Focus on:  Hide Contributions
Back to Conference View
Login

Particles and Cosmology – 2025

→ Europe/Moscow
Conference hall (Smile Hotel, Terskol, Russia)

Conference hall

Smile Hotel, Terskol, Russia

Razvilka Cheget, Terskol, Kabardino-Balkarian Republic, Russia, 361605 +7 (928) 077-00-09 Развилка Чегет, Терскол, Кабардино-Балкарская Республика, Россия, 361605 +7 (928) 077-00-09
Description

header_image

Particles and Cosmology

17th Baksan School on Astroparticle Physics

The program of the school will include four lecture courses followed by tutorials, practical and discussion sessions, several separate lectures, group projects for participants, and excursion to the Baksan Neutrino Observatory. The working language of the School is English. Participants who successfully complete the School program will receive a Certificate of Participation.

Contact
  • Thursday, 3 April
    • 16:00 → 19:00
      Registration 3h
    • 19:00 → 21:00
      Welcome Dinner 2h
  • Friday, 4 April
  • Saturday, 5 April
  • Sunday, 6 April
  • Monday, 7 April
    • 08:00 → 09:00
      Breakfast 1h
    • 09:00 → 10:15
      Anatomy of Large Neutrino Telescopes (Grigory Safronov) Conference hall

      Conference hall

      Smile Hotel, Terskol, Russia

      Razvilka Cheget, Terskol, Kabardino-Balkarian Republic, Russia, 361605 +7 (928) 077-00-09 Развилка Чегет, Терскол, Кабардино-Балкарская Республика, Россия, 361605 +7 (928) 077-00-09
      Safronov_baksSch25_lecture1_fin.pdf
      Safronov_baksSch25_lecture2_fin.pdf
      Safronov_BaksSch25_lecture3_fin.pdf
      Safronov_BaksSch25_lecture4_fin.pdf
    • 10:15 → 10:30
      Coffee Break 15m
    • 10:30 → 11:45
      Origin of the Most Energetic Particles in the Universe (Evgeny Derishev) Conference hall

      Conference hall

      Smile Hotel, Terskol, Russia

      Razvilka Cheget, Terskol, Kabardino-Balkarian Republic, Russia, 361605 +7 (928) 077-00-09 Развилка Чегет, Терскол, Кабардино-Балкарская Республика, Россия, 361605 +7 (928) 077-00-09
      Derishev_BaksanSchool25_Lecture1.pdf
      Derishev_BaksanSchool25_Lecture2.pdf
      Derishev_BaksanSchool25_Lecture3.pdf
      Derishev_BaksanSchool25_Lecture4.pdf
    • 12:00 → 13:00
      Lunch 1h
    • 13:00 → 17:15
      Free Time 4h 15m
    • 17:15 → 17:45
      Introductory Lectures about Baksan Neutrino Observatory: Baksan Neutrino Observatory. Current Status and Prospects (Valery Petkov) Conference hall

      Conference hall

      Smile Hotel, Terskol, Russia

      Razvilka Cheget, Terskol, Kabardino-Balkarian Republic, Russia, 361605 +7 (928) 077-00-09 Развилка Чегет, Терскол, Кабардино-Балкарская Республика, Россия, 361605 +7 (928) 077-00-09
      DBD_Kazalov.pdf
      New Gall Exp.pdf
      Petkov_BNO_070425.pdf
      • 17:15
        Baksan Neutrino Observatory. Current Status and Prospects 30m
        Speaker: Valery Petkov (INR RAS)
        Petkov_BNO_070425.pdf
    • 17:45 → 18:15
      Introductory Lectures about Baksan Neutrino Observatory: Double Beta Decay (Vladimir Kazalov) Conference hall

      Conference hall

      Smile Hotel, Terskol, Russia

      Razvilka Cheget, Terskol, Kabardino-Balkarian Republic, Russia, 361605 +7 (928) 077-00-09 Развилка Чегет, Терскол, Кабардино-Балкарская Республика, Россия, 361605 +7 (928) 077-00-09
      DBD_Kazalov.pdf
      New Gall Exp.pdf
      Petkov_BNO_070425.pdf
      • 17:45
        Double Beta Decay 30m
        Speaker: Vladimir Kazalov (INR RAS)
        DBD_Kazalov.pdf
    • 18:15 → 18:45
      Introductory Lectures about Baksan Neutrino Observatory: Neutrino Experiments with Gallium Target (Valery Gorbachev) Conference hall

      Conference hall

      Smile Hotel, Terskol, Russia

      Razvilka Cheget, Terskol, Kabardino-Balkarian Republic, Russia, 361605 +7 (928) 077-00-09 Развилка Чегет, Терскол, Кабардино-Балкарская Республика, Россия, 361605 +7 (928) 077-00-09
      DBD_Kazalov.pdf
      New Gall Exp.pdf
      Petkov_BNO_070425.pdf
      • 18:15
        Neutrino Experiments with Gallium Target 30m
        Speaker: Valery Gorbachev (INR RAS)
        New Gall Exp.pdf
    • 19:00 → 20:00
      Dinner 1h
    • 20:00 → 21:15
      Evening Lecture: Hands-on Course: Silicon Eyes of Experiments (Nikolai Anphimov and Alexander Selyunin) Conference hall

