The Relativistic Heavy Ion Collider (RHIC), located at Brookhaven National Laboratory, is celebrating its 25th year of operation, making a significant contribution in nuclear physics research.
Over the past 25 years, RHIC has been instrumental in studying fundamental aspects of matter by colliding a variety of atomic nuclei, from protons to uranium, at different energies from 3 to 200 GeV,...
We show that a very clear signal of the presence of a strong magnetic field during the early stage of a high-energy heavy-ion collision is provided by the decay of the $Z^0$ into dimuon pairs. We find that the process is highly anisotropic, producing pairs mainly out of plane, as signaled by a negative value of $v_2$, and leads to an antimuon transverse momentum distribution which peaks at a...
Various approaches to the quadratic divergence of the Brout-Englert-Higgs boson mass are briefly reviewed. The corresponding criteria of naturalness are discussed. The boundaries of naturalness domain of the Standard Model are estimated.
According to the modern physics, our Universe is baryo-asymmetric. That phenomenon
can not be described in the frameworks of the Standard Model of particle physics. Globally, the Uni-
verse consists of baryon matter. However, some scenarios can lead to the existence of local antimatter
domains.
In the research chemical evolution of such domain is studied.
The size of the domain...
Top quark pair production in association with a Z boson (ttZ) is a rare process within the Standard Model (SM) that provides a stringent test of SM predictions and sensitivity to potential new physics. We present measurements of ttZ production with the CMS detector, using the full Run 2 dataset of proton–proton collisions at a center-of-mass energy of 13 TeV. Due to detector acceptance effects...
Different variants of dark sector models and portals between dark and visible sectors that can be tested at LHC will be considered in the talk. Both prompt and LLP signatures can be used in such searches, and the corresponding constraints obtained by the ATLAS and CMS collaborations will be briefly discussed.
A review is given of dimuon physics in the CMS experiment at the Large Hadron Collider (LHC), starting from studies of dimuons in the Standard model physics including Z bosons, measurements of Drell-Yan process and rare decays, and finalizing by the searches of new physics beyond the Standard model.
The main characteristics of the Circular Electron-Positron Collider (CEPC) in China, which will become a factory of Z, W, H bosons and top quarks, are described. The concepts of experimental facilities for precision research of the physics of the Standard Model and beyond are presented. The main physical tasks are considered. The participation of the JINR in experiments at the CEPC is discussed.
In this talk, I will present our study on the rotational Brownian motion of heavy quarks in a QCD medium and its implications for the polarization of open heavy-flavor hadrons. Our results suggest that the transverse momentum dependence of heavy-quark polarization offers a distinctive probe of the intense magnetic fields created in off-central relativistic heavy-ion collisions. I will also...
The SPD (Spin Physics Detector) facility is currently under construction at the NICA accelerator complex at JINR. In addition to the physical installation itself, software is also being developed. There is already a constant need to obtain sufficiently large amounts of data to simulate physical processes in a future experiment. To facilitate their implementation, a set of systems and services...
The measurement of the gluon-jet fraction in a jet sample relies on various jet parameters and is inherently model dependent. Jet properties are defined within a hadronization model embedded in the Monte Carlo generator. The talk presents a method for quantitatively determining how far the hadronization model deviates from the unknown true hadronization picture. A data-driven correction...
The report reviews the results obtained using Monte-Carlo generators as part of the CMS group's analysis of the search for new physics in the muon pair channel. Both signal and background processes were simulated.
In particular, the Drell-Yan processes and the Photon-Induced Background contributing to the signal at large invariant masses of the order of several TeV are considered.
We developed a new spectral function approach for calculation of parton distribution in hadrons for the valence quark region. The approach explicitly introduces the light-front wave function of the residual state allowing to construct the light-front spectral function of the hadron in which case valence quarks are massless embedded in the mean field of the residual state.
Within this...
The search for gravity arising from large extra dimensions at collider energies is explored in the transplanckian regime, where the center-of-mass energy, $\sqrt{s}$, is much greater than both exchanged momentum, $Q$, and the extra dimension Planck mass scale $M_D$. The primary signature of large extra dimension gravity in the transplanckian regime is the production of high-mass dijet events...
Recent LHC results of proton-lead collisions with large forward rapidity gaps show a dominant role of photon exchange over pomeron one. A comparison of proton-lead and proton-proton events with forward rapidity gaps at LHC energy allows to estimate pomeron- and photon- exchange contribution dependences on atomic number and electric charge, respectively.
A unified framework for describing the production of both baryons and exotic multiquark states at large transverse momentum is presented. The core of the approach is a scalar diquark proton model augmented by parton intrinsic transverse momentum. We show that this model successfully accounts for the observed strong scaling violation in inclusive proton production across a wide energy range,...
This presentation covers the latest results on Higgs physics from the CMS experiment.
Flavor-changing neutral currents (FCNCs) involving the top quark are highly suppressed in the Standard Model, making them powerful probes for new physics. This talk presents results from CMS searches for FCNC interactions between the top quark and the Higgs boson, photon, and Z boson, based on proton-proton collision data at \sqrt{s} = 13\;\mathrm{TeV}. The analyses target final states with...
The search for glueballs – colorless bound states of gluons – is one of the most important tasks within the modern QCD. While parameters of glueballs are predicted under a wide range of models, their experimental observation is extremely difficult due to the mixing with the conventional mesons. Glueballs are predicted to be abundantly produced in glue-rich processes, such as charmonia decays....
Searches for new physics phenomena constitute essential part of the research programme at the Large Hadron Collider (LHC). Using about 140/fb of proton-proton collision data collected at a centre-of-mass energy of 13 TeV during LHC Run 2, the CMS Collaboration has performed searches for additional scalar ($\mathrm{H}$) and pseudoscalar ($\mathrm{A}$) bosons predicted by theories beyond the...
The Spin Physics Detector (SPD) collaboration is preparing a universal detector for installation at the second interaction point of the Nuclotron-based Ion Collider fAcility (NICA). As the facility progresses and the physics research program evolves, the demands for advanced data processing capabilities increase. To meet these requirements, the SPD Software & Computing (S&C) project has been...
