The aim of the BM@N experiment is the study of collisions of elementary particles and ions with a fixed target at energies up to 4 GeV per nucleon. The experimental facility is one of the main elements of the first stage of the NICA collider development and will be used to study hot and dense matter in heavy ion collisions. It is well known that a transition from hadronic matter to Quark-Gluon...
The QCD phase diagram was explored in certain regions of the parameter space by different experiments and a critical end point in this diagram is a theory-based prediction. In the Nuclotron-based Ion Collider fAcility (NICA) the Multipurpose Detector (MPD) is currently under construction intending to confirm this prediction. Motivated by the low trigger efficiency in low multiplicity p+p...
To simulate the forward hadron calorimeter (FHCal) response, in the future MPD/NICA experiment two Monte Carlo generators DCM-SMM and PHQMD with two variants of cluster detection (MST and SACA) for the last one are used. Monte Carlo simulations are crucial in developing methods for centrality and orientation of the reaction plane determination with FHCal. We present an experimental...
Baryonic Matter at Nuclotron (BM@N) is the first experiment at the NICA accelerator complex. The aim of the BM@N experiment is to study interactions of relativistic heavy ion beams with fixed targets. Detectors based on Gas Electron Multipliers (GEM) are used of the central tracking system, which is located inside the BM@N analyzing magnet. The next BM@N physics run is planned at the end of...
The dependencies of the average kinematical characteristics of the negative and positive pions, produced in 12C+12C collisions at 4.2 A GeV/c, on the collision centrality have been investigated. The number of the produced negative pions per participant nucleon of a projectile 12C nucleus, the average inelasticity coefficients of π−mesons, and the shapes of their full and transverse momentum...
BM@N (Baryonic Matter at Nuclotron) is the first fixed target experiment at NICA Facility at JINR (Dubna, Russia). It is designed to study nuclear-nuclear collisions at high densities. The research program in Run-7 was devoted to studies of cross section of inelastic reactions Ar + A → X with the beam kinetic energy from 2.3 to 3.5 GeV and different targets: C,Al,Cu,Pb,Sn.
The report...
A central goal of current relativistic heavy-ion experiments is to study the properties of the hot and dense QCD matter. Such studies provide better insight in the QCD phase diagram, as well as the transport coefficients of the strongly-coupled Quark Gluon Plasma (sQGP). Anisotropic flow measurements of identified particles play an essential role in such studies.
We report on the results of...
The accelerator complex NICA is builting at JINR (Dubna).
Two interaction points are foreseen at NICA for two detectors which will operate simultaneously. One of these detectors, the Multi-Purpose Detector (MPD), is optimized for investigations of heavy-ion collisions. The Time-Projection Chamber (TPC) is the main tracking detector of the MPD central barrel. It is a well-known detector for...
The paper presents the performance studies of the scintillation detector prototype with SiPM readout using different types of the front-end electronics (FEE).
The timing and amplitude resolutions with LED have been obtained. These results can be applied for the proton and deuteron beams polarimetry at the Internal Target Station at Nuclotron.
Жидко-Водородные мишени являются неотъемлемой частью большинства экспериментов физики высоких энергий. Конструкции данных мишеней сочетают в себе массу уникальных технических решений в ответ на специфические требования, выдвигаемые условиями физических экспериментов и безопасностью работы с водородом. В статье изложен опыт создания первой жидко-водородной мишени с криорефрижераторным...
Different kinds of gaseous detectors are widely used in present and future experiments. Straw Tube Trackers (STT) and Micro-Pattern Gaseous Detectors (MPGD) are capable for both precise hit charge and coordinate measurements. Flexibility of their operation makes them to be an attractive solution for detector instrumentation in future High Energy and Neutrino Physics experiments.
High quality...
The Baryonic Matter at Nuclotron experiment (BM@N) aims to study the area of QCD phase diagram at high net baryon densities and moderate temperatures with collisions of heavy ions at $\sqrt{s_{NN}}$ = 2.3–3.5 GeV. Anisotropic transverse flow is one of the most important observable phenomena in a study of the properties of matter created in such collisions. Flow measurements require the...
The staves of the MPD-ITS detector will be composed by large arrays of Monolithic Active Pixel Sensors (MAPS) forming the cylindrical layers of the Inner Tracking System of the MPD experiment at NICA. These MAPS will be attached to a cooling plate for the power dissipation. Ultra-lightweight cooling concepts were put forward as a technical solution offering a good compromise among all...
