BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Overview on Neutrino Electromagnetic Properties and SATURNE Projec t on Coherent Elastic Neutrino-Atom Scattering DTSTART;VALUE=DATE-TIME:20261029T142000Z DTEND;VALUE=DATE-TIME:20261029T144000Z DTSTAMP;VALUE=DATE-TIME:20261022T065853Z UID:indico-contribution-317-6244@cern.ch DESCRIPTION:Speakers: Alexander Studenikin (Moscow State University)\nAfte r an introduction to the theory of neutrino electromagnetic properties [1\ ,2\,3] and a discussion of existing experimental constraints on the magnet ic moments of neutrinos and other electromagnetic characteristics obtained in ground-based experiments (including the latest estimates from XENONnT [4] and LUX-ZEPELIN [5]) and results from astrophysical observations [6\,7 ]\, we present the new SATURNE experiment\, which is being implemented in the National Center for Physics and Mathematics in Sarov [8\,9\,10]. The g oal of the SATURNE project is to detect for the first time the coherent el astic scattering of tritium antineutrinos on liquid helium target atoms in the superfluid state\, which will allow to obtain new upper limits (or to measure) the value of the neutrino magnetic moment on the scales. At the first stage of the implementation of the SATURNE project\, it is also plan ned to use a low-temperature scintillation and a cryogenic silicon antineu trino detectors.\n\n\n\n[1] C.Guinti\, A.Studenikin\, Neutrino electromagn etic interactions: A window to new physics\, Rev. Mod. Phys. 87 (2015) 53 1. \n[2] C.Giunti\, A.Kouzakov\, Y.F.Li\, A.Studenikin\, Neutrino electrom agnetic properties\, Annu. Rev. Nucl. Part. Sci. 2025\, 75: 1–29.\n[3] A .Studenikin\, Electromagnetic neutrinos: The basic interaction processes a nd constraints from laboratory experiments and astrophysics\, Int. J. of M od. Phys. E 33 (2024) 2441033.\n[4] A.Khan\, Light new physics and neutri no electromagnetic interactions in XENONnT\, Phys. Lett. B 837 (2023) 1376 50. \n[5] M.Atzori Corona et al.\, New constraint on neutrino magnetic mom ent from LZ dark matter search results\, Phys. Rev. D 107 (2023) 053001.\n [6] S.Jana and Y.Porto\, Resonances of supernova neutrinos in twisting mag netic fields\, \nPhys. Rev. Lett. 132 (2024) 101005.\n[7] V. Brdar\, A. de Gouvˆea.\, Y.-Y. Li\, P. Machado\, Neutrino magnetic moment portal\nand supernovae: New constraints and multimessenger opportunities\, Phys. Rev. D 107\n(2023) 073005.\n[8] M.Cadeddu\, F.Dordei\, C.Giunti\, K.Kouzakov\, E.Picciau\, A.Studenikin\, Potentialities of a low-energy detector based o n 4He evaporation to observe atomic effects in coherent neutrino scatterin g and physics perspectives\, Phys. Rev. D 100 (2019) 073014.\n[9] G.Donche nko\, K.Kouzakov\, A.Studenikin\, Elastic neutrino–atom scattering as a probe of neutrino millicharge and magnetic moment\, JETP Lett. 117 (2023) 879.\n[10] M.Cadeddu\, F.Dordei\, C.Giunti\, A. Ivashkin\, K.Kouzakov\, F .Lazarev\, O. Moskalev\, I.Stepantsov\, A.Studenikin\, I.Tkachev\, V.Trofi mov\, M.Verkhovtsev\, M.Vyalkov\,\nA.Yukhimchuk\, E.Zagirdinova\, SATURNE: The Sarov Tritium Neutrino Experiment for probing coherent elastic neutri no-atom scattering and neutrino electromagnetic interactions\, Springer Pr oc.Phys. 425 (2025) 99.\n\nhttps://indico.particle.mephi.ru/event/626/cont ributions/6244/ LOCATION:Sevastopol Hotel URL:https://indico.particle.mephi.ru/event/626/contributions/6244/ END:VEVENT BEGIN:VEVENT SUMMARY:DANSS detector upgrade for better energy resolution DTSTART;VALUE=DATE-TIME:20261028T132000Z DTEND;VALUE=DATE-TIME:20261028T133500Z DTSTAMP;VALUE=DATE-TIME:20261022T065853Z UID:indico-contribution-317-6510@cern.ch DESCRIPTION:Speakers: Dmitry Svirida (NRC 'Kurchatov Institute'\, P.N.Lebe dev Physical Institute RAS)\nThe DANSS detector recorded more than 10 mill ion antineutrino events from a nuclear reactor in almost 10 years of conti nuous running. The data taking has stopped in February 2026 in order to pe rform a significant upgrade. The obtained data sample exceeds that of any other neutrino experiment in the world and features remarkably low contrib ution from the cosmic background below 2%. At the same time only moderate energy resolution limits the sensitivity of the experiment to the New Phys ics searches. The upgrade is aimed at the significant\, more than 2 times\ , improvement of the energy resolution\, along with the 70% increase of th e sensitive volume. The talk will cover the details of the production and testing of the new scintillation counters for the sensitive volume\, the a nticipated changes in the DAQ system\, the projected energy and coordinate resolution from the MC simulation\, as well as the status and the schedul e of the upgrade works.