I.B. Smirnov

  (HEPD PNPI)

Reconstruction of spatial resolution of multilayer detectors.
  Abstract:
Mathematical methods for reconstructing the spatial resolution of multilayer position-sensitive detectors designed to register fast charged particles are considered. The method presented in this report uses track fitting with arbitrary weights of hits and reconstructing spacial resolutions from the observed variances and covariances of residuals. As shown earlier, individual layer resolutions can be reconstructed by this method from the observed variances of residuals, even if the layer resolutions differ, for detectors consisting of five or more layers. In this talk, it will be shown that individual layer resolutions of 4-layer detectors cannot be obtained by this method from any combination of equations for the variances and covariances of the residuals. But many useful characteristics can be obtained, such as different average resolutions of two or four layers.

V.G. Riabov

  (HEPD PNPI)

Status and perspectives of the MPD-NICA detector program.
  (Presentation)
  Video
  Abstract:
The Multi-Purpose Detector (MPD) is the main experimental detector of the NICA complex under construction at JINR. With collisions of heavy-ions in the energy range $\sqrt{s_{NN}}=4-11$ GeV, MPD will scan the region of high net baryon density of the QCD phase diagram to look for the critical end point and study the first order phase transition thought to occur in that region. The commissioning of the MPD and first data taking is foreseen to start in years 2025-2026. The MPD comprises a rich physics program that includes the study of hadron spectra and hyper-nuclei production, correlations and fluctuations, hyperon global polarization, electromagnetic probes, open charm production, among other observables. In this talk, we present the status of the project, its competitiveness and its physics measurements feasibility with the first beams.

A.P.Kaschuk

  (OPR PNPI)

Coordinate detectors of ionizing particles and radiation (IchI) - the concept of import substitution.

A.Ye. Shevel

  (HEPD PNPI)

HEPiX Spring 2025 International Workshop Overview.
  (Presentation)
  Video
  Abstract:
An overview of reports and messages from HEPiX Spring 2025 is anticipated. The HEPiX conference series addresses practical issues related to organizing experimental data processing in high-energy and nuclear physics. Topics discussed at the conference encompass software architecture trends, storage growth, Linux distributions, hardware upgrades, and mid-term hardware expectations. Special attention will be paid to the growing role of machine learning technology in ensuring the reliability of large-scale computer infrastructure.

I.G. Alekseev

  (ITEP, Moscow)

Search for light sterile neutrinos.
  Video

S.S. Afonin

  (SPbSU & NRC "Kurchatov institute" - PNPI)

Unexpected Manifestation of Confinement: Hydrogen-Like Symmetry in the Spectra of Light Mesons.
  (Presentation)
  Video
  Abstract:
The confinement of quarks and gluons is considered to be the main unsolved problem in the physics of strong interactions. One of the striking manifestations of confinement is the observation of approximately linear Regge trajectories in the spectra of light hadrons. About twenty years ago, the author noticed and substantiated the existence of an approximate symmetry in these trajectories in the case of mesons without hidden strangeness. Moreover, the symmetry has the same form as in the energy levels of the hydrogen atom, where it arises due to the Coulomb degeneracy. This topic will be covered in the talk, including a discussion of the status of this symmetry in the view of the data obtained over the past twenty years. In particular, this symmetry allowed us to predict the a0(1710) resonance, recently discovered experimentally. A qualitative explanation of the emerging symmetry will also be given based on the hadron string model in the semiclassical approximation.

S.V. Ivanov

  (IHEP, Serpukhov)

Acceleration Facility U-70: structure, possibilities, and development projects.
  (Presentation)

А.М. Коstrygina, I.A. Mitropolsky

  (SPbSU, NRD PNPI)

SYSTEMATICS AND STRUCTURE OF ISOMERIC STATES OF SPHERICAL NUCLEI.
  (Presentation)
  Video
  Abstract:
Based on the database of properties of nuclear states with a known lifetime, the isomeric states of nuclei are systematized. The main attention is paid to the "spin" isomers in spherical nuclei associated with the 1g9/2 orbital. The lifetimes of isomeric states of A-odd nuclei in a single-particle model are described. The structure of isomeric states of neighboring double-odd nuclei is discussed.