      Conference hall

      Smile Hotel, Terskol, Russia

      Razvilka Cheget, Terskol, Kabardino-Balkarian Republic, Russia, 361605 +7 (928) 077-00-09 Развилка Чегет, Терскол, Кабардино-Балкарская Республика, Россия, 361605 +7 (928) 077-00-09
      2504-Baksan-Samoylov.pdf
      Baksan_2025_prac.pdf
      Baksan_School_SiPM_Prac.pdf
      From DNA to the Stars.pdf
      Sobisevich_2025_BaksanSchool.pdf
  • Tuesday, 8 April
    • 07:30 → 08:30
      Breakfast 1h
    • 08:30 → 09:00
      Departure to the Baksan Neutrino Observatory 30m
    • 09:00 → 14:00
      Excursion to Baksan Neutrino Observatory Branch Baksan Neutrino Observatory, Neutrino village, Elbrus district, Russia

      Branch Baksan Neutrino Observatory, Neutrino village, Elbrus district, Russia
      SIGN UP TO THE EXCURSION
    • 14:00 → 15:00
      Lunch 1h
    • 15:00 → 15:30
      Seminar about Baksan Neutrino Observatory: Cosmic Rays in a Thunderstorm Atmosphere. Experiment at Baksan and Other Experiments (Alexander Lidvansky) Conference hall

      Conference hall

      Smile Hotel, Terskol, Russia

      Razvilka Cheget, Terskol, Kabardino-Balkarian Republic, Russia, 361605 +7 (928) 077-00-09 Развилка Чегет, Терскол, Кабардино-Балкарская Республика, Россия, 361605 +7 (928) 077-00-09
      BaksanSchool_Carpet_EAS_Romanenko_v1.pdf
      Gangashev_Experimental Searches for the Axion_P&C2025.pdf
      Kochkarov_BMSH_2025.pdf
      Unatlokov_IB_17th_Baksan_School_on_Astroparticle_Physics_ENG.pdf
      ЭкспНаБНО_Школа2025_Khaerdinov.pdf
    • 15:30 → 16:00
      Seminar about Baksan Neutrino Observatory: Experimental Searches for the Axion (Albert Gangapshev) Conference hall

      Conference hall

      Smile Hotel, Terskol, Russia

      Razvilka Cheget, Terskol, Kabardino-Balkarian Republic, Russia, 361605 +7 (928) 077-00-09 Развилка Чегет, Терскол, Кабардино-Балкарская Республика, Россия, 361605 +7 (928) 077-00-09
      BaksanSchool_Carpet_EAS_Romanenko_v1.pdf
      Gangashev_Experimental Searches for the Axion_P&C2025.pdf
      Kochkarov_BMSH_2025.pdf
      Unatlokov_IB_17th_Baksan_School_on_Astroparticle_Physics_ENG.pdf
      ЭкспНаБНО_Школа2025_Khaerdinov.pdf
    • 16:00 → 16:25
      Seminar about Baksan Neutrino Observatory: Search for Astrophysical Neutrino Sources at BUST (Islam Unatlokov) Conference hall

      Conference hall

      Smile Hotel, Terskol, Russia

      Razvilka Cheget, Terskol, Kabardino-Balkarian Republic, Russia, 361605 +7 (928) 077-00-09 Развилка Чегет, Терскол, Кабардино-Балкарская Республика, Россия, 361605 +7 (928) 077-00-09
      BaksanSchool_Carpet_EAS_Romanenko_v1.pdf
      Gangashev_Experimental Searches for the Axion_P&C2025.pdf
      Kochkarov_BMSH_2025.pdf
      Unatlokov_IB_17th_Baksan_School_on_Astroparticle_Physics_ENG.pdf
      ЭкспНаБНО_Школа2025_Khaerdinov.pdf
    • 16:25 → 16:50
      Seminar about Baksan Neutrino Observatory: Experimental Search for Neutrino Bursts from Collapsing Stars at BUST (Makhti Kochkarov) Conference hall

      Conference hall

      Smile Hotel, Terskol, Russia

      Razvilka Cheget, Terskol, Kabardino-Balkarian Republic, Russia, 361605 +7 (928) 077-00-09 Развилка Чегет, Терскол, Кабардино-Балкарская Республика, Россия, 361605 +7 (928) 077-00-09
      BaksanSchool_Carpet_EAS_Romanenko_v1.pdf
      Gangashev_Experimental Searches for the Axion_P&C2025.pdf
      Kochkarov_BMSH_2025.pdf
      Unatlokov_IB_17th_Baksan_School_on_Astroparticle_Physics_ENG.pdf
      ЭкспНаБНО_Школа2025_Khaerdinov.pdf
      • 16:25
        Experimental Search for Neutrino Bursts from Collapsing Stars at BUST 25m
        Speaker: Mahti Kochkarov (ITAE RAS)
        Kochkarov_BMSH_2025.pdf
    • 16:50 → 17:15
      Seminar about Baksan Neutrino Observatory: Gamma-ray Astronomy at Carpet Experiment (Viktor Romanenko) Conference hall

