The NA65 (DsTau) experiment uses a direct way to study the tau neutrino production from Ds decay, produced in high-energy proton-nuclear interactions. For registering such short lived particles, nuclear emulsion tracking detectors are used, capable of distinguishing events, despite of a high density of $10^5-10^6$ particles/cm$^2$.
The present report shows the first results of the pilot...
The main objective of the Baikal-GVD neutrino telescope is to detect high-energy neutrinos from astrophysical sources, thus contributing to the advancement of modern understanding of the high-energy universe. In the present work, we estimate the total neutrino detection rate from several possible particle sources, including TXS 0506+056, NGC 1068, and the Galactic Center, assuming a hadronic...
The NOvA experiment, aimed at studying the neutrino oscillations in the muon neutrino beam, uses two segmented liquid scintillation detectors, with masses of 300 tons and 14 kilotons, respectively.
The large size and high segmentation of the NOvA detectors, as well as a flexible system of software triggers and data acquisition, make it possible to solve additional physical problems, in...
DUNE is a long-baseline experiment for neutrino oscillation studies. Its near detector complex consists of three main parts. One of them is ND-LAr, the liquid argon time projection chamber (LAr-TPC). In this type of detectors, a light collecting system (LCS) is commonly used as a trigger system. In this work the ND-LAr LCS is considered. It consists of two different types of photodetectors:...
Modern astronomy aims to study the astrophysical objects with the various types of signals such as photons, neutrinos, cosmic rays and gravitational waves. To achieve the goals of the multi-messenger astronomy, experiments should exchange their data, which can be done with the alert messages.
Alert contains essential information about the detected event: sky coordinates, date, time of the...
This study investigates effects of lepton flavor violation (LFV) in proton-proton collisions at $\sqrt{s}=13$ TeV with $e\mu$ and $\mu\tau$ final states. Using an effective Lagrangian which characterizes the 4-fermionic contact interaction, a Monte Carlo simulation of the process was performed. As a result, two-dimensional distributions by the invariant mass $m_{inv}$ and azimuth angle...
BM@N (Baryonic Matter at Nuclotron) is the first experiment operating taking data at the accelerator complex of NICA-Nuclotron. The BM@N physics program is based on studies of highly compressed nuclear matter in heavy ion beams. The Nuclotron provides heavy ion beams with energies from 2.3 to 4.5 AGeV, which is suitable for studies of strange mesons and multi–strange hyperons produced in...
Baryonic Matter at Nuclotron (BM@N) is the fixed target experiment at the NICA accelerator complex. Detectors based on Gas Electron Multipliers (GEM) are used at the central tracking system, which is located inside the BM@N analyzing magnet. Central tracking system consists 14 GEM-detectors, with two different sizes of active area (163×45 cm2 and 163×39 cm2), combined in the 7 detector planes....
In the relativistic heavy ion collisions at the beam energy of a few GeV the strongly interacting matter is created at high baryon densities and relatively low temperatures. Azimuthal anisotropy of the produced particles provides a valuable insight into the properties of this form of matter. In this work we discuss the layout of the upgraded Baryonic Matter at Nuclotron (BM@N) experiment and...
One of the non-trivial problems in high energy hadronic interactions is the treatment of the process of the production of the final state hadrons from quarks, antiquarks and gluons of the parton shower. Many models of hadronization were developed and tuned to electron-positron collider data. However, data from recent both collider and cosmic ray experiments in high energy physics show the...
A custom Application Specific Integrated Circuit (ASIC) TIGER (Turin Integrated Gem Electronics for Readout) is capable of simultaneous precise measurements of both the charge and time characteristics of signals in gaseous detectors. Flexibility of TIGER operation parameters makes it attractive to be evaluated as a front-end electronics solution for Straw-based Trackers of future High Energy...
Search and study of multiquark XYZ states is one of the urgent tasks of modern high energy physics. Calculations obtained using Lattice QCD cannot fully describe spectrum of that states and predict parameters currently unopened states. Studying the properties of exotic hadrons can bring us to a better understanding of the strong interaction. In this report, results of the amplitude analysis of...
The NA64 experiment at the CERN SPS is designed primarily to search for dark photons in events with missing energy. Some other similar processes that have the missing energy signature can also be searched for the Lepton flavor violation (LFV), for example $e \rightarrow \tau$, $e \rightarrow \mu$, $\mu \rightarrow \tau$ and $\mu \rightarrow e$ conversions. The NA64 is capable for search lepton...
