e. the efficiency for the identification of jets arising from light quarks or gluons, for the algorithm most commonly used in ATLAS data analyses during the LHC...
There is no explanation in the Standard Model for the existence of families and for their mass hierarchy. It is possible to think to some horizontal symmetries between families and their spontaneous breakdown. Then new interactions will arise and compositeness limits must be respected. But the more stringent limits may arise from flavour changing neutral currents and CP-violation. However...
Belle II is a major upgrade of the Belle experiment, and will operate at the B-factory SuperKEKB, located at the KEK laboratory in Tsukuba, Japan. Belle II will be an ideal laboratory to study the properties of the charm quark, collecting more than 5x10^10 ccbar events with a total integrated luminosity of about 50 ab^-1 in the next decade.
We will discuss the expected sensitivity of Belle...
A study on the Gaseous Electron Multiplier (GEM) foil material is performed to determine the moisture diffusion rate & saturation level and the moisture effects on its mechanical properties. The study is focused on the foil contact with ambient air and moisture to determine the value of the diffusion coefficient of water in the detector polyimide. The presence of water inside the detector foil...
The lightest pentaquark state recently observed by the LHCb collaboration, P(4380), is described with a compact multiquark approach. By using very general arguments, dictated by symmetry considerations, it is shown that this state belongs to an SU(3) flavour octet. A complete classi?cation of all possible states and quantum numbers, which can be useful both to the experimentalists in their...
We discuss a low energy $е^+е^-$ collider for production of the not yet discovered $\mu^+mu^-$ bound state (dimuonium). In our design we follow the Brodsky-Lebed proposal of the large-crossing-angle $е^+е^-$ intersection, when the dimuonium carries non-zero momentum and decays to $е^+е^-$ pair far apart from the beam collision region. The latter provides effective suppression of the Bhabha...
Recent $^8Be^*$ decay anomaly suggests the existence of a light dark boson which has a suppressed coupling to proton compared to its coupling to neutron. The simple dark $U(1)$ model constructed by introducing a kinetic mixing between standard model $U(1)_Y$ gauge boson and the dark boson needs to be generalized to satisfy the above requirement. The couplings of dark boson to standard model...
One of the open questions in the Standard Model is what the origin for the mass hierarchy and mixing of fermions is. The question, the so called "flavor problem", arises because in the lagrangian of the Standard Model the masses and mixing angles are completely arbitrary, their values are explained by ad hoc Yukawa couplings to fit the experimental data without giving a theoretical motivation...
With ever increasing luminosity at the LHC, optimum online data selection is getting more and more important. While in the case of some experiments (LHCb and ALICE) this task is being completely transferred to computer farms, the others - ATLAS and CMS - will not be able to do this in the medium-term future for technological, detector-related reasons. Therefore, these experiments pursue the...
A novel higher-level flavour tagging algorithm called DL1 has been developed using a neural network at the ATLAS experiment at the CERN Large Hadron Collider. We have investigated the potential of Deep Learning in flavour tagging using higher-level inputs from lower-level physics-motivated taggers. A systematic grid search over architectures and the training hyperparameter space is presented....
The STEREO experiment was developed to confirm the hypothesis of a light sterile neutrino arising from the observed discrepancy between measured reactor antineutrino fluxes and revised flux predictions, known as the Reactor Antineutrino Anomaly. The detector is located at 10 m from the compact nuclear reactor core of the Institut Laue-Langevin, composed of >90% enriched 235U fuel. Antineutrino...
The Large Hadron-electron Collider LHeC and the Future Circular Collider in electron-hadron mode FCC-eh will provide electron-proton collisions with center-of-mass energies in the range 1.3-3.5 TeV and instantaneous luminosities larger than $10^{34}$ cm$^{-2}$s$^{-1}$. In this talk, we present new results on the precise determination of proton parton densities at both small and large x in...
The CT-PPS (CMS-TOTEM Precision Proton Spectrometer) project is a combined effort of the CMS and TOTEM collaborations to construct a detector with the purpose of studying central exclusive production (CEP) in proton-proton collisions. This poster describes the simulation and reconstruction code for the CT-PPS detectors implemented in CMS FastSim. The protons scattered from the collision at...
The J-PARC T59 experiment, named WAGASCI, is a neutrino detector with a water target, and it is planed to start taking the neutrino beam data from October 2017 at J-PARC neutrino beamline. Its goal is to measure the cross section ratio of charged current neutrino interaction on nucleus between water target and plastic target with the accuracy of a few percent. The detector adopts...
The COMET experiment searches for the muon-to-electron($\mu-e$) conversion with a sensitivity below $10^{-16}$ which is 10,000 times better than the present upper limit.
This process is strictly forbidden in the standard model because of the lepton flavor conservation law.
In contrast, its branching ratio can be sizable around $10^{-15}$ in many models of physics beyond the standard model...
We study the case of Dirac fermionic dark matter (DM). It is well known that the Dirac fermionic DM is seriously constrained from the experiment of spin-independ (SI) elastic cross sections with nuclei in the direct search. To evade the tree level interaction, the quantum numbers of the Dirac DM are taken to be $I_3=Y=0$. We find that there is a cancellation in one-loop diagrams, which reduces...
Project Extreme Energy Events (EEE) – “La scienza nelle scuole” is an experiment dedicated to the study of high energy cosmic radiation, using detectors distributed over an area of more than half a million km2, from Geneva to Lampedusa. Data are taken simultaneously from about 40 telescopes. More than 40 billion particles have been registered up to now.
Project was born in 2004 from an idea of...
In the standard model neutrinos are massless left-handed fermions which very weakly interact with matter via exchange of the $W^\pm$ and $Z_0$ bosons. The development of our knowledge about neutrino masses and mixing provides a basis for exploring neutrino properties and interactions beyond the standard model (BSM). In this respect, the study of electromagnetic characteristics of massive...
An accurate calibration of the energy measurement of electron and photon is needed for many ATLAS physics analysis.
The calibration of the energy measurement is performed in-situ using a large statistics of Z->ee events. A pre-requisite of this calibration is a good understanding of the material in front of the calorimeter and of the inter-calibration of the different calorimeter layers....