      Conference hall

      Smile Hotel, Terskol, Russia

      Razvilka Cheget, Terskol, Kabardino-Balkarian Republic, Russia, 361605 +7 (928) 077-00-09 Развилка Чегет, Терскол, Кабардино-Балкарская Республика, Россия, 361605 +7 (928) 077-00-09
      BaksanSchool_Carpet_EAS_Romanenko_v1.pdf
      Gangashev_Experimental Searches for the Axion_P&C2025.pdf
      Kochkarov_BMSH_2025.pdf
      Unatlokov_IB_17th_Baksan_School_on_Astroparticle_Physics_ENG.pdf
      ЭкспНаБНО_Школа2025_Khaerdinov.pdf
    • 17:15 → 18:45
      Poster Session Conference hall

      Conference hall

      Smile Hotel, Terskol, Russia

      Razvilka Cheget, Terskol, Kabardino-Balkarian Republic, Russia, 361605 +7 (928) 077-00-09 Развилка Чегет, Терскол, Кабардино-Балкарская Республика, Россия, 361605 +7 (928) 077-00-09
      • 17:15
        Application of the amplitude analysis method to the study of mass and angular spectra of heavy tetraquarks in di-J/psi and J/psi-psi(2S) decay channels 15m

        The experimental discovery of resonant-like states in the di-J/psi mass spectra in pp-collisions near the production threshold suggests the existence of fully-charmed tetraquarks (broad structure at 6600 MeV and narrow structures at 6900 and 7200 MeV). Numerous theoretical models following this discovery provide descriptions of the observed data, propose mechanisms underlying formation of this new states, and predict additional phenomena.
        Further investigations require precision experimental measurements. In this work, the amplitude analysis method is applied to describe mass and angular spectra of the observed signals in ATLAS experimental data simultaneously in J/psi-J/psi and J/psi-psi(2S) decay channels. Mass and width of the resonances are measured accounting for interference effects between signals and background.

        Speaker: Alisa Didenko (Joint Institute for Nuclear Research (JINR))
      • 17:15
        Event selection for the NOvA 3 flavor analysis 15m

        NOvA is a long-baseline accelerator-based neutrino oscillation experiment designed to measure electron (anti-)neutrino appearance and muon (anti-)neutrino disappearance. The experiment employs a 297t near detector at Fermilab and a larger 14kt far detector in Minnesota, both are tracking calorimeters filled with liquid scintillator. Event selection in NOvA is crucial for distinguishing neutrino interactions from background events. The experiment utilizes advanced techniques, including a Convolutional Visual Network algorithm, for event identification, categorization, and reconstruction. In 2024 the latest results of the 3-flavor oscillation analysis were obtained. They based on 10 years of data collecting, equivalent to 26.6e20 protons-on-target (POT) statistics with neutrino beam and 12.5e20 POT with antineutrino. In this poster, an improved event selection method will be presented. The main focus is on enhancing the statistic by low-energy electron neutrino events, which is useful for increasing the sensitivity to neutrino mass ordering.

        Speaker: Anastasiia Kalitkina (Joint Institute for Nuclear Research)
      • 17:15
        Exploring Exotic and Non-Standard Phenomena in the NOVA Experiment 15m

        The NOvA experiment, primarily focused on neutrino oscillation studies, also provides a unique platform to search for exotic and non-standard physics phenomena. In this poster, we present the ongoing analyses in the following topics: atmospheric and cosmogenic neutrinos, slow magnetic monopoles, high-energy muons, low-ionizing particles, neutron-antineutron oscillation. We will outline the current status of each analysis, highlight the methods and techniques, and discuss the preliminary results. We also highlight the importance of these searches for our scientific knowledge.

        Speaker: Aleksandra Ivanova (JINR, ISU)
        Poster Baksan 2025.pdf
      • 17:15
        Neutrino production in the central dark-matter spikes of active galaxies 15m

        Recent multi-messenger observations suggest that high-energy neutrinos may be produced close to central black holes in active galaxies. These regions may host dark-matter (DM) spikes, where the concentration of DM particles is very high. Here we explore the contribution of the DM annihilation to the target photons for the neutrino production, proton-photon interactions, estimate the associated neutrino spectrum and figure out possible future tests of this scenario.

        Speaker: Kivokurtseva Polina (INR RAS; MSU)
      • 17:30
        Energy spectrum of primary cosmic rays according to the NEVOD-EAS array data 15m

        The main source of information about high-energy cosmic rays (above 1015 eV) are extensive air showers (EAS), which are formed as a result of interaction of primary cosmic rays (PCR) with nuclei of atmospheric atom. In the energy range from 1015 to 1017 eV the PCR energy spectrum, reconstructed by the data of EAS experiments, has features which cannot be explained within the frameworks of existing models of cosmic ray origin.
        To study air-shower in the energy range 1015–1017 eV, the NEVOD-EAS array was constructed at the MEPhI (Moscow). It consists of 9 clusters deployed around the Experimental Complex NEVOD. The cluster includes 4 detector stations measuring energy deposit and arrival time of secondary EAS particles.
        The technique for reconstructing air-shower parameters and PCR energy spectrum based on the response of the NEVOD-EAS array is described. It has been tested using the simulation in the CORSIKA program and the QGSJET-II-04 + FLUKA hadronic interaction model. In total 3 000 000 air-showers from primary protons and iron nuclei have been analyzed in the energy range 1014-1017 eV. The results of reconstruction of the primary particles energy based on the developed technique are presented.