\n\nhttps://indico.particle.mephi.ru/event/626/cont ributions/6510/ LOCATION:Sevastopol Hotel URL:https://indico.particle.mephi.ru/event/626/contributions/6510/ END:VEVENT BEGIN:VEVENT SUMMARY:Current Status and Future Prospects of PandaX DTSTART;VALUE=DATE-TIME:20261029T133500Z DTEND;VALUE=DATE-TIME:20261029T135000Z DTSTAMP;VALUE=DATE-TIME:20261022T065853Z UID:indico-contribution-317-6364@cern.ch DESCRIPTION:Speakers: Wei Wang (Sun Yat-sen University)\nThe PandaX experi ment at the China Jinping Underground Laboratory (CJPL) uses large-scale l iquid-xenon time projection chambers to search for dark matter and other r are physical processes. PandaX-4T\, with a multi-tonne xenon target\, has accumulated extensive science data and established competitive constraints on WIMP dark matter\, while significantly extending its physics program t oward light dark matter\, exotic dark-sector interactions\, solar neutrino s\, and double-beta decay. In this talk\, I will present an overview of th e current status and recent physics results of PandaX-4T\, highlighting th e broad discovery potential enabled by its low-background environment and wide energy coverage. I will also discuss the future PandaX program. Build ing on the experience of PandaX-4T\, the collaboration is preparing for th e PandaX-40T phase\, which will substantially increase the xenon target ma ss and further improve sensitivity to dark matter interactions toward the neutrino-fog regime. At the same time\, the enlarged detector will provide powerful opportunities for neutrino physics and searches for other rare p rocesses\, establishing PandaX as a general-purpose underground observator y for particle physics and astrophysics.\n\nhttps://indico.particle.mephi. ru/event/626/contributions/6364/ LOCATION:Sevastopol Hotel URL:https://indico.particle.mephi.ru/event/626/contributions/6364/ END:VEVENT BEGIN:VEVENT SUMMARY:COHERENT status and results DTSTART;VALUE=DATE-TIME:20261029T132000Z DTEND;VALUE=DATE-TIME:20261029T133500Z DTSTAMP;VALUE=DATE-TIME:20261022T065853Z UID:indico-contribution-317-6241@cern.ch DESCRIPTION:Speakers: Vladimir Belov (ITEP and MEPhI)\nThe COHERENT collab oration is devoted to study of the Coherent Elastic\nNeutrino-Nucleus Scat tering (CEνNS) using the high-quality pion-decay-at-rest neutrino\nsource at the Spallation Neutron Source located in the Oak Ridge National Labora tory.\nThe CEvNS process is predicted in the Standard Model and it dominat es in low-energy\nneutrinos interactions with matter. Its measurement prov ides a Standard Model test and\nis important for supernova explosion studi es as well as for prediction of the background\nfloor for dark matter dire ct detection.\nThe COHERENT effort is a broad program of diverse experimen ts related to CEvNS\nstudies including neutrino cross-sections measurement s\, nuclear recoil quenching factor\nevaluations and neutrino flux measure ment. Several detectors of various types are\ninstalled at SNS to cover a broad range of nuclei. The most prominent detectors are:\nCsI[Na]\, liquid Ar\, NaI[Tl]\, HPGe\, D2O. The CEvNS signal was clearly observed in\nseve ral detectors\, the results agree well with the SM prediction. This talk p rovides an\noverview of the actual program\, current results and future pr ospects for the\nCOHERENT.\n\nhttps://indico.particle.mephi.ru/event/626/c ontributions/6241/ LOCATION:Sevastopol Hotel URL:https://indico.particle.mephi.ru/event/626/contributions/6241/ END:VEVENT BEGIN:VEVENT SUMMARY:Precision studies of neutron decay and the left-right asymmetric m odel of weak interaction DTSTART;VALUE=DATE-TIME:20261029T145500Z DTEND;VALUE=DATE-TIME:20261029T151000Z DTSTAMP;VALUE=DATE-TIME:20261022T065853Z UID:indico-contribution-317-6242@cern.ch DESCRIPTION:Speakers: Anatolii Serebrov (NRC "Kurchatov Institute" - PNPI) \nAn analysis of the most recent\, most precise experimental data on neutr on decay points to the need to extend the Standard Model by introducing an admixture of the