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The Standard Model (SM), while extremely powerful as a description of the strong, electromagnetic and weak interactions, does not provide a natural candidate to explain Dark Matter (DM). Theoretical as well as experimental motivation exists for the existence of a hidden or dark sector of phenomena that couples either weakly or in a special way to SM fields. Hidden or dark sectors near the weak...
Talk on History of OAC Chapel and Meaning of Blessing. Blessing
The latest results on production of Higgs boson pairs at 13 TeV by the ATLAS experiment are reported, including a combination of six different decay modes. Results include bbtautau, bbbb, bbgamgam, bbWW, WWWW and WWgamgam final states, and they are interpreted both in terms of sensitivity to the SM and as limits on kappa_lambda, a scaling of the triple-Higgs interaction strength. Future...
In the past few years a number of new advanced machine learning tools and techniques have become available for data analysis. Besides offering improved ways to tackle old problems of interest to fundamental physics, such as event classification for signal enhancement, they also provide entirely new solutions to previously unapproachable issues. In this talk will be given an overview of...
The Compact Linear Collider (CLIC) is a mature option for a future electron-positron collider operating at centre-of-mass energies of up to 3 TeV. CLIC is foreseen in a staged approach with three centre-of-mass energy stages currently assumed to be 380 GeV, 1.5 TeV and 3 TeV. This contribution discusses the physics potential of CLIC in the area of Higgs physics based on benchmark analyses...
A large, worldwide community of physicists is working to realise an exceptional physics program of energy-frontier, electron-positron collisions with the International Linear Collider (ILC). This is an ideal collider for precision studies of the Higgs boson and searches for new physics beyond the Standard Model.The Higgs factory is recommended as the highest-priority next collider after CERN’s...
I will describe the weak gravity conjecture in flat and de Sitter space and the difficulties to obtain An accelerating Universe in string theory.
During the LHC Run 2, the CMS experiment recorded an integrated luminosity of proton-proton collision data corresponding to about 140 fb-1 at a center of mass energy of 13 TeV.
With such a large volume of dataset at an unprecedented energy, CMS has updated many physics searches.
Direct searches for new particles predicted by theories beyond the Standard Model (SM) have been pursued, touching...
We raise fundamental questions about the very meaning of conservation laws in quantum mechanics and we argue that the standard way of defining conservation laws, while perfectly valid as far as it goes, misses essential features of nature and has to be revisited and extended.
Many extensions to the Standard Model predicts new particles decaying into two bosons (W, Z, photon, or Higgs bosons) 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 and b-jets where new jet substructure techniques to disentangle the hadronic decay...
The discovery of the Higgs boson with the mass of about 125GeV completed the particle content predicted by the Standard Model. Even though this model is well established and consistent with many measurements, it is not capable to solely explain some observations. Many extensions addressing this fact introduce additional Higgs-like bosons which can be either neutral, singly-charged or even...
The unprecedented amount of data recorded by the ATLAS experiment during the LHC pp collision run at 13 TeV allows to search for rare decays of the Higgs boson. In addition, the sensitivity of searches for additional Higgs bosons is highly increased. The latest results on these topics will be presented.
The direct production of electroweak SUSY particles, including sleptons, charginos, and neutralinos, is a particularly interesting area with connections to dark matter and the naturalness of the Higgs mass. The small production cross sections lead to difficult searches, despite relatively clean final states.The ATLAS experiment is exploring this experimentally challenging frontier with the...
Supersymmetry (SUSY) provides elegant solutions to several problems in the Standard Model, and searches for SUSY particles are an important component of the LHC physics program. Naturalness arguments for weak-scale supersymmetry favour supersymmetric partners of the gluons and third generation quarks with masses light enough to be produced at the LHC. This talk will present the latest results...
We summarize the recent results from CMS searches for supersymmetric particles for Run 2 at CM energy of 13 TeV. Strong and weak production of SUSY scenarios in both R-parity conserving and R-parity violating supersymmetric scenarios are considered. Results are presented for the recent searches for squark and gluinos, direct production of charginos, neutralinos and sleptons. These searches...
Measurements that exploit electroweak boson scattering and electroweak boson fusion (VBF) processes have become increasingly common at the Large Hadron Collider in the last few years. In this talk, we present the observation of electroweak ZZjj production, evidence for electroweak Zyjj production and the first measurement of differential cross-sections for electroweak Zjj production. In...
Searches in CMS for dark matter particles, mediators, and dark sector extensions will be presented. Various final states, topologies , and kinematic variables are explored utilizing the full LHC Run-II data-set collected at the LHC.
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 programme to directly search for DM. ...