V.T. Kim

  (HEPD PNP NRC KI)

Brout-Englert-Higgs boson and naturalness domain of the standard model.
  Abstract:
The problem of naturalness and mass hierarchy for the standard model is discussed in connection with the quadratic divergence of the Brout-Englert Higgs boson mass in physical renormalization schemes. Estimates of naturalness domain of the standard model are given within the framework of various approaches to the presence of such divergences.

V.A. Petrov

  (IHEP, Serpukhov)

On radii of hadrons.
  (Presentation)
  Video

A.N. Fazliakhmetov

  (INR RAS, Moscow)

Study of neutrino interaction with nuclei 71Ga, 76Ge, 127I, 128,130Te.
  (Presentation)
  Video
  Abstract:
Calculations of cross-sections and capture rates of neutrinos with energies <20 MeV (from the Sun) by nuclei 71Ga, 76Ge, 127I, 128,130Te are discussed. The interest in these isotopes is related to the possibility of their use as targets in detectors of existing and planned international neutrino experiments aimed at searching for the process of double neutrinoless beta decay (SNO+ experiment — 128,130Te isotopes, LEGEND — 76Ge isotope), dark matter, sterile neutrinos (BEST experiment — 76Ge isotope), registration of coherent neutrino scattering (COHERENT experiment — 127I isotope), etc. The interaction of neutrinos from the Sun with the nuclei of the detector target can imitate the target signal of the experiment. Detection of neutrinos from the Sun is one of the goals of the Baksan Large Neutrino Telescope (BLNT) project.
   For the nuclei under consideration, the calculations of the neutrino capture cross sections and rates were performed taking into account both discrete parts of the nuclear excitation spectrum based on the latest measurement data in charge-exchange reactions, and the calculations made for the first time, taking into account the contribution from nuclear resonances obtained from processing the experimental data on charge-exchange reactions. A comparison was made with calculations based on the microscopic theory of the nucleus. It was shown that for 76Ge, 127I, 128,130Te, taking into account the resonance structure significantly (up to 2 times for 128Te) increases the final rate of solar neutrino capture. For the BLNT, the number of events from solar neutrino capture was estimated when adding 128,130Te isotopes to the detector target. (based on the PhD thesis).

S.V. Chenmaryov

  (HEPD PNPI)

Mass measurments of the transuranium nuclides in the vicinity of the neutron number N=152 on the TRIGA-TRAP trap setup.
  (Presentation)
  Video
  Abstract:
The current state of the TRIGA-TRAP ion trap system and the current results obtained on it are presented. The TRIGA-Mainz reactor and the TRIGA-Spec coupling system are described. A brief description of the operating principles of Penning traps and methods for determining the ion eigenmotions frequencies in the trap are given. An overview of the new design of the TRIGA-TRAP trap is given, as well as an examination of its systematic error in determining the masses. An overview of the current results of measuring masses of the transuranium nuclides in the vicinity of the neutron number N=152 on the TRIGA-TRAP trap is given.

A.P. Serebrov

  (PNPI NRC KI)

Left-right model of weak interaction with CP-violation, CP-violation in baryons and K-mesons, baryon and lepton asymmetry of the Universe.
  (Presentation)
  Video
  Abstract:
In connection with the analysis of the experimental situation with neutron decay, the left-right model of weak interaction is continued considering CP-violation. CP-violation in baryons is found at the 2 sigma level. It is shown that it is possible to describe the effects of CP-violation in decays of neutral K-mesons using the parameters of the left-right model, which are extracted from neutron decay. Thus, the left-right model of weak interaction, extended by CP violation, allows, within the limits of the available accuracy, to describe the effects of CP violation in baryons and mesons. Different signs of baryon and lepton CP-violating asymmetry are associated with different signs of baryon and lepton asymmetry of the Universe. B-L is conserved.