The NA64 experiment is a fixed-target experiment at the CERN SPS combining the active beam dump and missing energy techniques to search for rare events. The experiment looks for new particles such as dark photons, axion-like particles, new light X or Z’ bosons by colliding 100-150 GeV energy electron or muon beams onto an active target.
The report presents the muon part of the experiment. The...
Взаимодействие бозона Хиггса с топ-кварком, как наиболее тяжелых
частиц стандартной модели, представляет интерес с точки зрения поиска новой
физики за рамками стандартной модели. Это взаимодействие определяется
постоянной взаимодействия Юкавы. Ее комплексная
фаза до сих пор остается неизвестной, но может быть определена при
исследовании канала рождения бозона Хиггса совместно с одиночным...
A search for dark matter particles is performed using events with a Z boson candidate and large missing transverse momentum. The analysis is based on proton-proton collision data at a center-of-mass energy of 13 TeV, collected by the CMS experiment at the LHC in 2016-2018, corresponding to an integrated luminosity of 137 fb$^{−1}$. The search uses the decay channels Z$\rightarrow$ee and...
A method for measuring the gluon fraction in a jet sample based on a quark-gluon likelihood discriminator was proposed in report. Measuring the gluon fraction opens the way to measuring the characteristics of quark and gluon jets. The report presents the results of measurements of gluon fraction in channel of inclusive jets selected by the CMS detector in 2016 at energy of 13 TeV with an...
This paper describes the implementation of a neural network for the problem of classifying the Higgs boson production signal in association with a single top quark (pp to Ht) and the main background processes (tt, ttH, ttW, ttZ). The tH channel is sensitive to the sign of the coupling, unlike ttH. Also, an accurate Higgs-top cross-section will allow setting the limits of the coupling constant...
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\textbf{RADIATION CORRECTIONS TO PROMPT PHOTON PRODUCTION IN
COMPTON SCATTERING OF QUARK-GLUON }$qg\to q\gamma $ \textbf{AND ANNIHILATION OF
QUARK-ANTIQUARK PAIR }$q\bar{q}\to g\gamma $\textbf{PROCESSES }
\textbf{}
\textbf{M.R....
As confirmed by theory and measurements, one, two or three neutrons are emitted frequently in ultraperipheral collisions (UPC) of heavy relativistic nuclei, in particular, $^{208}$Pb. The exchange of soft equivalent Weizs\"{a}cker--Williams photons dominates in such interactions. This leads to the excitation and decay of Giant Dipole Resonances (GDR) in colliding nuclei typically below the...
The Spin Physics Detector, one of the two facilities of the future NICA collider at the Joint Institute for Nuclear Research, is for studying the nucleon spin structure and spin-related phenomena with polarized proton and deuteron beams. Understanding how dynamics of the quarks and gluons determine the structure and the fundamental properties of the nucleon is one of the interesting unsolved...
Currently, positron emission tomography (PET) is one of the most effective tools for medical diagnostics. The basic principle of PET is the detection of gamma pairs with an energy of 511 keV generated by the annihilation of a positron with an electron in organic tissue. According to the theory, annihilation photons have mutually perpendicular linear polarizations, and their quantum states are...
Vector analyzing power in quasielastic proton-proton scattering was obtained
at the Nuclotron Internal Target Station using a polarized deuteron beam and
a polyethylene target. The selection of useful events was performed using the
time and amplitude information from scintillation counters. The asymmetry on
hydrogen was obtained by the subtraction of the carbon background. The
values of...
The barrel detector (BD) is used for selection of AA-collisions on centrality. For this purpose, a threshold on a number of fired channels of both detectors is set in the fast interaction trigger in the T0U module.The scintillation light produced by charged particles is detected on a single end of a strip by SiPM Micro FC-60035-SMT from Sensl which is directly connected with the strips.
The...
The electron beam produced by the cathode node in the Electron String Ion Sources (ESIS) is the basis of ionization process.
The new cathode node contains several interesting electronic modules which are designed by the JINR NICA accelerator division engineers.
The topic describes the Electron String Ion Sources (ESIS) cathode node electronics development, production and operation process.
Particle Identification (PID) analysis for the Multi-Purpose Detector (MPD) with TPC signals. Data is generated by implementing the MPDROOT software of the NICA experiment. Transporting and track reconstruction for Bi-Bi collisions at center-of-mass energy of 11 GeV is simulated. The PID is computed using a statistical technique (Bayesian Method) for Bethe-Block signal and machine learning...