Electron identification is a crucial input to many ATLAS physics analysis. The electron identification used in ATLAS for run 2 is based on a likelihood discrimination to separate isolated electron candidates from candidates originating from photon conversions, hadron misidentification
and heavy flavor decays. In addition, isolation variables are used as further handles to separate
signal and...
Transverse momentum distributions of pions produced in relativistic nuclear collisions (p-p, Cu-Cu, Pb-Pb, Au-Au) at various energies including BES data are studied using Tsallis distribution as a parametrization. We will present the energy dependence and collision centrality of the Tsallis fit parameters, Tsallis temperature, volume and non-extensivity parameter, a parameter characterizing...
To extend the LHC physics program, it is foreseen to operate the LHC in the future with an unprecedented high luminosity. To maintain the experiment's physics potential in the harsh environment of this so-called phase-2, the detector will be upgraded. At the same time the detector acceptance will be extended and new features such as a L1 track trigger will be implemented. Simulation studies...
Analyses searching for diboson resonances are very powerful tools to
investigate many beyond the Standard Model (BSM) scenarios such as extension of
the Higgs sector, Heavy Vector triplets (W’ and Z’) or excited states of
Gravitons. These searches exploit the many decay channels of the two bosons
allowing to select topologies with varied signal to background ratios and
statistics. Among these...
Since their invention, scintillator materials found many applications in physics. Several e.m. calorimeters in HEP, e.g. in CMS, Fermi and Gamma-400, use crystal scintillators with high-Z elements as CsI and PWO.
The impact of crystal orientation of scintillators is usually poorly considered, whereas in fact the influence of the crystalline structure on radiation and pair production in more...
Motivated by an anomaly observed in the decay of an excited state of Beryllium by the Atomki collaboration, we study an extension of the Standard Model with a gauged U(1)′ symmetry in presence of a 2-Higgs Doublet Model structure of the Higgs sector. We show that this scenario complies with a variety of experimental results and is able to explain the potential presence of a resonant spin-1...
The Extreme Energy Events (E.E.E.) experiment is a strategic project of Centro Fermi dedicated to the study of extreme energy cosmic rays. In particular it exploits a network of muon tracking telescopes constituted by three large area (2x2 vm^2) Multigap Resistieve Plate Chambers (MRPC). These detectors are used in many experiments due to its excellent efficiency and time resolution.
The...
Starting during the upcoming major LHC shutdown from 2019-2021, the ATLAS experiment at CERN will move to the the Front-End Link eXchange (FELIX) system as the interface between the data acquisition system and the trigger
and detector front-end electronics. FELIX will function as a router between custom serial links and a commodity switch network, which will use industry standard technologies...
We, the Institute for Basic Science Center for Axion and Precision Physics Research report the first axion dark matter search with toroidal geometry.
A toroidal geometry can provide several advantages, which are a larger volume for a given space and greatly reduced fringe fields which interfere with quantum noise limited superconducting amplifiers.
In this pioneering search, we exclude the...
The dynamics of isolated-photon plus jet production in pp collisions at sqrt(s) = 13 TeV were studied with the ATLAS detector at the LHC using a dataset with an integrated luminosity of 3.2 /fb. The photons were reconstructed for photon transverse energies larger than 125 GeV. The jets were identified using the anti-kt algorithm with radius parameter R=0.4 and selected in the rapidity...
The heavy quark doublet plays a central role in the quest for new physics. The complementary between studies of electroweak top quark production and bottom quark production is therefore intuitively clear and pointed out in the literature. Let us remind that the tension between the LEP measurement and the Standard Model prediction of the forward-backward asymmetry $A_{fb}^b$ is still one of the...
It is demonstrated that Gounaris-Sakurai model of the pion electromagnetic form factor is based on the P-wave iso-vector $\pi\pi$ scattering phase-shift given by a generalized effective-range formula of the Chew-Mandelstam type, valid exclusively only at the elastic region up to $1 GeV^2$. Therefore the Gounaris-Sakurai model is justified to be used in a determination of the $\rho(770)$ meson...
Hadronic signatures are critical to the high energy physics analysis program, and are broadly used for both Standard Model measurements and searches for new physics. These signatures include generic quark and gluon jets, as well as jets originating from b-quarks or the decay of massive particles (such as electroweak bosons or top quarks). Additionally missing transverse momentum from...
The transverse momentum spectra, $d^{2}\sigma/(d\eta dp^2_T)$, of charged hadrons produced in various high energy interactions ($pp$, $γp$, $γγ$, heavy-ion collisions) and measured in different experiments from ISR to LHC are considered simultaneously within several phenomenological models. As a result, the recently introduced "two component model" is shown to provide a much better description...
Australia has a rapidly growing high energy physics community members of which contribute broadly to outreach within the country and internationally. This talk will cover activities such as the Masterclass initiative which is being trialled by the government of New South Wales. With ongoing support from researchers who "meet" with the students via teleconference we are testing providing the...
We present an automatic procedure developed to reconstruct electromagnetic (EM) showers in the nuclear emulsions of the OPERA long baseline neutrino experiment.
OPERA was designed to investigate muon neutrino oscillations using so called Emulsion Cloud Chambers (ECC). Electronic detectors completed the ECC, where lead plates constituting the target mass were interleaved with nuclear emulsion...
The associated production of the Higgs boson with top quarks (ttH) allows to constrain the top Yukawa coupling. This coupling is a key parameter of the Standard Model and its direct study through the ttH production mode is one of the most challenging in the ATLAS physics program at LHC.
An explorative analysis for this process has been performed using Run2 data recorded by the ATLAS detector...
Abstract: We present a search for dark matter particles produced in association
with a hadronically decaying W or Z boson. The analysis is performed with
36.5/fb of proton-proton collision data at a centre-of-mass energy of 13 TeV
recorded by the ATLAS detector at the Large Hadron Collider. With the full 13
TeV dataset and an increased signal acceptance, this result significantly
improves over...