E.A. Doroshkevich

  (INR, RAS)

Predictions, searches, and observation of dibaryon resonanses.
  (Presentation)
  Video

A.G. Olshevskiy

  (JINR, Dubna)

Study of Neutrino Oscillations in Accelerator and Reactor Experiments: Results and Prospects.
  Video
  Abstract:
Review on the study of neutrino oscillations at accelerators and reactors: results, current state and prospects. Discussion of the accuracy of the determination of oscillation parameters and the main ingredients that determine this accuracy. Prospects for current and near-future projects, as well as plans and opportunities related to the global interpretation of the world's neutrino oscillation data.

A.N. Ilyichev

  (INP BSU, Minsk)

Electromagnetic radiation effects in lepton-proton scattering.
  Video
  Abstract:
Since leptons have spin and they are point-like particles, their scattering off a proton is the most direct and accurate source of information about the internal structure and spin properties of the proton. The main goal of such scattering consists in the study of the one-photon exchange contribution, which leads to the necessity for the theoretical calculation of higher-order effects within a certain model and the removal of these effects from experimental data. Often, such a procedure is performed at the level of event simulations with the emission of a hard undetectable photon, which allows taking into account the features of the experimental setup. In this talk, some methods of calculation are presented, and Monte Carlo simulations of electromagnetic radiation effects in the lepton-proton interaction are described for the following channels:
- elastic (lp → lp[γ]),
- semi-inclusive (lp → lhX[γ]),
- exclusive photon electroproduction (ep → epγ[γ]).

Yu. Dokshitzer

  (PNPI NRC KI)

«Multipartice production in QCD, high-multiplicity trigger and CMS ellipticity».

A.S. Barabash

  (NRC KI)

Neutrino mass: direct measurements and double beta-decay.
  (Presentation)
  Video

L. David Roper (Prof. Emeritus of Physics, Virginia Polytechnic Institute and State University) and Igor Strakovsky (GWU)

Baryon and Meson Excited States.
  (Presentation)
  Video
  Abstract:
The masses of seventeen baryon sets and twenty-four meson sets of three or more equal-quantum excited states are fitted by a simple two-parameter logarithm function, Mn = a Ln(n) + b, where n is the level of radial excitation. The conjecture is made that accurately measured masses of all equal-quantum baryons (including LHCb exotic Pc-bar-c) and meson excited states (including s-bar-s, s-bar-c, c-bar-c, c-bar-b, and b-bar-b states) are related by the logarithm function used here, at least for the mass range of currently known excited states. Thus, a universal mass equation for equal-quantum excited-state sets is presented.

G.E. Gavrilov

  (HEPD PNPI)

The nature of spontaneous self-sustained current sources in multiwire proportional chambers of LHC experiments.
  (Presentation)
  Video
  Abstract:
Over a long period of operation, large current spikes have repeatedly occurred in many multiwire proportional chambers (MWPCs) at the LHC, causing the emergency shutdown of the high-voltage power supply. In most cases, the behavior of the current is typically characterized by a spontaneous nature and point localization, which is comparable to the Malter effect. Numerous life tests of laboratory and full-scale MWPC samples of the CMS and LHCb experiments have shown that even the accumulated charge on anode wires equivalent in magnitude to 30-50 years of operation in the experiment does not lead to the failure of the detectors or the emergence of spontaneous self-sustaining currents. It became obvious that the nature of sources of such currents is associated with the unique operating conditions of an MWPC in the LHC experiment. Results of the complex studies of MWPCs, where spontaneous currents of tens of microamperes regularly appeared, show that nanocarbon graphite-like structures are formed on the detector cathodes. It is the nanocarbon structures on the copper foil of the cathode that cause spontaneous self-sustained currents in an MWPC.