        Speaker: Elena Yuzhakova (MEPhI)
      • 17:30
        Hypothetical Lorentz invariance violation and the muon content of extensive air showers 15m

        Extensive air showers (EAS), produced by cosmic rays in the atmosphere, serve as probes of particle interactions, providing access to energies and kinematical regimes beyond the reach of laboratory experiments. Measurements from multiple cosmic-ray detectors indicate a significant, yet unexplained, discrepancy between the observed muon content in EAS and that predicted by state-of-the-art interaction models, suggesting a need for refinements in our understanding of fundamental physics. Here we show that a tiny, experimentally allowed, violation of the Lorentz invariance (LIV) may result in the suppression of the number of electrons in EAS, leaving the muon number intact and explaining both the ''muon excess'' and its energy dependence. On the other hand, we use the lack of a much stronger discrepancy between EAS data and simulations to obtain strict constraints on the LIV scale. Future experimental tests of this LIV scenario are outlined.

        Speaker: Андрей Шарофеев (МГУ им. М. В. Ломоносова, ИЯИ РАН)
      • 17:30
        Search for photon-induced air showers at the Carpet-3 experiment 15m

        We report our results on the new technique for searching for photon-induced EAS events at the Carpet-3 experiment. To search for photon-like events, we employ a neural network, trained on Monte-Carlo simulations of the experiment. On Monte-Carlo simulations our method achieves considerably higher background rejection efficiency than traditional methods, particularly for EAS events with high muon content. We also report on the 300 TeV gamma ray event associated with GRB221009A.

        Speaker: Nikita Pozdnukhov (INR RAS)
      • 17:30
        Search for two-neutrino double electron capture on Ar-36 with DarkSide-50 detector 15m

        Two-neutrino double electron capture is a rare nuclear decay where two electrons are simultaneously captured from the atomic shells and two neutrinos are carried away.
        The measurements of the energies of the emitted particles and the half-life of the 2EC2$\nu$ decay to the ground state are of great interest to nuclear physics. The model predictions for 2EC2$\nu$ half-life are based on the evaluation of form the main source of NME. The NME calculations are complicated and have large uncertainties. Therefore, if retrieved from experiment, half-life values can serve as a test for nuclear theory. In the one model framework some constraints on the 2EC0$\nu$ NME can be derived using supposed values of the 2EC2$\nu$ NME, so the estimation of 2EC2$\nu$ half-life could help to study physics beyond the Standard Model.An estimate of the sensitivity of the DarkSide-20k experiment, which will be launched in the next few years, is also given.

        The novelty of this work is in the fact that such processes have not previously been studied on the argon isotope $^{36}$Ar. In this work, a search is made for two-neutrino double electron capture in the KK and KL shells of $^{36}$Ar, using exposition of about 12 ton-day of data from the DarkSide-50 dark matter detector. As a preliminary result of the analysis, no significant excess above background was found, which allowed us to estimate that the half-life limits with CL=90%. An estimate of the sensitivity of the DarkSide-20k experiment, which will be launched in the next few years, is also given.

        Speaker: Olga Lychagina (JINR)
      • 17:45
        Charged pion momentum reconstruction in the 3D-segmented neutrino detector SuperFGD. 15m

        To achieve enhanced precision in neutrino analysis, it is crucial to consider the kinematic distributions of reaction products. This poster will showcase methods for reconstructing the momentum of charged pions within the novel neutrino detector SuperFGD of the T2K experiment. Additionally, comparisons will be presented between the developed statistical and machine learning approaches.

        Speaker: Daria Fedorova (MIPT & INR RAS)
      • 17:45
        Inflation after Curvature Bounce 15m

        We present a stable cosmological model of a closed universe in the presence of conventional scalar
        field. The stability of the model and the absence of singularity is ensured by spatial curvature
        without the need for additional peculiar matter. We reconstruct the Lagrangian and numerically
        compute observational predictions, including the number of e-folds, the spectral index $n_s$, and the
        tensor-to-scalar ratio. We present several sets of parameters that satisfy the current observational
        data.

        Speaker: Rinat Kagirov (Institute for Nuclear Research of the Russian Academy of Sciences (INR RAS))
        2412.21087v1.pdf
        Baksan_Poster.pdf
      • 17:45
        Modifying EAS parameters reconstruction algorithms for Carpet-3 detector array 15m

        Carpet-3 is a detector array for high-energy ($E \geq 100 TeV$) extensive atmospheric shower (EAS) detection. It is situated at geographical coordinates: $43,273^\circ N, 42,685^\circ E$, 1700 m above sea level. It consists of a central part $196 m^2$ in area, an underground muon detector $410 m^2$ in area and 30+ remote registration points.