Photon-photon fusion is a rare process at hadron and ion colliders. It is particularly interesting as a remarkably clean interaction with little (if any) remnant activity from the interacting particles. In this talk, we present the status of photon-photon fusion measurements at the ATLAS detector. This includes the production of photon pairs via light-by-light scattering in heavy ion...
The ATLAS experiment has performed accurate measurements of mixing and CP violation with the neutral B mesons. This talk will focus on the latest results from ATLAS on the CP violation in Bs to Jpsi phi decays. The Standard Model predicts the CP violating phase, phi_s, to be very small and its SM value is very well constrained, while in many new physics models large phi_s values are expected....
The CMS Collaboration continues to work actively on developing the physics program for the High-Luminosity LHC (HL-LHC).
The HL-LHC will extend the LHC program to the second half of the 2030’s with pp collisions at 14 TeV with an integrated luminosity
of 3 ab$^{-1}$ each for ATLAS and CMS experiments, and PbPb and pPb collisions with integrated luminosities of 13 nb$^{-1}$ and 50...
The PANDA experiment (antiProton ANnihilation at DArmstadt) is one of the four key experiments to be operated at FAIR (Facility for Antiproton and Ion Research), which is currently under construction near Darmstadt/Germany. This fixed target experiment will address a wide range of open questions in the field of hadron physics. The detector consists of at target as well as a forward...
We review recent development of Wigner - Weyl calculus within quantum field theory. In particular, we discuss diagram technique in terms of Wigner transformed Green functions. This technique allows to study topological properties of non - dissipative transport in non - homogeneous systems including effects of interactions.
We study the dependence of electric conductivity on fermion chemical potential in finite-density $SU(2)$ gauge theory with $N_f = 2$ flavours of rooted staggered sea quarks and with Wilson-Dirac and Domain Wall valence quarks. We concentrate in particular on the vicinity of the crossover between the high-temperature and the low-temperature regimes, where we find the low-frequency electric...
The PHENIX detector at RHIC recorded heavy-ion data for 16 years, recently ending its run in 2016. The new sPHENIX detector currently being developed will be built in its place. Although PHENIX is no longer actively running, the last three years of operation collected data in a wide range of different collision systems: $p$+$p$, $p$+Al, $p$+Au, $^{3}$He+Au, and Au+Au, which are still being...
The Pierre Auger Observatory is the largest detector ever built to study the properties of ultra-high energy cosmic rays (UHECRs). Due to an unprecedented exposure accumulated since the start of the operation in 2004 and the use of the combination of the Fluorescence and Surface Detectors, the data set recorded by the Observatory is unrivaled both in size and quality. In these proceedings we...
R. Bernabei
Universita’ e INFN Roma Tor Vergata
Abstract
A very interesting topic of nuclear physics is the study of nuclear instability, which played so far an important role in the foundation and development of nuclear physics. In fact, it can offer information about the nuclear structure, the nuclear levels and the properties of nuclei. Here a review of recent experimental searches...
We review the properties of the strongly interacting quark-gluon plazma (QGP) created in heavy-ion collisions at ultrarelativistic energies, i.e. out-of equilibrium, and compare them to the equilibrium case. The description of the strongly interacting (non-perturbative) QGP in equilibrium is based on the effective propagators and couplings from the Dynamical QuasiParticle Model (DQPM) that is...
Cluster formation has been observed in high-energy heavy ion collisions at midrapidity. This phenomenon is presently highly debated because the transverse energy spectra at midrapidity show an inverse slope parameter of more than 100 MeV and look rather thermal. In such an environment, it is no expected that clusters with binding energies of below 10 MeV per nucleons can be created or can...
Top-quark production in proton-proton collisions at a center-of-mass energy of 13 TeV is measured with the data collected by the ATLAS detector over five orders of magnitude.
The relatively large inclusive cross-section for the production of top-quark pair production is determined using events in the lepton+jets channel and it reaches a relative uncertainty of 4.6% allowing for...
Many models predict the existence of new, heavy resonances that may decay in leptonic final states. This talk presents results from such searches that have been carried out in CMS using the full Run2 luminosity.
In this talk, we will present a selection of searches for new physics with the CMS detector, with a special emphasis on the most recent results obtained from the analysis of the full LHC Run 2 dataset and on new analysis techniques.
Recent results on Higgs boson physics by the CMS collaboration will be presented. Emphasis will be put on measurements and searches exploiting the full statistical power of the dataset collected during run2 of the LHC. The 137 fb^-1 of integrated luminosity gathered provide access to previously unreachable levels of precision, both in the measurement of the physical properties of the Higgs...