Particle Physics Masterclasses are a successful tool to engage high-school students with high energy physics. Young people become scientists for one day and perform a tailor-made physics analysis involving real LHC data under the supervision of physicists. In this way students experience methods and tools used in research and gain an appreciation for fundamental science is created. The...
We propose a new method for calculating the dependences of the decay constants of heavy-light mesons on the light-quark mass $m$ based on QCD sum rules at infinitely large Borel mass parameter. For an appropriate choice of the correlation functions, all condensate contributions vanish and the $m$-dependence of the decay constants is shown to be mainly determined by the known analytic...
Many exotics and SUSY models include particles which are long lived resulting in decays which are highly displaced from the proton-proton interaction point (IP). The standard track reconstruction algorithm used by the ATLAS collaboration is optimized for tracks from “primary” particles, which originate close to the IP. To this end, tight restrictions on the transverse and longitudinal impact...
The ATLAS Tile Calorimeter (TileCal) is the central section of the hadronic calorimeter of the ATLAS experiment at CERN’s Large Hadron Collider. This sampling calorimeter uses steel plates as absorber and scintillating tiles as active medium.
The light produced by the passage of charged particles is transmitted by wavelength shifting fibres to photomultiplier tubes (PMTs) located on the...
The consistent simultaneous interpretation of pions and kaons both as bound states of quark and antiquark and as the (almost) massless boson states related, according to Goldstone’s theorem, to the dynamical (and explicit) breakdown of the chiral symmetries of QCD still represents a major challenge. Applying inversion to sufficiently simplified versions of the homogeneous Bethe–Salpeter...
The LUCID detector is the main luminosity provider of the ATLAS experiment and the only one able to provide a reliable luminosity determination in all beam configurations, luminosity ranges and at bunch-crossing level. LUCID was entirely redesigned in preparation for Run 2: both the detector and the electronics were upgraded in order to cope with the challenging conditions expected at the LHC...
The status of $CP$ violations in charm sector is still unsettled.
According to SM, the predicted asymmetries are small, but often affected
by large uncertainties due to long-distance effects. However, it is
possible to build observables which SM predicts to be $CP$-conserving, so
that any measured asymmetry is undoubtedly a sign of New Physics. We
present the analysis of $CP$-asymmetries of...
Analysis of anisotropies in the arrival directions of galactic protons, electrons and positrons has been performed by the AMS on the International Space Station. An absolute anisotropy measurement has been performed with protons, electrons and positrons. These, together with the results of the anisotropy analysis of the electron to proton, positron to proton, and the positron to electron...
Utilizing powerful nuclear reactors as anti-neutrino sources, high mountains to provide ample shielding from cosmic rays in the vicinity, and functionally identical detectors with large target volume for near-far relative measurement, the Daya Bay Reactor Neutrino Experiment has achieved unprecedented precision in measuring the neutrino mixing angle $\theta_{13}$ and the neutrino mass squared...
The studies on the properties of Higgs boson in H->ZZ->4l (l = e, μ) and H->WW->eνμν decay channels based on the data collected with the CMS experiment in Run2 are presented. The reported results include studies of the Higgs boson production modes using H->ZZ and H->WW decay channels, as well as measurements of the Higgs boson mass, signal strength, fiducial differential cross sections for its...
Decays of the Z boson in the Standard Model violate parity, leading to a net polarization of the decay products. Z boson decays to pairs of tau leptons provide a unique opportunity to measure the tau polarization by using the kinematics of the subsequent tau decays, hence testing the Standard Model predictions. They also provide a unique opportunity to pioneer experimental techniques that...
The dijet production cross section for jets containing a b-hadron (b-jets) has been measured in
proton--proton collisions with a centre-of-mass energy of 7 TeV, using the ATLAS
detector at the LHC. The data used correspond to an integrated luminosity of 4.2/fb.
The cross section is measured for events with two identified b-jets with a transverse
momentum pT > 20 GeV. At least one of the jets...
In this poster we present measurements of normalized differential top quark pair (ttbar) production cross sections using final states with two leptons (ee, mumu, and emu) in proton-proton collisions at sqrt(s) = 13 TeV at the CERN LHC. The data were recorded in 2015 with the CMS detector and correspond to an integrated luminosity of 2.2 fb−1. The ttbar production cross section is measured as a...
Measurements of low-energy $e^+e^-$ hadronic cross sections are of fundamental importance because of the approximately three sigma discrepancy between the current measured value of the muon anomalous magnetic moment (g-2) and the Standard Model prediction.
By means of the initial-state-radiation technique, we present the first measurements of the $e^+e^- \to K_S K_L \pi^0$, $K_S K_L \eta$ ...
This poster presents the measurement of the inclusive top-quark pair-production cross-section in the lepton+jets channel with 20.2 fb-1 of 8 TeV data collected with the ATLAS detector at the LHC, using a neural-network discriminant and the reconstructed mass of the hadronically decaying W boson. Events are selected by requiring at least four jets, where at least one of the jets is required to...
Tau leptons play an important role in many Standard Model and Beyond the Standard Model physics processes that are being investigated at the LHC. This poster details measurements of the performance of the reconstruction and identification of hadronic tau lepton decays using the ATLAS detector. The measurements include the performance of the identification, trigger, energy calibration and...
Charm quarks possess large masses and thus they are expected to be primarily produced at the initial stages of heavy-ion collisions. Hot and dense nuclear matter, usually referred to as the Quark-Gluon Plasma (QGP), can also be created in these collisions. Therefore, the QGP can be studied using charm quarks as penetrating probes via the in-medium energy loss, which is deeply related to the...
A measurement of the inclusive and differential fiducial cross section of Higgs-boson production in the four lepton (electrons or muons) final state
is presented. The data sample, collected by the ATLAS experiment in 2015
and 2016, corresponds to an integrated luminosity of 36.1 fb$^{-1}$ of
proton-proton collisions produced at the Large Hadron Collider at a
centre-of-mass energy of 13 TeV....
The major goals of the NICA/MPD Project is the study of the in-medium properties of hadrons and the nuclear matter equation of state, including a search for possible signals of decofinement and/or chiral symmetry restoration phase transitions and the QCD critical endpoint in the region of the collider energy √sNN = 4 - 11 GeV. The basic strategy is to measure a large variety of signals...