        We have created a model of Carpet-3 using Geant4 package. It takes the geometry of the detectors and facility buildings, the scintillation processes and light collection nuances into account.

        We created a dataset of $\approx$ 85,000 low-energy EAS with the help of CORSIKA. By simulating the response of the detector array to these showers, we were able to calculate the precision of different reconstruction techniques used to estimate such EAS parameters as $E, \theta, \varphi, N_e, s$.

        Speaker: Nikita Vasiliev (MSU)
      • 17:45
        Performance of SuperFGD in the T2K neutrino beam 15m

        The T2K long-baseline neutrino oscillation experiment is designed to probe CP violation in the neutrino sector and to perform precise measurements of neutrino oscillation parameters. The T2K neutrino beam, produced at J-PARC, is detected by the near detector ND280, located 280 meters downstream from the proton target. The recent upgrade of the ND280 was accomplished to reduce systematic uncertainties and to improve measurements of the neutrino beam as the oscillations become more significant. A core element of the upgrade is the Super Fine-Grained Detector (SuperFGD) that consists of 2 million scintillator cubes. Signals from each cube are read out by three orthogonal wavelength-shifting (WLS) fibers and detected by micropixel photodetectors (MPPCs).
        SuperFGD provides enhanced detection capabilities, allowing it to efficiently select high-angle and low-momentum particles, accumulate a larger sample of neutrino interactions, and detect neutrons. The detector has a high light yield for charged particles, high time resolution, and a low detection threshold.
        SuperFGD was installed in the ND280 pit at J-PARC in October 2023 and began full data taking in June 2024. The detection of muon neutrinos in SuperFGD via charged current in the T2K neutrino beam and reconstruction of stopped protons, long particle tracks, and multi-track events in SuperFGD will be presented. Key parameters such as time resolution and attenuation length will be discussed in detail.
        Supported by the RSF grant # 24-12-00271

        Speaker: Angelina Chvirova (INR RAS)
      • 18:00
        Axion-like particle emission from type Ia supernovae 15m

        Axion-like particles (ALPs) are a class of hypothetical bosons beyond the standard model of particle physis, which are
        very weakly-interacting and long- lived. Since many ALPs may be produced in hot plasma in supernovae (SNe), a nearby
        SNe Ia can be used as a probe of ALPs. It is desirable to predict the ALP emission from SNe Ia to discuss a possible
        constraint that can be obtained from the event. ALPs may convert into photons and back in the magnetic field in the
        intergalactic space and galaxies. It is hence possible to constrain the ALP parameters by γ-ray observations of a nearby
        astronomical object which emits a lot of ALPs. Here, we calculate the ALP emission from type Ia SNe and take into the
        account the light range of ALPs mass. Using the SN Ia model, we consider the issue of detection a photon flash from
        SNe Ia.

        Speaker: Даниил Давыдов (МГУ, ИЯИ)
      • 18:00
        Emission of gravitational waves by cosmic domain walls with constant tension 15m

        Employing the publicly available CosmoLattice code, we conduct numerical simulations of a domain wall network and the resulting gravitational waves (GWs) in a radiation-dominated Universe in the $Z_2$-symmetric scalar field model. In particular, the domain wall evolution is investigated in detail both before and after reaching the scaling regime, using the combination of numerical and theoretical methods. We demonstrate that the total area of closed walls is negligible compared to that of a single long wall stretching throughout the simulation box. Therefore, the closed walls are unlikely to have a significant impact on the overall network evolution. This is in contrast with the case of cosmic strings, where formation of loops is crucial for maintaining the system in the scaling regime. To obtain the GW spectrum, we develop a technique that separates physical effects from numerical artefacts arising due to finite box size and non-zero lattice spacing. Notably, we observe a peak at the Hubble scale, an exponential falloff at scales shorter than the wall width, and a plateau/bump at intermediate scales. We also study sensitivity of obtained results on the choice of initial conditions. We find that different types of initial conditions lead to qualitatively similar domain wall evolution in the scaling regime, but with important variations translating into different intensities of GWs.

        Speaker: Ivan Dankovsky (INR RAS and MSU)
      • 18:00
        Modeling of particle acceleration in star clusters with 3D-MHD simulations 15m

        Young compact clusters of massive stars contain dozens of O-, B- and WR-type stars with fast powerful winds in a small $\sim$ pc radius. The acceleration of particles by ensembles of shocks and waves of compression and rarefaction in the turbulent environment of young massive star clusters (YMSCs) is an alternative to the standard paradigm of Galactic cosmic rays acceleration on supernova shocks. In recent years, the topic is of great interest due to the fact that modern gamma- and X-ray observatories are detecting the radiation from YMSCs (e.g. Westerlund 1, 2), which indicates on particle acceleration processes in these objects. We study propagation and acceleration of particles in a YMSC with the help of 3D magnetohydrodynamic (MHD) modeling using PLUTO, an open source code based on the numerical solution of MHD equations with the Godunov scheme [1]. The code allows modeling of the turbulent environment of YMSCs and obtaining crucial for particle acceleration values of velocity, density and magnetic field inside the cluster core [2]. The particle module implemented in PLUTO allows solving the equations of motion for test charged particles together with MHD equations for the medium. We obtained that protons acceleration up to hundreds of TeV takes place in the cluster core near the termination shocks of O-stars, which are surrounded by shocks of their neighbour stars. The particle spectra and spatial distribution are discussed.