right-handed vector boson $W_R$. A left-right asymmetric weak interaction model is presented\, in which the sign of the mixing ang le of $W_R$ and $W_L$ reverses upon the transition from $W^-$ to $W^+$. In this model\, CP violation arises due to the presence of an admixture of t he right-handed vector boson. The model parameter\, the mixing angle $\\ze ta = -(2.7 \\pm 0.9) \\cdot 10^{-3}$\, is derived from neutron decay — t he lifetime and decay asymmetries — as well as from studies of proton de cay in nuclei\, the so-called superallowed $0^+$-$0^+$ transitions. The $W _R$: mass $M_{W_R} = (340 \\pm 60)$ GeV estimate is given by the relation from the parameter $\\delta = -(5.5\\pm1.8) \\cdot 10^{-2}$\, which is the ratio of the squares of the mass states of vector bosons. It is shown tha t within the framework of this model\, the effects of CP violation in the decays of $K^0$-mesons\, $D^0$-mesons\, $B^0$-mesons\, and $B^0_S$-mesons can be successfully described.\n\nhttps://indico.particle.mephi.ru/event/ 626/contributions/6242/ LOCATION:Sevastopol Hotel URL:https://indico.particle.mephi.ru/event/626/contributions/6242/ END:VEVENT BEGIN:VEVENT SUMMARY:Search for antineutrino capture on 72Ge nuclei with 72mGa in the f inal state DTSTART;VALUE=DATE-TIME:20261029T140500Z DTEND;VALUE=DATE-TIME:20261029T142000Z DTSTAMP;VALUE=DATE-TIME:20261022T065853Z UID:indico-contribution-317-6243@cern.ch DESCRIPTION:Speakers: Daniil Sautner (Lebedev Physics Institute\, Moscow I nstitute of Physics and Technology )\nWe present the results of the first search of reactor antineutrino capture on $^{72}$Ge with the metastable $^ {72m}$Ga ($T_{1/2}$ = 39.7 ms\, $E_{γ}$ = 119.7 keV) in the final state. The search is performed based on ~800 kg·days of data acquired by the νG eN 1.41-kg germanium spectrometer at the Kalinin nuclear power plant. An u pper limit on exclusive $^{72}$Ge($\\bar{ν}$\, $e^+$)$^{72m}$Ga cross sec tion is evaluated.\n\nhttps://indico.particle.mephi.ru/event/626/contribut ions/6243/ LOCATION:Sevastopol Hotel URL:https://indico.particle.mephi.ru/event/626/contributions/6243/ END:VEVENT BEGIN:VEVENT SUMMARY:CE$\\nu$AS processes in He-II: Beyond the model of ideal BEC DTSTART;VALUE=DATE-TIME:20261029T144000Z DTEND;VALUE=DATE-TIME:20261029T145500Z DTSTAMP;VALUE=DATE-TIME:20261022T065853Z UID:indico-contribution-317-6245@cern.ch DESCRIPTION:Speakers: Konstantin Kouzakov (Lomonosov Moscow State Universi ty)\nSuperfluid helium-4 (He-II) is being considered as a detector materia l for light dark matter searches [1\,2] and the observation of coherent el astic neutrino-atom scattering (CE$\\nu$AS) [3]. It has extreme intrinsic radiopurity\, high impedance to external vibration noise\, and a unique qu antum evaporation signal channel enabling the detection of phonon- and rot onlike modes via liberation of He-4 atoms into a vacuum. Detecting the lib erated atoms using atomic adsorption onto a calorimeter suspended in vacuu m above the free surface of the target He-II\, in principle\, can make it possible to measure unprecedentedly low recoil energies (on a meV scale). \n\nIn this contribution we address the issue of the He-II response to low -energy elastic neutrino-atom scattering. Specifically\, we focus on how t he effects of the real medium alter the atomic recoil spectra calculated i n the simplified model of ideal Bose-Einstein condensate (BEC) for He-II. We present calculations for scattering of tritium electron antineutrinos o n atoms in He-II\, which case is relevant to the SArov Tritium-Ultra-Rich Neutrino Experiment (SATURNE) [4] that aims at the first ever observation of CE$\\nu$AS and the search of neutrino magnetic moment with a world-lead ing sensitivity. We show that taking into account the realistic atomic mom entum distribution in He-II [5] leads to quantitative and qualitative diff erences with respect to the ideal BEC model. We outline the risks to misin terpret the future SATURNE data as a signal of new physics\, in particular \, such as the neutrino magnetic moment\, if ignoring the effects of the r eal He-II medium.\n \n[1] S. A. Hertel\, A. Biekert\, J. Lin\, V. Velan\, and D. N. McKinsey\, Phys. Rev. D **100**\, 092007 (2019)\n\n[2] B. von Kr osigk et al.