Electromagnetic properties of massive neutrinos [1] and their effects on neutrino oscillation phenomena are brought into focus. The searches for neutrino millicharges, charge radii and magnetic moments in astrophysics and laboratory measurements are outlined [2,3]. Prospects of probing these neutrino characteristics with JUNO are discussed.
[1] C. Giunti and A. Studenikin, *Neutrino...
The origin of neutrino oscillations phenomena emerges due to coherent superposition of different neutrino states. Such superposition can be destroyed by quantum decoherence that appears from entanglement of neutrino
with environment. This quantum decoherence can cause suppression of different neutrino oscillations. In this work we study suppression of neutrino-antineutrino oscillations as a...
It was shown for the first time in [1] (see also [2,3]) that neutrino spin (and spin-flavor) precession can be engendered not only by neutrino interaction with the transversal magnetic field but also by neutrino interaction with matter
when there is a transversal matter current or matter polarization. Recently this effect has attracted reasonable interest within studies of neutrino fluxes from...
In preparation for the High Luminosity LHC, GEM detectors will be installed during Long Shutdown 2 (2018-2019) in the forward region of 1.6 < |eta| < 2.2 to improve trigger and tracking performance in the muon endcap, and maintain sensitivity to low pT muons. During the 2016-2017 year-end technical stop, five pairs of triple-foil GEM detectors were installed on the minus endcap of CMS as a...
Our presentation will be based on our recent paper [1].
We construct a new, simple model of the heavy ion collision.
This model is local in the impact parameter plane and appropriate for the SPS
energy range. It can be regarded as a new realization of the ``fire-streak'' approach, originally applied to studies of lower energy nucleus-nucleus reactions.
Starting from local energy and momentum...
We demonstrate explicitly that the $f^F,f^D,f^S$ coupling constants in the SU(3) invariant interaction Lagrangian of the vector-mesons with $1/2^+$ octet baryons does not depend on the choice of the $\omega-\phi$ mixing configuration.
The use and advantages of Receiver operating characteristic (ROC) curve for a binary classification is discussed in the context of a high energy physics classification problem. In particular, we look into the crucial task of obtaining the optimal cutoff or operating point using the curve for a multidimensional data and propose a novel method to obtain it. The results are illustrated using a...
The coherent inelastic processes of the type $a \rightarrow b$, which may take place in the interaction of hadrons and $\gamma$ quanta with nuclei at very high energies (the nucleus remains the same), are theoretically investigated. For taking into account the influence of matter inside the nucleus, the optical model based on the concept of
refraction index is applied. Analytical formulas for...
In Run 2 at CERN's Large Hadron Collider, the ATLAS detector uses a two-level trigger system to reduce the event rate from the nominal collision rate of 40 MHz to the event storage rate of 1 kHz, while preserving interesting physics events. The first step of the trigger system, Level-1, reduces the event rate to 100 kHz with a latency of less than 2.5 μs. One component of this system is the...
The identification of b-quark initiated jets (b-tagging) is a fundamental tool for the physics of ATLAS. Such jets can be discriminated from those produced by the hadronization of light and charm quarks based on characteristic properties of B hadrons, such as the long lifetime and the hard fragmentation function. The algorithms are based either on the identification of tracks displaced from...
The protoDUNE Single Phase (protoDUNE-SP) TPC is a prototype for the DUNE far detector and it is currently under construction at CERN. It will not only serve as a test-bed for the engineering design and construction techniques but will also provide a set of key measurements for the future DUNE far detector.
The new H4 extension beam-line at CERN will provide electron, muon and hadron beams...
The Monte Carlo setups used by ATLAS to model boson+jets and multi-boson
processes at $\sqrt{s}$ = 13 TeV in $pp$ collisions are described. Comparisons between data and several events generators are provided for key kinematic distributions. Issues associated the evaluation of systematic
uncertainties are also discussed.
The characterisation of the Higgs boson discovered in 2012 around 125 GeV, and confirmed with the data collected in Run II, requires the precise determination of its mass, width and couplings. The electromagnetic calorimeter (ECAL) of the Compact Muon Solenoid Experiment (CMS) is crucial for measurements in the highest resolution channels, H->gamma gamma and H->4 leptons. In particular the...
The Level-1 Muon Barrel Trigger is one of the main elements of the event selection of the ATLAS experiment at the Large Hadron Collider. It exploits the Resistive Plate Chambers (RPC) detectors to generate the trigger signal. The RPCs are placed in the barrel region of the ATLAS experiment: they are arranged in three concentric double layers and operate in a strong magnetic toroidal field. RPC...
Good photon identification capabilities are important for many aspects of the ATLAS physics program, from
Higgs boson measurements to new physics searches. The identification of prompt photons and the rejection
of background coming mostly from photons from hadron decays relies on the high granularity of the ATLAS calorimeter.
Several methods are used to measure with data the efficiency of the...
he High Luminosity-Large Hadron Collider (HL-LHC) is expected to start in 2026 and to provide an integrated luminosity of 3000 fb-1 in ten year, a factor 10 more than what will be collected by 2021.
This high statistics will allow to perform precise measurements in the Higgs sector and improve searches of new physics at the TeV scale.
The luminosity needed is L ~7.5 1e34 cm-2 s-1,...
The general consequences of $T$ invariance for the direct
and inverse binary reactions $a + b \rightarrow c + d$ ,
$c + d \rightarrow a + b$ with spin-1/2 particles $a$, $b$
and unpolarized particles $c$, $d$ are analyzed.
Using the formalism of helicity amplitudes, the theoretical study of polarization
effects in the reaction $p + \,^{3}{He}
\rightarrow \pi^{+} + \,^{4}{He}$ and in the...
Spin correlations for the $\Lambda\Lambda$ and
$\Lambda\bar{\Lambda}$ pairs, produced in relativistic heavy-ion collisions, and related angular correlations at the joint registration of space-parity nonconserving hadronic decays
of two hyperons are theoretically analyzed. These correlations give important information about the character and mechanism of multiple processes, and the advantage of...