        [1] Mignone A, Bodo G, Massaglia S, Matsakos T, Tesileanu O, Zanni C and
        Ferrari A 2007 ApJS 170 228–242 (Preprint astro-ph/0701854)
        [2] Badmaev D V, Bykov A M and Kalyashova M E 2022 MNRAS 517 2818
        2830 (Preprint 2209.11465)

        Speaker: Maria Kalyashova (Ioffe Institute)
      • 18:00
        TeV-PeV neutrinos from AGN coronae 15m

        In this paper, we attempt to explain the TeV-PeV neutrinos observed by IceCube by assuming that they originate from active galactic nuclei. The results are obtained in the model where the accretion disk emits in the UV-optical range inside the electron plasma cloud. Using a Monte-Carlo approach to simulate photopion interactions in the jets and then taking into account the cosmological evolution, we generalize the results of previous researchers within this approach by taking into account the coronal emission.

        Speaker: Simon Sotirov (INR RAS, MSU)
      • 18:15
        Anomalous cosmic-ray correlations of the TA arrival directions with BL Lacs 15m

        Stereoscopic fluorescent observations by the High Resolution Fly's Eye detector revealed correlations between arrival directions of ultra-high-energy cosmic rays and positions of distant BL Lac type objects (Gorbunov et al. 2004, Abbasi et al. 2005). They implied the existence of non-deflected particles travelling for cosmological distances, hard to explain within standard physics and astrophysics. These correlations have not been conclusively tested with independent data. Here, we present the results of such testing performed with the Telescope Array data set.

        Speaker: Maria Kudenko (INR RAS & MSU)
      • 18:15
        Application of machine learning in lattice quantum theory 15m

        The numerical calculation of observables in quantum theory is reduced to the sampling from a set of random variables with a joint distribution density defined analytically on the basis of physical theory. This problem is solved by various modifications of the Metropolis method, but it requires significant computational costs with a large sample size and the number of random variables describing the physical system. An alternative approach based on generative machine learning models is being considered. The features of the problem, such as translational symmetry, are analyzed in the context of building the most optimal architecture.

        Speaker: Dmitry Salnikov (INR RAS & Lomonosov MSU)
      • 18:15
        Cosmological constant due to quantum corrections to the effective potential 15m

        In this work, we show that quantum corrections to some cosmological models [1] can lead to a significant modification of the behaviour of the initial potential and the appearance of a non-zero ground state energy of the Universe which can be interpreted as a cosmological constant.
        We apply the formalism of the effective potential to the simplest forms of $\alpha$-attractors which can be represented by the so-called $T$-models and $E$-models [2]. We derived the generalised renormalisation group (RG) equations that sum up the whole sequence of leading logarithmic contributions to the effective potential. As a result, the accounting of quantum corrections leads to a change of character and a lift of the effective potential [3,4]. We interpreted this uplift as the appearance of the cosmological constant $\Lambda$ for the $T^{2}$ and $E^{2}$ models.
        Thus, we have found out that the cosmological constant $\Lambda$ may exist as a consequence of quantum corrections to the effective potential with some value of the scale transmutation parameter $\mu$ even in non-renormalizable models of inflation. And the value of the cosmological constant $\Lambda$ allows one to fix the parameter $\mu$ which is a free parameter in the non-renormalizable theory.

        [1] D.I. Kazakov, R.M. Iakhibbaev and D.M. Tolkachev, Leading all-loop quantum contribution to the effective potential in the inflationary cosmology, JCAP 09 (2023) 049 [2308.03872].
        [2] Renata Kallosh, Andrei Linde, and Diederik Roest. Superconformal Inflationary $\alpha$-Attractors. JHEP, 11:198, 2013.
        [3] Tolkachev D. M., Kazakov D. I., Iakhibbaev R. M., and Filippov V. A. Quantum corrections to effective potentials of simplest 𝛼-attractors. PoS, ICPPCRubakov2023:022,2024. [4] Kazakov D I, Iakhibbaev R M, V.
        [4] A. Filippov, R. M. Iakhibbaev, D. I. Kazakov, D. M. Tolkachev. "Cosmological constant due to quantum corrections to the effective potential" Natural Sci. Rev. 1 3 (2024), https://nsr-jinr.ru/index.php/nsr/article/view/16

        Speaker: Mr Vladislav Filippov (JINR BLTP)
      • 18:15
        Measurement of the CNO solar neutrino flux in Borexino 15m

        About 1% of solar neutrinos are produced in the CNO cycle. Despite their subdominant role in the energy production, CNO neutrinos provide important information on the abundance of heavy elements in the solar core. In this work we present the details of the final analysis of Borexino data for measuring the flux of solar CNO neutrinos. This analysis features the fit of the electron recoil spectrum alongside with the directional information of neutrino events.