When analyzing the rare Higgs-top channel, there is a problem of isolating this channel from the background. The separation problem can be solved using machine learning. A neural network is one of the most modern methods of Machine Learning. But the result of such an analysis highly depends on the set of input kinematic variables, the network architecture and other network hyperparameters....
We study Z-boson production at the LHC energies within framework of the parton Reggeization approach of high-energy QCD [1,2]. Oppositely the previous calculation [3], based on LO approximation with the partonic process Q + Q¯ → Z, we take into account NLO contribution from the partonic process Q + R → q + Z, where R is the Reggeized gluon and Q is the Reggeized quark. The good agreement with...
The $\Sigma^{0}$ hyperon is reconstructed via its electromagnetic decay into $\Lambda + \gamma$ due to the unique ability of ALICE to register low-energy photons.
Different methods of background subtraction for the measurement of the yield of $\Sigma^{0}$ hyperon invariant are investigated. It is done by
the approximation of the background shape by the
polynomial function and the...
The invariant cross sections of $\pi^0$ and $\eta$ mesons provide strong constrains to the nuclear structure of the colliding particles, while the spectra of direct photons in heavy-ion collisions carry undistorted information about the thermodynamic evolution of the quark-gluon plasma (QGP). In addition, Hanbury Brown and Twiss (HBT) correlation of direct photons can shed light on the...
The decay of the charged kaon K+→π+π-π+γ is currently rather poorly studied. A research (Shapkin et. al, 2019) confirmed the correspondence of the differential branching values with the calculated values based on the chiral perturbation theory, but only for photons with an energy of at least 30 MeV. Currently, the measured value of the branching of this decay is (1.04±0.31)*10^-4 under the...
A large-scale tracking detector TREK has been constructed at the National Research Nuclear University MEPhI. This detector has been developed for the purpose of investigating cosmic ray muon bundles at large zenith angles. Covering an area of 250 square meters, the detector consists of two planes of multi-wire drift chambers. The main features of this detector is the vertical deployment of...
The K^{+} → π^{0}µ^{+}νγ (K_{µ3γ}) and K^{+}→π^{0}e^{+}νγ (K_{e3γ}) decays are measured with OKA detector at the RF-separated 17.7 GeV/c momentum kaon beam from the U-70 synchrotron. The data obtained corresponds to the value of 2.62 × 10^{10} «live» kaons passing to the decay volume. About 10^{3} K_{µ3γ} and 10^{5} K_{e3γ} events are extracted. The ratios of R_{µ} = Br(K_{µ3γ})/Br(K_{µ3}) and...
Analyses performed on data from high energy experiments aim to describe the nature of processes ruling high energy collisions and compare the results with theoretical predictions. To ensure reproducibility of results and reliable comparisons between different experiments, a common representation is needed where the real values of observables are determined with the least possible uncertainty....
Centrality determination is an important task because it allows estimating the collision system size in relativistic heavy-ion collisions. With the help of centrality, it is also possible to compare the results of upcoming measurements with the Multi-Purpose Detector (MPD) at NICA with data from other experiments and calculations of theoretical models. In this work is proposed a new approach...
The space-time picture of hadron formation in high-energy collisions with nuclear targets is still poorly known. The tests of hadron formation was suggested for the first stage of SPD running. They will require measuring charged pion and proton spectra with the precision better than $10\%$. A research has been carried out to check feasibility of such studies at SPD. In this work,...
The direct photon production in proton-proton collisions, both inclusive and heavy-meson-associated, is an important source of information on gluon distribution function inside the proton. Through the studies of transverse single-spin and double longitudinal asymmetries in polarized-beam collisions one can extract the information of the spin gluon content [1,2]. Since the study of direct...
The size and evolution of the matter created in a relativistic heavy-ion collision strongly depend on the collision's initial geometry, defined by centrality. Experimentally the centrality of collisions can be characterized by the measured multiplicities of the produced particles at midrapidity or by the energy measured in the forward rapidity region, which is sensitive to the spectator...
This study focuses on the reconstruction of neutrino direction in the Baikal-GVD experiment using convolutional neural networks and graph neural networks. Monte Carlo simulation data is utilized, examining single-cluster events of atmospheric neutrino with energies ranging from 10 GeV to 100 TeV. The performance of proposed models are compared to a standard reconstruction algorithm comparing...