We present the precise monthly time variation of the e+, e-, p and He fluxes by the Alpha Magnetic Spectrometer on the International Space Station. The data were collected during the ascending phase of solar cycle #24 through its maximum and toward its minimum. This covers one half solar cycle. For the ?first time, the time evolution of cosmic rays of opposite charges and different mass and...
For several years, a team of 20 scientists from ESRF, IPHC Strasbourg, IPN Lyon and LPSC Grenoble has been working to study the detection properties of large-size diamond detectors from several suppliers, with the aim of achieving reliable & efficient sensors for particle tracking or medical applications. High radiation hardness and intrinsic electronic properties make diamonds reliable & very...
Antimatter nuclei in cosmic rays (CRs) represent a promising tool for the indirect search of dark-matter particles in the Galaxy.
At this conference, we report updated calculations for the astrophysical production of CR antiproton, antideuteron, and antihelium nuclei using updated cross-section formulae and new astrophysical constraints inferred from the recent AMS-02 data on CR protons and...
The Feedback On Nanosecond Timescales (FONT) Group has developed low-latency beam feedback systems for providing bunch-by-bunch beam position correction capability for Linear Colliders. Prototype feedbacks have been deployed and tested at the KEK ATF2 facility, where they have been extended for use in stabilising the vertical position of the electron beam in the upstream and interaction-point...
Precision measurements by AMS of fluxes and flux ratios of charged elementary particles in cosmic rays are presented. In the absolute rigidity range ∼60 to ∼500 GV, the antiproton, proton, and positron fluxes are found to have nearly identical rigidity dependence while the electron flux exhibits a different rigidity dependence. Below 60 GV, the antiproton-to-proton, antiproton-to-positron, and...
This poster presents the latest measurements of the Higgs boson properties measured in the H → γγ decay channel using 36.1fb −1 of proton-proton collision data taken at √ s = 13TeV by the ATLAS experiment at the LHC. Fiducial and differential cross section measurements are presented in a variety of phase space regions and as a function of several kinematic variables, to be compared with the...
The prospects for particle-physics experiments based on an AWAKE-like electron acceleration scheme will be reviewed. These include high energy electron test beams, searches for very weakly interacting particles in fixed target experiments as well as electron-proton and electron-ion colliders covering a wide range of energies up to a very high energy electron-proton (VHEeP) collider with...
The role of quantum groups, a particular class of Hopf algebras, as describing the fundamental symmetries of the Standard Model is investigated. Using the quantum group SUq(3) as a flavour symmetry leads to exceptionally accurate baryon mass sum rules that agree perfectly with experimental data and magnetic moments that agree significantly better with experimental data.
The consideration of...
At LHC, the design luminosity, 1034 cm-2 s-1, has already been reached during Summer 2016. LHC is planning, in the short term future, to further enhance the luminosity, resulting in a higher trigger frequency and an increased pileup. These factors constitute a challenge for the data readout since the rate of data to be transmitted depends on both pileup and trigger frequency. In the ATLAS...
In the framework of the Masterclass of particle physics in Pisa, each year a questionnaire is given to the students to assess if the Masterclass met a positive response.Together with specific questions about the various activities they took part in during the Masterclass day, we ask them if they would like to become a scientist. They are offered 15 possible motivations for a “yes” or a “no” to...
The latest results of the search for a high mass scalar boson using the 13TeV proton-proton collision data acquired by the CMS experiment in 2016 will be presented. In particular, this poster will be focused on the decay channel H->ZZ->llvv selected from data corresponding to an integrated luminosity of 35.9/fb. An analysis of the reconstructed transverse mass and missing transverse energy is...
The existence of Dark Matter is inferred from several astrophysical and
cosmological observations. Several extensions of the Standard Model
accommodating Dark Matter constraints predict associated production of Dark
Matter particles with the Standard Model Higgs boson. Such models are searched
for in final states with large missing transverse momentum and a Higgs boson
decaying to a pair of...
Supersymmetry is one of the most motivated Standard Model extensions. Despite the meticulous search during the LHC Run I, there is no evidence supporting this theory. Starting from 2015, LHC is performing a second data taking run with a higher center of mass energy (13 TeV), providing a great occasion for the search of beyond the Standard Model physics. New results obtained with the 2015-2016...
Several possible extensions of the Standard Model predict the existence of a dark sector that is weakly coupled to the visible one: i.e. the two sectors couple via the vector portal, where a dark photon with mass in the MeV to GeV range mixes kinetically with the SM photon. If the dark photon is the lightest state in the dark sector, it will decay to SM particles, mainly to leptons and...
Supersymmetry is able to solve a number of questions the celebrated standard model of particle physics has left unresolved. Particle collision experiments such as CMS, located at the CERN LHC, perform searches for the existence of supersymmetry in proton-proton collisions in a variety of different final states. In this poster, the results of the search for electroweak production of SUSY in...
This poster presents the results of a search for gluinos and squarks in events with exactly one lepton in the final state in addition to multiple jets and large missing transverse momentum. The analysed ATLAS data from 2015 and 2016 corresponds to an integrated luminosity of 36.1 fb$^{-1}$ at a centre-of-mass energy of 13 TeV. In addition to previous publications the latest results contain a...
A search for heavy pseudoscalar ($A$) and scalar ($H$) Higgs
bosons decaying into a top-quark pair ($t\bar{t}$) has been performed in
20.3~fb$^{-1}$ of data collected by the ATLAS experiment at the Large
Hadron Collider in proton--proton collisions at a center-of-mass energy of
$\sqrt{s} = 8$~TeV. No significant deviation from the Standard Model
expectation is observed in the $t\bar{t}$...
A search for new high mass resonances which decay to two high-$p_{\rm T}$
leptons with same-sign charge is presented. The results reported here use the
\textit{pp} collision data sample corresponding to 36.5 fb$^{-1}$ of integrated
luminosity collected in 2015 and 2016 by the ATLAS detector at the LHC with a
centre-of-mass energy of 13 TeV. The search considers the pair production of a
doubly...