\, SciPost Phys. Proc. **12**\, 016 (2023)\n\n[3] M. Cadeddu\, F. Dordei\, C. Giunti\, K. A. Kouzakov\, E. Picciau\, and A. I. Studeniki n\, Phys. Rev. D **100**\, 073014 (2019)\n\n[4] K. A. Kouzakov\, I. S. Ste pantsov\, and A. I. Studenikin\, Phys. Atom. Nucl. **88**\, 275 (2025)\n\n [5] P.E. Sokol and W.M. Snow\, in *Excitations in Two-Dimensional and Thre e-Dimensional Quantum Fluids*\, ed. by A.G.F. Wyatt and H.J. Lauter (Plenu m Press\, New York\, 1991)\, p. 47\n\nhttps://indico.particle.mephi.ru/eve nt/626/contributions/6245/ LOCATION:Sevastopol Hotel URL:https://indico.particle.mephi.ru/event/626/contributions/6245/ END:VEVENT BEGIN:VEVENT SUMMARY:Current status of the νGeN experiment aimed at studying propertie s of reactor antineutrinos. DTSTART;VALUE=DATE-TIME:20261029T135000Z DTEND;VALUE=DATE-TIME:20261029T140500Z DTSTAMP;VALUE=DATE-TIME:20261022T065853Z UID:indico-contribution-317-6246@cern.ch DESCRIPTION:Speakers: Dmitrii Ponomarev (DLNP JINR)\nThe νGeN experiment is aimed to study reactor antineutrinos properties at Kalinin Nuclear Powe r Plant in Udomlya. The experimental setup is located at about 11 meters u nder 3.1 GWth reactor which is leading to an antineutrino flux of (3.9-4.4 )*10$^{13}$ cm$^{-2}$ s$^{-1}$. To detect antineutrinos the low-background 1.4 kg HPGe detector with energy threshold less than 300 eV is used. Such a threshold and high antineutrino flux gives a possibility to detect cohe rent elastic scattering of reactor antineutrinos on Ge nuclei in the fully coherence regime as well as search for the anomalous neutrino electromagn etic properties. The current status of the measurement and the planned upg rade of the setup will be presented.\n\nhttps://indico.particle.mephi.ru/e vent/626/contributions/6246/ LOCATION:Sevastopol Hotel URL:https://indico.particle.mephi.ru/event/626/contributions/6246/ END:VEVENT BEGIN:VEVENT SUMMARY:Baryon and lepton asymmetry of the Universe in the left-right asym metric model of weak interaction DTSTART;VALUE=DATE-TIME:20261029T151000Z DTEND;VALUE=DATE-TIME:20261029T152500Z DTSTAMP;VALUE=DATE-TIME:20261022T065853Z UID:indico-contribution-317-6247@cern.ch DESCRIPTION:Speakers: Anatolii Serebrov (NRC "Kurchatov Institute" - PNPI) \nThe formation of the Universe's baryon and lepton asymmetries is examine d within the framework of a left-right asymmetric model of weak interactio n. The presence of a right-handed vector boson admixture—with mixing ang les of opposite signs for $W^-$ and $W^+$—results in differing lifetimes for neutrons and antineutrons\, which decay via $W^-$ and $W^+$\, respect ively. This difference gives rise to baryon asymmetry during the hadroniza tion of quark-gluon plasma at temperatures below 150 MeV. The formation of lepton asymmetry in the left-right model is linked to the presence of ste rile (right-handed) neutrinos\; these do not thermalize and instead escape the cosmic plasma\, carrying away a lepton asymmetry that is opposite in sign to the baryon asymmetry. Overall\, a baryon-lepton asymmetry emerges while the difference between baryon and lepton numbers ($B-L$) is conserve d. The potential for enhancing the experimental precision of neutron decay asymmetry measurements is noted as a means to increase the confidence lev el in substantiating the left-right asymmetric model of weak interaction.\ n\nhttps://indico.particle.mephi.ru/event/626/contributions/6247/ LOCATION:Sevastopol Hotel URL:https://indico.particle.mephi.ru/event/626/contributions/6247/ END:VEVENT BEGIN:VEVENT SUMMARY:Accurate antineutrino spectra from fission fragments of 235U\,238U \,239Pu\,241Pu DTSTART;VALUE=DATE-TIME:20261028T135000Z DTEND;VALUE=DATE-TIME:20261028T140500Z DTSTAMP;VALUE=DATE-TIME:20261022T065853Z UID:indico-contribution-317-6236@cern.ch DESCRIPTION:Speakers: Valery Sinev (Institute for Nuclear Research RAS)\nM ost accurate antineutrino spectra from fission fragments of nuclear fuel f issile isotopes 235U\,238U\,239Pu\,241Pu were obtained. These spectra were calculated when fitting experimental antineutrino spectrum by the calcula ted ones. As a result\, high statistics experimental spectrum was describe d with the calculated one. New antineutrino spectra can predict inverse be ta-decay cross section in reactor antineutrino flux with an accuracy of ab out 1%.