Yu.F. Pirogov, O.V. Zenin

  (NRC KI -- IHEP)

Quartet-metric gravity and scalar graviton dark holes.
  Video
  Abstract:
In the framework of the quartet-metric gravity -- the concept of space--time with a metric extended by a set of selected dynamic vacuum coordinates as analogues of gravitational Higgs fields, the so called ``dark holes'' merging a central black hole and a peripheral scalar graviton dark halo are considered. It is shown that the dark holes may naturally explain asymptotically flat rotation curves, attributed conventionally to the existence of some dark matter. Possibilities of further modification of the basic dark holes, to convert them to more realistic ones for application in astrophysics and cosmology, are discussed.

V.P. Mitrofanov

  (Lomonosov Moscow State University, Moscow)

Gravitation waves and detection of them.
  Video
  Abstract:
A. Einstein predicted the gravitation waves in 1916 but they were observed for the first time by the LIGO (Laser Interferometer Gravitational-Wave Observatory) detector in 2015 from the collision of two black holes. Up to now, the gravitation waves were detected more than 200 times. Recently, new generation detectors are developed which will permit to answer many fundamental question in physics and astronomy.

K.A.Кuzakov

  (Lomonosov Moscow State University, Moscow)

Status and prospects of the tritium neutrino experiment SATURNE.
  Video
  Abstract:
The Sarov Tritium Neutrino Experiment (SATURNE) is part of the scientific program of the NCPhM and is currently at the R&D stage. The experiment will employ a tritium source of electron antineutrinos with an activity of at least 10 MCi (1 kg of tritium) and possibly up to 40 MCi (4 kg of tritium). It is expected that measurements using a He-4 detector in the superfluid state will allow for the first time to observe coherent elastic neutrino-atom scattering and to discover the neutrino magnetic moment μ_ν, or to set a new record upper limit on its value at the level of ~10^{-13} μB (90% C.L.). It is also planned to measure the ionization channel of neutrino-atom interactions using Si and SrI2(Eu) detectors with record-low energy thresholds for the corresponding detection systems, which will allow achieving sensitivity to the μ_ν value at the level of ~10^{-12} µB (90% C.L.).

V.F. Obrazstov

  (IHEP, Serpukhov)

OKA Experiment. Results on Kaon Decays.
  Video

V.I. Sbitnev

  (NRC KI - PNPI)

Relic Majorana Fermions as Possible Candidates for Dark Matter Particles.
  Abstract:
Among possible candidates for the role of dark matter particles, ranging from WIMPs (weakly interacting massive particles) to ultralight axions, Majorana fermions occupy an intermediate position in this line of candidates in terms of masses comparable to neutrino masses. The main paradigm underlying the derivation of the Majorana fermion is Lambda + Cold Dark Matter - LambdaCDM (Cold Dark Matter). The resulting formula for the mass of the Majorana fermion contains three key parameters - Planck's constant, the critical density distribution of dark matter, and the temperature of the relict cosmic radiation (T = 2.725 K). The calculated mass of the fermion (~0.04 eV) gives good agreement with the experimentally measured neutrino masses. This gives grounds to assert that Majorana fermions represent neutrinos. It follows from the formula that there may be three generations of fermions, each of which shows differences in mass.

V.P. Neznamov

  (VNIIEF, Sarov)

Quantum Models of Electron with Zero Self-energy.
  Video
  Abstract:
Two models of the electron with zero self-energy are proposed on the basis of the modernized regular charged Reissner-Nordtstr$\"{o}$m and Kerr-Newman metrics with quantum cores.

A.N. Semenova

  (NRC KI - PNPI)

Teleparallel Theory of Gravity by Hayashi-Shirafuji.
  (Presentation)
  Abstract:
The generally accepted theory of gravity is Einstein's General Theory of Relativity (GTR), where gravity is a consequence of the curvature of space-time due to the presence of matter. Despite the great success of this approach, there are certain difficulties with quantizing GTR and with describing Dark Matter within its framework. There is an idea to modify the theory of gravity in such a way that the effects of Dark Matter can be described as purely gravitational. One of the variants of such a modification is the teleparallel theory by Hayashi-Shirafuji, where the main geometric characteristic is torsion, and the dynamic variable is a tetrad.