The latest results of the search for MSSM Higgs boson decaying into two tau leptons with the full 2016 data will be presented. The analysis is performed using the dataset recorded by the CMS experiment at the LHC from pp collisions at centre-of-mass energies of 13 TeV corresponding to an integrated luminosity of 35.9/fb.
Many well established models extending beyond Standard Model (e.g. Grand Unified Theory, Sequential Standard Model or models proposing extra spatial dimension(s)) predict the existence of new heavy neutral bosons that would decay in two leptons. A search for new narrow resonances, generically referred as Z', in the dimuon decay channel has been performed using data collected by the CMS...
New high-mass scalar states decaying into two photons are predicted in many extensions of the Standard Model. The diphoton final state provides a clean experimental signature with excellent invariant mass resolution and moderate backgrounds.
A search for such states with masses above 200 GeV is presented here, using 37 fb-1 of data collected by the ATLAS experiment in 2015 and 2016 at...
A search for new phenomena in ttbar final states with additional heavy-flavour
jets has been carried out using 36.1 fb-1 data of pp collisions at sqrt(s) = 13
TeV with the ATLAS detector at the LHC. The search targets a variety of signals,
including the pair production of a vector-like top quark; four-top-quark
production in several new physics scenarios. Data are analysed in...
Permanent electric dipole moments (EDMs) of fundamental particles provide powerful probes for physics beyond the Standard Model. We propose to search for the EDM of strange and charm baryons at LHC, extending the ongoing experimental program on the neutron, muon, atoms, molecules and light nuclei. The EDM of strange $\Lambda$ baryons, selected from weak decays of charm baryons produced in $pp$...
Narrow resonances decaying into $WW$, $WZ$ or $ZZ$ boson pairs are searched for
in 37.1 fb$^{-1}$ of proton-proton data at a centre-of-mass energy of
$\sqrt{s}=13$TeV recorded with the ATLAS detector at the Large Hadron Collider
in 2015 and 2016. The diboson system is reconstructed using pairs of
high-$p_{\mathrm{T}}$ large radius jets tagged as compatible with the boosted
hadronic decay of a...
This poster presents the run 2 search for di-Higgs production in the yybb channel. In the Standard Model, this process provides a lens on the Higgs self-coupling and it is enhanced, resonantly or non-resonantly, in many extensions to the SM. It is appealing thanks to a clean diphoton trigger, relatively small backgrounds, and excellent diphoton mass resolution. It is also particularly...
During Run-1 of the Large Hadron Collider, a particle consistent with the Standard Model Higgs boson was observed coupling directly to the leptonic and bosonic sectors of the Standard Model. The decay of the Standard Model Higgs to bbbar is the most commonly occurring decay mode, with a branching fraction of approximately 58%. Probing this decay is vital to furthering our understanding of the...
A search for photonic signatures of various generalised models of gauge-mediated supersymmetry breaking is presented at proton--proton collisions at a centre-of-mass energy of 13 TeV. The results are based on an integrated luminosity of 36.1 fb-1 recorded by the ATLAS detector at the LHC. Different experimental signatures incorporating one or more isolated photon and significant missing...
We present searches for supersymmetry in the all-hadronic final state using a customized top tagger. The focus of the studies is on the direct pair production of third-generation squarks. The analysis is performed using the data set recorded by the CMS
experiment at the LHC in pp collisions at a center-of-mass
energies of 13 TeV, with an integrated luminosity of 35.9 1/fb.
The results are...
B mesons are the lightest mesons which can decay to various final states containing different baryons. Up to now, the discrepancy between the inclusive branching fraction of all B meson decay modes with at least a couple of baryons in the final state, measured by ARGUS to be (6.8+−0.6)% , and the sum of exclusive baryonic channels, averaged on neutral and positive B mesons at less than 1%,...
The Yukawa coupling of the Higgs boson to the top quark is a key parameter of the Standard Model. It can be constrained using the associated production process pp → ttH + X.
A search for this process using final states with multiple leptons, primarily targeting the decays H→ WW∗ and H → ττ, has been performed using the data set recorded by the ATLAS detector in 2015 and 2016 at a center of...
In 2012, the ATLAS and CMS Collaborations announced the discovery of a new state with a mass around 125 GeV, compatible with the Standard Model Higgs boson. The measurements of this new particle’s properties, in particular its couplings to other elementary particles, are important to test the predictions of the Standard Model.
In this poster, the coupling of the Higgs boson with beauty quarks...
A search for the standard model Higgs boson is presented in the Vector Boson Fusion production channel with decay to bottom quarks. A data sample comprising 35.9 fb^−1 of proton-proton collision at sqrt(s) = 13 TeV collected during the 2016 running period has been analyzed. Production upper limits at 95% Confidence Level are derived for a Higgs boson mass of 125 GeV, as well as the fitted...
Supersymmetry (SUSY) still remains one of the most interesting theories which are candidates to describe physics beyond the Standard Model, even if the latest Run1 results and interpretations have so far shown no experimental evidence for the existence of superparticles. If SUSY exists, the strong production of coloured SUSY particles is expected to be the dominant production process at the...
Although no experimental evidence has been found during LHC Run1, supersymmetry (SUSY) remains one of the most promising and motivated Standard Model extensions. Focusing the attention on its minimal formulation, the Minimal Supersymmetric Standard Model (MSSM), where the multiplicative quantum number R-parity is conserved, the latest results in searching for pair production of top squarks...
Natural supersymmetry suggests a relatively light top squark, which is the supersymmetric partner of the top quark, with a mass that might be within the discovery reach of the LHC.
A search for direct top squark pair production, in final states with one isolated electron or muon, multiple jets and missing transverse momentum, is presented. The analysis is performed using data from...
One of the most important parameters in supersymmetry is the mass of the supersymmetric partner of the third generation quarks. The scalar top quark mass lighter than 1 TeV is favored in many theories, but no evidence has not been found in the previous searches. Therefore the search needs to be performed more extensively considering various LSP scenarios with increased integrated luminosity....