\n\nhttps://indico.particle.mephi.ru/event/626/contributions/6236/ LOCATION:Sevastopol Hotel URL:https://indico.particle.mephi.ru/event/626/contributions/6236/ END:VEVENT BEGIN:VEVENT SUMMARY:Study of Reactor Antineutrino Spectral Characteristics and Fuel Ev olution of a VVER-1000 Reactor with the iDREAM Detector at the Kalinin Nuc lear Power Plant DTSTART;VALUE=DATE-TIME:20261028T133500Z DTEND;VALUE=DATE-TIME:20261028T135000Z DTSTAMP;VALUE=DATE-TIME:20261022T065853Z UID:indico-contribution-317-6237@cern.ch DESCRIPTION:Speakers: Ivan Zhutikov (MEPhI/NRC KI)\nWe present measurement s of the integral and spectral characteristics of the reactor electron ant ineutrino ($\\bar{\\nu}_e$) flux obtained with the iDREAM detector at Unit 3 of the Kalinin Nuclear Power Plant\, which operates a VVER-1000 reactor . The measured positron spectrum from $\\bar{\\nu}_e$ interactions with pr otons in the iDREAM liquid scintillator is compared with a prediction base d on the isotope-dependent $\\bar{\\nu}_e$ spectra of the KI model\, a spa tial model of the VVER-1000 reactor core\, and a Monte Carlo simulation of the detector response. In the energy range of approximately $4$--$6~\\mat hrm{MeV}$\, a local excess of the measured spectrum over the prediction is observed\, confirming the presence of the reactor $\\bar{\\nu}_e$ spectra l anomaly. The iDREAM data also confirm a decrease in the inverse beta-dec ay interaction rate normalized to the reactor thermal power as $^{235}\\ma thrm{U}$ is depleted and $^{239}\\mathrm{Pu}$ accumulates in the reactor c ore during fuel burnup. Using the measured $\\bar{\\nu}_e$ interaction rat e\, the evolution of the $^{235}\\mathrm{U}$ and $^{239}\\mathrm{Pu}$ fiss ion fractions is reconstructed while the contributions from $^{238}\\mathr m{U}$ and $^{241}\\mathrm{Pu}$ are kept fixed. These results are further u sed to obtain a model-dependent estimate of the relative change in the $^{ 239}\\mathrm{Pu}$ mass in the reactor core over the course of the fuel cyc le.\n\nhttps://indico.particle.mephi.ru/event/626/contributions/6237/ LOCATION:Sevastopol Hotel URL:https://indico.particle.mephi.ru/event/626/contributions/6237/ END:VEVENT BEGIN:VEVENT SUMMARY:Effect of MOX Fuel Loading on the Antineutrino Emission of the BN- 800 Fast Reactor DTSTART;VALUE=DATE-TIME:20261028T140500Z DTEND;VALUE=DATE-TIME:20261028T142000Z DTSTAMP;VALUE=DATE-TIME:20261022T065853Z UID:indico-contribution-317-6238@cern.ch DESCRIPTION:Speakers: Valerie Vakulenko ()\nFor the first time\, the elect ron-antineutrino flux and energy spectrum of the BN-800 fast reactor are s tudied during fuel burnup for different core loading configurations. Three core configurations containing 16%\, 50%\, and 100% mixed-oxide (MOX) fue l are considered.The study of antineutrino emission from fast reactors wit h different fuel compositions is of interest both for understanding the fo rmation of the reactor antineutrino signal and for developing non-invasive monitoring methods. An approximately 198-effective-day fuel cycle at a no minal thermal power of 2100 MW is simulated using the KIR-C software packa ge. The calculated fission and neutron-capture reaction rates are used to study changes in the isotopic composition of the antineutrino signal\, the integral flux\, and the energy spectrum during fuel burnup. Increasing th e MOX fuel fraction leads to a substantial redistribution of the fission c ontributions of uranium and plutonium isotopes\; for the full-MOX core\, a pproximately 82% of all fissions occur in 239Pu. The antineutrino flux and the shape of the energy spectrum depend on the core composition\, while t he differences relative to the VVER-1000 increase with increasing MOX fuel fraction. At the same time\, the time evolution of the BN-800 antineutrin o spectrum remains weak for all three configurations: changes in the spect ral characteristics over the considered fuel cycle do not exceed a few per cent.\n\nhttps://indico.particle.mephi.ru/event/626/contributions/6238/ LOCATION:Sevastopol Hotel URL:https://indico.particle.mephi.ru/event/626/contributions/6238/ END:VEVENT BEGIN:VEVENT SUMMARY:Results from the stage one of the DANSS experiment DTSTART;VALUE=DATE-TIME:20261028T130500Z DTEND;VALUE=DATE-TIME:20261028T132000Z DTSTAMP;VALUE=DATE-TIME:20261022T065853Z UID:indico-contribution-317-6239@cern.ch DESCRIPTION:Speakers: Nataliya Skrobova ()\nThe DANSS reactor antineutrino spectrometer is located in close proximity to the power reactor of the Ka lininskaya NPP (Russia). A lifting platform allows the detector position t o be changed in the range of 11–13 m from the reactor core. More than 10 M neutrino events and the long-term experiment operation\, covering 5 com plete fuel campaigns\, provide DANSS with rich experimental data\, which i s used for both fundamental and applied studies. Our results include:\nthe most stringent limit for sterile neutrinos at $\\Delta m^2$∼1 eV$^2$\,\ nnew limits for Large Extra Dimensions\,\na precise measurement of the 235 U to 239Pu neutrino yield ratio\,\nthe first precise monitoring of an indu strial reactor’s power and fission fractions.