        Speaker: Alina Vishneva
      • 18:30
        Detection of Gamma Rays from the Crab Nebula with TAIGA-IACT Telescopes in Stereo Mode Based on 2020–2023 Data 15m

        The TAIGA astrophysical complex [1], located in the Tunka Valley, 50 km from Lake Baikal, was developed for research in the field of ultra-high-energy gamma-ray astronomy and cosmic ray physics. This report provides a detailed description of the methodology for detecting gamma rays using the TAIGA-IACT atmospheric Cherenkov telescopes in stereo mode [2] and presents the results obtained from observations of the gamma-ray source in the Crab Nebula. The report includes:

        • The methodology for reconstructing the parameters of extensive air showers (EAS) detected in stereo observation mode;
        • The procedure for gamma-hadron separation;
        • The calculation of the effective area for the facility with two and three TAIGA-IACT telescopes;
        • The energy spectrum of gamma rays from the Crab Nebula.

        References
        1. L. A. Kuzmichev et al., Cosmic ray study at the astrophysical complex TAIGA: Results and plans // Physics of Atomic Nuclei, 2021, Vol. 84, No. 6, P. 966–974.
        2. P. A. Volchugov et al., γ-ray detection with the TAIGA-IACT installation in the stereo mode of observation // Instruments and Experimental Techniques, 2024, Vol. 67, No. 1, P. 143–152.

        Speaker: Pavel Volchugov (SINP MSU)
      • 18:30
        Sterile Neutrino Dark Matter 15m

        We examine the sterile neutrino dark matter production in the primordial plasma with lepton asymmetry. The model parameter space (sterile-active neutrino mixing angle, sterile neutrino mass) is heavily limited by cosmological considerations and astrophysical observations. We argue that, with specifically tuned flavor fractions (electron, muon and tau) of the initial lepton asymmetry, one can mitigate limits from the Big Bang Nucleosynthesis on the model parameter space. This finding opens a window of lower sterile-active mixing angles. Likewise we show that, with lepton asymmetry disappearing from the plasma at certain intermediate stages of the sterile neutrino production, the spectrum of produced neutrinos becomes much colder, that weakens the limits on the model parameter space from observations of cosmic small-scale structures (Ly-$\alpha$ forest, galaxy counts, etc.). This finding reopens the region of lighter sterile neutrinos. The new region may be explored with the next generation of X-ray telescopes searching for the inherent peak signature provided by the dark matter sterile neutrino radiative decays in the Galaxy.

        Speaker: Dmitry Kalashnikov (INR RAS, MIPT)
      • 18:30
        SuperNova Early Warning System status and plans 15m

        SuperNova Early Warning System (SNEWS) is an international network of neutrino experiments, aiming at the real-time search and analysis of neutrino signals for providing the early warning of galactic supernova.
        This system has been operating since 1998 in a simple coincidence mode.

        In this work we present the current status and plans of an ongoing major upgrade of the SNEWS system, which includes studying theoretical predictions of supernova neutrino signals and expected observable effects in various neutrino detectors, applying more advanced coincidence techniques, accounting for directional information and a search for pre-supernova neutrino signal.

        Speaker: Andrey Sheshukov (JINR)
    • 19:00 → 20:00
      Dinner 1h
    • 20:00 → 21:15
      Poster Session Conference hall

      Conference hall

      Smile Hotel, Terskol, Russia

      Razvilka Cheget, Terskol, Kabardino-Balkarian Republic, Russia, 361605 +7 (928) 077-00-09 Развилка Чегет, Терскол, Кабардино-Балкарская Республика, Россия, 361605 +7 (928) 077-00-09
  • Wednesday, 9 April
    • 08:00 → 09:00
      Breakfast 1h
    • 09:00 → 10:15
      Origin of the Most Energetic Particles in the Universe (Evgeny Derishev) Conference hall

      Conference hall

      Smile Hotel, Terskol, Russia

      Razvilka Cheget, Terskol, Kabardino-Balkarian Republic, Russia, 361605 +7 (928) 077-00-09 Развилка Чегет, Терскол, Кабардино-Балкарская Республика, Россия, 361605 +7 (928) 077-00-09
      Derishev_BaksanSchool25_Lecture1.pdf
      Derishev_BaksanSchool25_Lecture2.pdf
      Derishev_BaksanSchool25_Lecture3.pdf
      Derishev_BaksanSchool25_Lecture4.pdf
    • 10:15 → 10:30
      Coffee Break 15m
    • 10:30 → 11:45
      Anatomy of Large Neutrino Telescopes (Grigory Safronov) Conference hall