For clarifying the validity of the Lepton Universality hypothesis, the interaction cross section for all three flavors of leptons have to be known with high precision. In neutrino sector, for electron and muon neutrinos, the interaction cross section is known fairly well, but for tau neutrino only poor estimations exist. In particular, the most direct measurement by the DONuT experiment was...
Long-baseline accelerator neutrino experiments are researching a phenomenon of neutrino oscillations. They are studying unknown mixing parameters such as $\delta_{CP}$ (the charge-parity phase), $\Delta m^2_{32}$ (the neutrino mass ordering) and the octant of mixing angle $\theta_{23}$ using samples of muon neutrino disappearance and electron neutrino appearance.
At the moment the...
High energy cosmic ray muons have highly penetration capability which allows them to cross kilometers of rocks. Due to the reasonable rate of cosmic muons at the Earth’s surface and their high penetration capability they are of great use in fields beyond the particle physics, such as geology, archaeology, speleology and industrial construction.
The above mentioned features of cosmic...
The main goal of the Baikal-GVD project is to detect high-energy astrophysical neutrinos. In particular, the telescope's aim is to register the Cherenkov radiation emitted during the passage of secondary charged particles formed as a result of neutrino reactions with the environment through the deep waters of Lake Baikal. In addition to Cherenkov radiation, ambient background noise and...
The search for neutrinoless double $\beta$-decay, in particular double K-capture, is of great importance. Confirmation of its existence would mean that the neutrino is Majorana particle. The investigation of this process provides one of the best opportunities to study physics beyond the Standard Model. The double electron capture process 2EC2$\nu$ was experimentally discovered only once in the...
The experimental observations from the colliders established the standard model (SM), is the most
successful phenomenological framework to explain the non-gravitational interactions of fundamental
particles at high energy. Non-zero neutrino mass and dark matter cast a shadow over its success.
This necessitates the extension of the SM. The most straightforward and elegant extension of the...
PMTs are widely used in different areas of physics, especially in neutrino experiments that use great amount of PMTs, both large and small, in order to determine the neutrino hierarchy and oscillation parameters through achieving excellent energy resolution. PMTs do collect the photo-signal from the detector and convert it into the electric signal. The quality of such convertation depends on...
NA64 is a fixed-target experiment located at the H4 beam line of the Super Proton Synchrotron (SPS) at CERN. It is dedicated for searches for dark matter production in both visible and invisible decays of sub-GeV vector mediators.
The experiment facility includes different types of detectors: Calorimeters, Straws drift tubes, Gas Electron Multipliers (GEM), Micromegas, Beam Momentum...
Nowadays one of the urgent tasks of high energy physics is search and study of multiquark XYZ states. Calculations obtained using Lattice QCD cannot fully describe spectrum of that states and predict parameters currently unopened states. Helicity amplutude formalism is one of the main instruments which are used in the process of amplitude analysis to measure the parameters of these states such...
Studies of light propagation in random media are of great importance in many areas of physics, such as, for example, astrophysics, biophotonics, particle physics, applied researches. Understanding and optimization of particles detector’s response usually requires extensive simulations of photons transportation, often performed with Monte-Carlo techniques. Powerful Monte-Carlo
methods,...
We investigate the thermal dilepton and photon production yields from relativistic heavy ion collisions in presence of both shear and bulk viscosities by employing the recently developed second order viscous hydrodynamic framework within a quasiparticle description of hot QCD medium. The sensitivity of shear and bulk viscous pressures to the temperature dependence of relaxation time is studied...
As quantum chromodynamics (QCD) does not work in non-perturbative regime that dominates in hadron collisions, one could use the approach of quark–gluon (color) string model to quantitatively describe soft processes of multi-particle production. For instance, study the mechanism of string fragmentation and particles sources interaction by looking at different correlations between produced...
The commissioning of an all-around Construction Management information System (CMIS) was recently completed as a joint effort of two JINR Laboratories (LHEP and LIT). The system is particularly useful for the fine-grained control and continuous feedback of the production of complex multipart objects like the detectors subsys- tems composing the MPD and BM@N experiments of the NICA facility at...
The background induced by misidentification of a jet as a photon is usually estimated using two-dimensional sideband method (ABCD-method). This report is devoted to an alternative approach to the estimation based on maximum likelihood method which doesn't require the optimization of ABCD regions boundaries, which results in much faster estimation. This method has not been applied to the...