\n\nhttps://indico.particle .mephi.ru/event/626/contributions/6239/ LOCATION:Sevastopol Hotel URL:https://indico.particle.mephi.ru/event/626/contributions/6239/ END:VEVENT BEGIN:VEVENT SUMMARY:Observing of reactor antineutrino signal in the TAO detector DTSTART;VALUE=DATE-TIME:20261028T125000Z DTEND;VALUE=DATE-TIME:20261028T130500Z DTSTAMP;VALUE=DATE-TIME:20261022T065853Z UID:indico-contribution-317-6240@cern.ch DESCRIPTION:Speakers: Peter Rudakov (MSU)\nThe Taishan Antineutrino Observ atory (TAO)\, a satellite experiment of the JUNO project\, is located at a short baseline from one of the reactor cores of the Taishan Nuclear Power Plant. Its primary objective is to achieve a high-statistics and high-ene rgy resolution measurement of the reactor antineutrino energy spectrum. Th e detector contains a ton-scale liquid scintillator doped with gadolinium and operated at approximately −50 °C. Silicon photomultipliers provide a high-coverage light collection\, enabling an energy resolution of about 2.8 % at 1 MeV. Data from the initial physics runs are analysed using a de dicated calibration programme and event reconstruction techniques\, which allow precise characterisation of the detector’s energy response. Invers e beta decay candidates are identified via the prompt–delayed coincidenc e signature\, while residual backgrounds are constrained using reactor-off data. A statistically significant reactor-correlated antineutrino signal is observed\, and the measured prompt energy spectrum is consistent with t he reference prediction within the current uncertainties. These results co nfirm the excellent performance of the TAO detector and provide a referenc e spectrum for the JUNO experiment\, facilitate studies of fine spectral s tructures\, and enable searches for light sterile neutrinos.\n\nhttps://in dico.particle.mephi.ru/event/626/contributions/6240/ LOCATION:Sevastopol Hotel URL:https://indico.particle.mephi.ru/event/626/contributions/6240/ END:VEVENT BEGIN:VEVENT SUMMARY:Pion and muon identification in charged-current muon-neutrino inte raction in the upgraded near detector of the T2K Experiment DTSTART;VALUE=DATE-TIME:20261028T060000Z DTEND;VALUE=DATE-TIME:20261028T061500Z DTSTAMP;VALUE=DATE-TIME:20261022T065853Z UID:indico-contribution-317-6228@cern.ch DESCRIPTION:Speakers: Alexandr Shvartsman (INR RAS)\nThe upgraded near neu trino detector of the T2K experiment is briefly described. The central par t is the 3D scintillator fine-grained detector (SuperFGD). The detector co mprised of about 2 million 1 × 1 × 1 cm3 plastic scintillator cubes with three orthogonal holes for wavelength shifting fiber readout. It is used as an active neutrino target to detect charged particles and photons. A co mbination of SuperFGD with the other subdetector systems in the ND280 dete ctor provides a possibility to detect more neutrino events (due to an addi tional active target)\, as well as to increase the accuracy of the neutrin o events reconstruction.\n \nIn charged-current muon-neutrino analysis\, t he outgoing muon is selected to reconstruct the neutrino energy. In SuperF GD\, however\, pions can be misidentified as muons\, complicating this sel ection. This work uses a Graph Neural Network (GNN) to identify muons and pions. We present the efficiency and purity of the GNN-based classificatio n of these particles and discuss its impact on event selections. The resul ts are based on Monte Carlo simulations of neutrino interactions in the up graded ND280 detector.\n \n \n1. K. Abe et al. (T2K Collaboration)\, The T 2K experiment\, Nucl. Instrum. Meth. A 659 (2011) 106-135\, DOI: 10.1016/j .nima.2011.06.067 \n \n2. Yu. Kudenko et al. (T2K Collaboration)\, The n ear neutrino detector of the T2K experiment\, Nucl. Instrum. Meth. A 598 ( 2009) 289-295\, DOI: 10.1016/j.nima.2008.08.029 \n \n3. Abe S. et al.