The associated production of the Higgs boson with a pair of top/anti-top quarks (ttH) is the only process providing the direct access to the measurement of the Yukawa coupling between the Higgs boson and the top quark. The presented results exploit the data collected during 2015 and 2016 by the ATLAS experiment during LHC collisions at a center-of-mass energy of 13 TeV. Multivariate...
Searches in CMS for dark matter in final states with invisible particles recoiling against leptons and photons are presented. Various topologies are explored, covering several specific dark-matter production modes. The talk focuses on the recent results obtained using data collected in the 2016 run of the LHC.
This poster presents the results from the Mono-Higgs analyses performed with the CMS experiment at the LHC using the full 2016 data set. The results are interpret in canonical Dark Matter models.
Recent results on searches for exotic production and decays of the Higgs boson H(125) are presented. The current status of the searches for invisible and quasi invisible decays, lepton flavour violation (emu, etau, mutau) decays, decays to light scalars will be reviewed.
A lot of progress on the study of the properties of the Higgs boson has been made since its discovery, however little is still known about the Higgs boson couplings to light quarks. Direct measurements of the Higgs boson decays to pairs of light-quarks are challenging due to the overwhelming hadronic backgrounds. A new window to experimentally access these couplings opens through the search...
Weak heavy mesons decays are candidate processes for new physics manifestation. Their theoretical description requires an appropriate treatment of hadronic effects. Because of their non-perturbative nature, they are usually treated in some model-dependent way. Focusing on several weak heavy mesons decays, we will present the confined covariant quark model and demonstrate its features. Our...
How much information is added to the Review of Particle
Physics when a new decay branching ratio of a hadron is measured and
reported? This is quantifiable by Shannon's information entropy. It may
be used at two levels, the distribution of decay-channel probabilities,
and the distribution of individual quantum-state probabilities
(integrating the later provides the former). We illustrate...
The gauge symmetry of the Standard Model is SU(3)×SU(2)×U(1) on unknown reasons. One aspect that can be addressed is the low dimensionality of all its subgroups. Why not much larger groups like SU(7), or for that matter, SP(38) or E7?
We observe that fermions charged under large groups acquire much bigger dynamical masses, all things being equal at a high e.g. GUT scale, than ordinary quarks....
In order for supersymmetry to stabilise the Higgs boson mass, the mass of the scalar partner of the top quark (the stop) is required to be below around 1 TeV. The decay of the stop depends on the mass difference between the stop itself and the lightes neutralino, assumed to be stable. Scenarios where this mass difference is small are usually referred to as “compressed”. This poster presents a...
Among the many challenges to be brought by the high luminosities of the HL-LHC is the impact of increased hit rates in the cathode strip chambers of the CMS endcap muon system. These chambers are used for all levels of trigger as well as offline reconstruction. Neutrons (both fast and thermal) induce background hits via nuclear interactions and capture, followed by gamma emission and (mainly)...
The RPC system at the CMS Detector is operating successfully from beginning of the data taking. The high instantaneous luminosity causes an extremely high flux of ionizing particles. The long period of operation (Run1 and Run2) in a huge radiation background conditions, gives the opportunity to study the operation capability of the RPCs and also to predict a data-driven extrapolation about the...
The most recent results from CMS on the study of the SM Higgs boson decaying into a tau pair will be presented. The search, which makes use of full 2016 dataset, is performed.
Measuring triboson final states at the Large Hadron Collider provides a test of the non-Abelian structure of the Standard Model of particle physics. This structure gives rise to self-interactions of the electroweak gauge bosons and the SM predicts the exact strength of these couplings of the gauge bosons. Any observed deviation from the SM expectations would imply the existence of physics...
We show latest results of SUSY fits from the MasterCode collaboration, and the status of the recast of ATLAS and CMS 13 TeV SUSY searches being incorporated in coming analyses.
Supersymmetry (SUSY) is one of the most studied theories to extend the Standard Model (SM) beyond the electroweak scale. If R-parity is conserved, SUSY particles are produced in pairs and the lightest supersymmetric particle (LSP), which is typically the lightest neutrino chi_0^1, is stable. In many models the LSP can be a suitable candidate for dark matter. This poster presents a search for...
LaBr3:Ce crystals and later CeBr3, PrLuAG and Ce:CAAG have been introduced for radiation imaging in medical physics, with photomultiplier or single SiPM readout (up to 3x3 mm2). An R&D was pursued with different types of crystals to realize compact large area detectors (up to some cm2) with SiPM array readout, aiming at high light yields, good energy resolution, good detector linearity and...
CP violation in weak interactions is well-established in Particle Physics. Nevertheless, the most recent combination of all CP violation measurements is found to be insufficient to explain the size of the matter-antimatter asymmetry present in the Universe. The large number of top-antitop pair events produced in pp collisions at the Large Hadron Collider (LHC) provides a unique source of...
We investigate new gram-scale cryogenic detectors, 1-2 orders of magnitude smaller in size than previous devices. These are expected to reach unprecedentedly low energy thresholds, in the 10 eV-regime and below. This technology allows new approaches in rare-event searches, including the search for MeV-scale dark matter, detection of solar neutrinos and a rapid discovery of coherent...
BM@N (Baryonic Matter at Nuclotron) is the first experiment to be realized at the accelerator complex of NICA-Nuclotron at JINR (Dubna, Russia). The aim of the experiment is to study interactions of relativistic heavy ion beams with energy up to 5.5 AGeV with fixed targets. The research program of the experiment includes studies of strange mesons, multi-strange hyperons and light hyper-nuclei...
The Compact Muon Solenoid (CMS) experiment implements a sophisticated two-level triggering system composed of the Level-1, instrumented by custom-design hardware boards, and a software High-Level-Trigger. A new Level-1 trigger architecture with improved performance is now being used to maintain the thresholds used in LHC Run I for the more challenging conditions experienced during Run II. We...
The CMS experiment implements a sophisticated two-level triggering system composed of Level-1, instrumented by custom-design hardware boards, and a software High-Level-Trigger. A new Level-1 trigger architecture with improved performance is now being used to maintain the thresholds that were used in LHC Run I for the more challenging luminosity conditions experienced during Run II. The...