      Conference hall

      Smile Hotel, Terskol, Russia

      Razvilka Cheget, Terskol, Kabardino-Balkarian Republic, Russia, 361605 +7 (928) 077-00-09 Развилка Чегет, Терскол, Кабардино-Балкарская Республика, Россия, 361605 +7 (928) 077-00-09
      Safronov_baksSch25_lecture1_fin.pdf
      Safronov_baksSch25_lecture2_fin.pdf
      Safronov_BaksSch25_lecture3_fin.pdf
      Safronov_BaksSch25_lecture4_fin.pdf
    • 12:00 → 13:00
      Lunch 1h
    • 13:00 → 17:30
      Free Time 4h 30m
    • 17:30 → 18:45
      Future of Particle Physics (discussion, moderators: D.I. Kazakov and S.V. Troitsky) Conference hall

      Conference hall

      Smile Hotel, Terskol, Russia

      Razvilka Cheget, Terskol, Kabardino-Balkarian Republic, Russia, 361605 +7 (928) 077-00-09 Развилка Чегет, Терскол, Кабардино-Балкарская Республика, Россия, 361605 +7 (928) 077-00-09
      • 17:30
        Future of Particle Physics 1h 15m
        Speakers: Dmitry Kazakov (BLTP JINR), Sergey Troitsky (INR RAS)
    • 19:00 → 20:00
      Dinner 1h
    • 20:00 → 21:15
      Future of Particle Physics (discussion, moderators: D.I. Kazakov and S.V. Troitsky) Conference hall

      Conference hall

      Smile Hotel, Terskol, Russia

      Razvilka Cheget, Terskol, Kabardino-Balkarian Republic, Russia, 361605 +7 (928) 077-00-09 Развилка Чегет, Терскол, Кабардино-Балкарская Республика, Россия, 361605 +7 (928) 077-00-09
      • 20:00
        Future of Particle Physics 1h 15m
        Speakers: Dmitry Kazakov (BLTP JINR), Sergey Troitsky (INR RAS)
  • Thursday, 10 April
    • 08:00 → 09:00
      Breakfast 1h
    • 09:00 → 10:15
      Anatomy of Large Neutrino Telescopes (Grigory Safronov) Conference hall

      Conference hall

      Smile Hotel, Terskol, Russia

      Razvilka Cheget, Terskol, Kabardino-Balkarian Republic, Russia, 361605 +7 (928) 077-00-09 Развилка Чегет, Терскол, Кабардино-Балкарская Республика, Россия, 361605 +7 (928) 077-00-09
      Safronov_baksSch25_lecture1_fin.pdf
      Safronov_baksSch25_lecture2_fin.pdf
      Safronov_BaksSch25_lecture3_fin.pdf
      Safronov_BaksSch25_lecture4_fin.pdf
    • 10:15 → 10:30
      Coffee Break 15m
    • 10:30 → 11:45
      Origin of the Most Energetic Particles in the Universe (Evgeny Derishev) Conference hall

      Conference hall

      Smile Hotel, Terskol, Russia

      Razvilka Cheget, Terskol, Kabardino-Balkarian Republic, Russia, 361605 +7 (928) 077-00-09 Развилка Чегет, Терскол, Кабардино-Балкарская Республика, Россия, 361605 +7 (928) 077-00-09
      Derishev_BaksanSchool25_Lecture1.pdf
      Derishev_BaksanSchool25_Lecture2.pdf
      Derishev_BaksanSchool25_Lecture3.pdf
      Derishev_BaksanSchool25_Lecture4.pdf
    • 12:00 → 13:00
      Lunch 1h
    • 13:00 → 14:00
      Free Time 1h
    • 14:00 → 17:00
      Student Projects Conference hall

      Conference hall

      Smile Hotel, Terskol, Russia

      Razvilka Cheget, Terskol, Kabardino-Balkarian Republic, Russia, 361605 +7 (928) 077-00-09 Развилка Чегет, Терскол, Кабардино-Балкарская Республика, Россия, 361605 +7 (928) 077-00-09
      baksan_projects.pdf
      • 14:00
        Student Projects 3h
    • 17:30 → 18:45
      Modern Statistical Methods and Tools (Grigory Rubtsov) Conference hall

      Conference hall

      Smile Hotel, Terskol, Russia

      Razvilka Cheget, Terskol, Kabardino-Balkarian Republic, Russia, 361605 +7 (928) 077-00-09 Развилка Чегет, Терскол, Кабардино-Балкарская Республика, Россия, 361605 +7 (928) 077-00-09
      2025_Rubtsov_Baksan_school_lec1.pdf
      2025_Rubtsov_Baksan_school_lec2.pdf
      2025_Rubtsov_Baksan_school_lec3.pdf
      2025_Rubtsov_Baksan_school_lec4.pdf
    • 19:00 → 20:00
      Dance Show 1h Conference hall

      Conference hall

      Smile Hotel, Terskol, Russia

      Razvilka Cheget, Terskol, Kabardino-Balkarian Republic, Russia, 361605 +7 (928) 077-00-09 Развилка Чегет, Терскол, Кабардино-Балкарская Республика, Россия, 361605 +7 (928) 077-00-09
    • 20:00 → 23:00
      Conference Dinner 3h
  • Friday, 11 April
    • 08:00 → 12:00
      Departure 4h
Powered by Indico v3.2.9