\, The super fine-grained detector for the T2K neutrino oscillation experimen t. Nucl.Instrum.Meth.A 1092 (2026) 171882\n \n4. Abe K. [et al.]. T2K ND2 80 Upgrade – Technical Design Report\, JINST 6. 2011. P12004 [arXiv:1901 .03750 ] Jan. 11 2019\, 196 p.\n \n5. Shlomi\, J.\, Battaglia\, P.\, & Vli mant\, J.-R. "Graph neural networks in particle physics." Machine Learning : Science and Technology 2.2 (2021): 021001.\n\nhttps://indico.particle.me phi.ru/event/626/contributions/6228/ LOCATION:Sevastopol Hotel URL:https://indico.particle.mephi.ru/event/626/contributions/6228/ END:VEVENT BEGIN:VEVENT SUMMARY:Search for Heavy Neutral Leptons with T2K Near Detector ND280 DTSTART;VALUE=DATE-TIME:20261028T061500Z DTEND;VALUE=DATE-TIME:20261028T063000Z DTSTAMP;VALUE=DATE-TIME:20261022T065853Z UID:indico-contribution-317-6229@cern.ch DESCRIPTION:Speakers: Konstantin Gorshanov (The Institute for Nuclear Rese arch of the Russian Academy of Sciences)\nCurrent work aims at the study o f heavy neutral leptons\, or heavy neutrinos (N)\, in the mass range $\n\n https://indico.particle.mephi.ru/event/626/contributions/6229/ LOCATION:Sevastopol Hotel URL:https://indico.particle.mephi.ru/event/626/contributions/6229/ END:VEVENT BEGIN:VEVENT SUMMARY:Test of the GENIE neutrino event generator against reduced cross s ections extracted from 16O(e\, e′p) data DTSTART;VALUE=DATE-TIME:20261028T071500Z DTEND;VALUE=DATE-TIME:20261028T073000Z DTSTAMP;VALUE=DATE-TIME:20261022T065853Z UID:indico-contribution-317-6230@cern.ch DESCRIPTION:Speakers: Stanislav Luchuk (INR)\nThe accuracy of extracted ne utrino oscillation parameters in accelerator-based neutrino experiments de pends on the precision of neutrino-nucleus scattering models implemented i n neutrino event generators. The goal of this study is to asses the accura cy of the GENIE event generator with electron scattering data. To do this we carry out a comparison of the charged-current quasielastic CCQE reduced cross sections of the semi-exclusive (l\,l'p) lepton scattering process c alculated within the models employed in the GENIE event generator with dat a measured in electron scattering on oxygen targets. This comparison is ba sed on the similarity of the reduced cross sections of neutrino and electr on scattering up to Coulomb corrections. Irrespective of the type of inter action the reduced cross section identified with distorted nuclear spectra l functions is determined mainly by intrinsic properties of the target and the ejected nucleon interaction with residual nucleus. This study include s GENIE's main models and Tokyo\, NIKHEF electron data sets in energy rang e 0.3 GeV - 0.5 GeV. Persistent disagreements between the GENIE prediction s and electron scattering data for reduced cross sections is observed.\n\n https://indico.particle.mephi.ru/event/626/contributions/6230/ LOCATION:Sevastopol Hotel URL:https://indico.particle.mephi.ru/event/626/contributions/6230/ END:VEVENT BEGIN:VEVENT SUMMARY:On estimates of the masses and mixing parameters of active and ste rile neutrinos DTSTART;VALUE=DATE-TIME:20261028T073000Z DTEND;VALUE=DATE-TIME:20261028T074500Z DTSTAMP;VALUE=DATE-TIME:20261022T065853Z UID:indico-contribution-317-6231@cern.ch DESCRIPTION:Speakers: Viacheslav Khruschov (NRC Kurchatov Institute)\nAn a nalysis of available experimental and observational data as well as some t heoretical assumptions related to the masses and mixing angles and mixing phases of active and sterile neutrinos was conducted. Based on these exper imental and theoretical results and the analysis\, estimates of the masses and mixing parameters of active and sterile neutrinos were obtained. Thes e estimates can be used in calculating the characteristics of neutrino pro cesses.\nAt transition to models generalizing the Standard Model (especial ly with sterile neutrinos [1\, 2]) the theory will depend on new constants \, which will be in relations with the SM constants. The presence of such relations will indicate possible paths for further development of the theo ry [3]. Moreover the estimates of the masses and mixing parameters present ed in this paper may have practical significance for the interpretation of neutrino experimental data.