The CMS experiment, located at the CERN Large Hadron Collider, has a redundant muon system composed by three different detector technologies: Cathode Strip Chambers (in the forward regions), Drift Tubes (in the central region), and Resistive Plate Chambers (both in the central and forward regions). The RPCs are designed mainly as a trigger detector but they contribute also to the muon...
The Cryogenic Underground Observatory for Rare Events (CUORE) is a ton-scale Neutrino-less Double Beta Decay experiment that uses 998 TeO2 crystal bolometers that need to be operated at a baseline temperature of around 10 mK. The large volume and masses involved require a dedicated precooling system that allows the apparatus to reach a threshold temperature after which the Dilution Unit, a...
The MEG experiment, at the PSI in Switzerland, aims at searching the charged lepton flavor violating decay $\mu^{+}\rightarrow e^{+}\gamma$. MEG has already determined the world best upper limit on the branching ratio: BR<4.2$\times10^{-13}$@90\%CL with the full data set collected in the years 2009-2013.\
The new positron tracker is a high transparency single volume, full stereo cylindrical...
We investigate the influence of the fourth generation of quarks on the CP-asymmetry in $B_s \rightarrow \phi \ell^+\ell^-$ Decay.
This new quarks changes the values of the Wilson coefficients $C_7(\mu)$, $C_9(\mu)$ and $C_{10}(\mu)$ via virtual exchange of the fourth generation up type quark $t^\prime$.
Taking the $|V_{tb} V^*_{ts}| \sim$ $\{0.01-0.03\}$ with phase $\{60,90,120\}$
, which is...
Euclid is an ESA mission designed to explore the dark side of the Universe and to understand the nature of the dark energy responsible for the accelerated expansion of the Universe. Its objective is to map the geometry of the dark Universe by investigating the distance-redshift relationship and the evolution of cosmic structures.
By measuring two cosmological probes simultaneously, the Weak...
The latest results of the measurement of the Higgs boson decaying into two photons with the full 2016 data will be presented. The analysis is performed using the dataset recorded by the CMS experiment at the LHC from pp collisions at centre-of-mass energies of 13 TeV corresponding to an integrated luminosity of 35.9 1/fb.
Producing the very large samples of simulated events required by many physics and performance studies with the ATLAS detector
using the full Geant4 detector simulation is highly CPU intensive. Fast simulation tools are a useful way of reducing CPU requirements when detailed detector simulations are not needed. During the LHC Run-1, a fast calorimeter simulation (FastCaloSim) was successfully...
Icarus is the largest imaging LAr TPC ever operated. During its LNGS run on the CNGS neutrino beam, from 2010 to 2013, produced some thousands neutrino events of unprecedented quality. This was possible thanks its mechanical precision and stability, liquid argon purity and electronics front-end and DAQ. In this poster the last issue (front-end and DAQ) will be presented in detail. Actually...
Using the analogy with the problem of ionization and
excitation of atoms at the propagation of relativistic charged particles through matter, the process of Coulomb dissociation
of weakly bound relativistic nuclei and hypernuclei is theoretically investigated in the framework of the two-cluster deuteron-like model. Explicit expressions for the total cross-section of Coulomb disintegration of...
In this contribution, we briefly analyze the formalism of the unquenched quark model (UQM) and its application to calculate the mass shifts of ground-state octet and decuplet baryons due to the coupling to the meson-baryon continuum. We describe the electro-production of Baryon-Meson states from proton in the framework of the UQM. Finally, we discuss the strangeness suppression factor within...
The advanced $\Lambda$, $\Sigma$, $\Xi$ hyperon Unitary and Analytic electromagnetic structure models are constructed explicitly and behaviours of $|G_M^H(t)|$ and ratios $|G_E^H(t)|/|G_M^H(t)|$ are predicted in time-like region as functions of the total energy squared $t=W^2$ in the c.m. system of $H\bar H$, which will be found out in intended
measurements of the $\Lambda$, $\Sigma$, $\Xi$...
One of the very interesting aspects in the high energy heavy-ion collisions experiments and in nuclear astrophysics is a detailed study of the thermody- namic properties of strongly interacting nuclear matter far away from the nu- clear ground state. The main goal of this contribution is to show that thermo- dynamic instabilities and phase transitions can take place at nite net baryon density...
The identification of jets originating from the hadronisation of heavy-flavour quarks represents a key ingredient in the physics program of the ATLAS experiment. Exploiting the topological structure of weak b- and c-hadron decays, the multi-vertex finder algorithm - JetFitter - tries to reconstruct the full b-hadron decay chain inside b-jets and provides a complementary approach to...
Quantum Mechanics is being included in numerous school programmes as part of the curriculum. Most modern textbooks introduce it emphasising its strange or at least uncommon, somewhat paradoxical character. We argue that such an approach is wrong because rather than attracting the interest of students toward the topic, it makes it almost unbelievable and artificial. The resulting...
In high-energy physics experiments, track based selection in the online environment is crucial for the detection of physics processes of interest for further study. This is of particular importance at the Large Hadron Collider (LHC), where the increasingly harsh collision environment is challenging participating experiments to improve the performance of their online selection. Principle among...
Many extensions of the Standard Model (SM) include particles that are neutral, weakly coupled, and long-lived that can decay to final states containing several hadronic jets. Long-lived particles (LLPs) can be detected as displaced decays from the interaction point, or missing energy if they escape. ATLAS and CMS have performed searches at the LHC and significant exclusion limits have been set...
This paper explores effects of both finite width and interference (with background) in the production and decay of extra heavy quarks at the Large Hadron Collider (LHC). This dynamics is normally ignored in the standard experimental searcher and we assess herein the regions of validity of current approaches. Further, we discuss the configuration of masses, widths and couplings where the latter...
The production of jets in association with a W or a Z boson in proton-proton collisions is an important process to study QCD in multi-scale environments. Moreover, measurements of W/Z boson production associated with heavy- flavor (HF) quarks provide important experimental constraints to improve the theoretical description of these processes, as the uncertainties in the current predictions...