With the pp collision dataset collected at 13 TeV, detailed measurements of Higgs boson properties can be performed. This talk presents measurements of Higgs boson properties using various decay modes of the Higgs boson. The different production mode cross sections are determined, simplified template cross sections are measured, and interpretations of the results in different frameworks are obtained.
Various models of physics Beyond the Standard Model lead to signatures with long-lived particles, such that the decay of the new particle is at a significant distance from the collision point. These striking signatures provide interesting technical challenges due to their special reconstruction requirements as well as their unusual backgrounds. This talk will present recent results in searches...
Gravitational waves (GW) are ripples in the spacetime fabric, emitted by compact accelerating objects. On September 2015, a century after Einstein predicted the existence of GW, the first direct detection of GW from a binary black hole merger has been observed, thus opening a new window of observation on the Universe and marking the birth of GW Astronomy. This important result has been...
In 2016, LHCb collected 12.5 and 17.4 inverse nanobarns in pPb and Pbp collisions, respectively. These new high statistics samples are essential to study the CNM effects and to disentangle them from those associated with QGP formation in PbPb collisions. The LHCb forward geometry provides coverage over two independent rapidity ranges in the centre-of-mass frame when the p and Pb beams are...
We continue our study of shear viscosity of nuclear matter in the central zone of central Au+Au collisions at NICA energies. Calculations are done within the UrQMD model both for dynamic case of A+A collisions and for the box with periodic boundary conditions to study the relaxation process and determine the damping rates. Statistical model of ideal hadron gas helps us to extract temperature...
About a year ago launched SRG carries eROSITA and ART-XC X-ray telescopes
on board and will contribute considerably to cosmology by investigating
cosmic large scale structure properties associated with galaxy clusters. Four years of data taking will allow to observe all the galaxy clusters formed in
the visible Universe. At the same time SRG can reveal the nature of Unknown Components of...
Unlike projective measurements, weak measurements [1] enable to gather slight information about the measured system while avoiding in most cases its collapse. This unique property, enabled by the loose coupling between the measuring apparatus and the measured system, has opened up a plethora of conceptual and practical applications. After a brief introduction to this topic, partially based on...
The primary goal of the ultra-relativistic heavy-ion collision program at the Large Hadron Collider (LHC) is to study the properties of the Quark-Gluon Plasma (QGP), a novel state of strongly interacting matter which exists in the early universe. Anisotropic flow, which quantifies the anisotropy of the momentum distribution of final state particles, is sensitive to the fluctuating initial...
Motivated by the phenomenology of the heavy-ion collisions, we consider various processes in rotating and accelerated chiral media in equilibrium. There are two dual approaches to address the issues: field theory on a curved background and statistical approach in flat space, with the density operator taking on the most general form. On a few examples, we demonstrate the duality in case of...
The Nuclotron at the Joint Institute for Nuclear Research in Dubna will deliver gold beams with kinetic energies between 2 and 3.8 A GeV. In heavy-ion collisions at these energies, it is expected that the nuclear fireball will be compressed up to about four times the saturation density, which offers the opportunity to study properties of nuclear matter at neutron star core densities. The...
Scaling relations for anisotropic flow based on the data from beam energy scan experiments
In this talk I will present an overview the results of the STAR experiment at RHIC at BNL.
Heavy flavor and quarkonia production at RHIC
In this work, we study the magnetization dynamics of an anisotropic particle subjected to a time dependent magnetic field. We use the dissipative Landau–Lifshitz–Gilbert equation to model the magnetization dynamics. To perform the characterization, we compute the Lyapunov exponents and the isospikes diagrams in two-dimensional phase diagrams of the parameter space of the particle. We observe...
The CMS experiment have collected 130 $fb^{-1} $ of proton-proton collision events at 13 $TeV$. New tools and significant improvements in reconstruction algorithms, triggering, and calibration have been developed for the ultimate processing of the Run2 dataset. In this presentation, an overview of the performance of the reconstruction and identification of the physics quantities will be described.
Highlights talk: Recent CMS B physics results
The CMS experiment uses a two-level triggering system consisting of the Level-1, instrumented by custom-design hardware boards and delivering an output rate of 100 kHz, and the High Level Trigger, a streamlined version of the offline reconstruction software running on a computer farm, which sends a rate of about 1 kHz to permanent storage. This system has been evolving continuously since the...
The Belle II experiment at the SuperKEKB energy-asymmetric $e^+ e^-$ collider is a substantial upgrade of the B factory facility at the Japanese KEK laboratory. The design luminosity of the machine is $8\times 10^{35}$ cm$^{-2}$s$^{-1}$ and the Belle II experiment aims to record 50 ab$^{-1}$ of data, a factor of 50 more than its predecessor. With this data set, Belle II will be able to measure...