\n1. V.V. Khruschov\, S.V. Fomichev\, O.A. Tit ov\, Physics of Atomic Nuclei 79\, 708 (2016). \n2. A V . Yudin D K . Nady ozhin\, V.V. Khruschov\, S.V. Fomichev\, Astron. Lett. 42\, 800 (2016).\n3 . A.V. Borisov and A.P. Isaev\, Phys. Part. Nuclei 55\, 634 (2024).\n \nО б оценках значений масс и параметров сме шивания активных и стерильных нейтрино\n Проведѐн анализ имеющихся эксперимента льных результатов и наблюдательных данн ых\, а также некоторых теоретических пре дположений\, относящихся к значениям мас с\, углов и фаз смешивания активных и сте рильных нейтрино. На основе эксперимент альных и теоретических результатов с уч етом проведенного анализа получены оцен ки значений масс и параметров смешивани я активных и стерильных нейтрино. Эти оц енки могут быть использованы при вычисл ениях характеристик нейтринных процесс ов.\nПри переходе к моделям\, обобщающим С тандартную модель (особенно со стерильн ыми нейтрино [1\, 2])\, теория будет зависет ь от новых констант\, которые будут связа ны с константами СМ. Присутствие таких с оотношений будет указывать возможные пу ти дальнейшего развития теории [3]. Более того\, оценки масс и параметров смешиван ия\, приведенные в этой работе\, могут име ть практическое значение для интерпрета ции нейтринных экспериментальных данны х.\n\nhttps://indico.particle.mephi.ru/event/626/contributions/6231/ LOCATION:Sevastopol Hotel URL:https://indico.particle.mephi.ru/event/626/contributions/6231/ END:VEVENT BEGIN:VEVENT SUMMARY:Radiative corrections and effects of new physics in deep inelastic neutrino scattering DTSTART;VALUE=DATE-TIME:20261028T074500Z DTEND;VALUE=DATE-TIME:20261028T080000Z DTSTAMP;VALUE=DATE-TIME:20261022T065853Z UID:indico-contribution-317-6232@cern.ch DESCRIPTION:Speakers: Elena Kovalevskaia (MSU\, Faculty of Physics)\nRapid technological advances pave the way for high-precision experiments\, part icularly in neutrino physics. Such enhanced precision offers new opportuni ties to search for new physics — physics beyond the Standard Model (BSM) . In this context\, neutrino scattering on matter is of particular interes t\, as it incorporates information regarding both the neutrino itself and the target matter.\n\nFrom this perspective\, deep inelastic neutrino scat tering possesses a number of key advantages. The interest in neutrino scat tering specifically stems from recent scientific discoveries indicating th at neutrinos should have electromagnetic properties\, which\, in turn\, ex plicitly point to BSM physics. However\, at this level of precision\, elec troweak radiative corrections must also be taken into account.\nThe presen t study is devoted to the theoretical analysis of high-energy neutrino-mat ter scattering processes\, taking into account the electromagnetic and wea k properties of neutrinos alongside one-loop contributions\, as well as to evaluating their impact on the interpretation of experimental data.\n\nWi thin the framework of quantum field theory\, one-loop electroweak radiativ e corrections to the neutrino-matter scattering cross-section formula were calculated\, incorporating the electromagnetic properties of neutrinos vi a the theoretical formalism of the form-factor decomposition of the vertex function. In addition\, the parameterization of neutrino form factors mod ifying neutral currents was performed. Finally\, it is demonstrated how th ese effects alter the differential scattering cross sections with respect to momentum transfer.\n\nhttps://indico.particle.mephi.ru/event/626/contri butions/6232/ LOCATION:Sevastopol Hotel URL:https://indico.particle.mephi.ru/event/626/contributions/6232/ END:VEVENT BEGIN:VEVENT SUMMARY:First Analysis of Muon Neutrino Interactions in the SuperFGD DTSTART;VALUE=DATE-TIME:20261028T070000Z DTEND;VALUE=DATE-TIME:20261028T071500Z DTSTAMP;VALUE=DATE-TIME:20261022T065853Z UID:indico-contribution-317-6233@cern.ch DESCRIPTION:Speakers: Daria Fedorova (INR RAS\, MIPT)\nThe Tokai-to-Kamiok a (T2K) experiment is a long-baseline neutrino oscillation experiment in J apan. T2K is designed to precisely measure neutrino oscillation parameters and search for CP violation in the lepton sector using an intense muon (a nti)neutrino beam. Measurements with the near detector\, ND280\, are essen tial for constraining neutrino interaction models and the initial neutrino flux\, thereby reducing systematic uncertainties in the oscillation analy sis. In 2024\, ND280 was upgraded with the novel 3D-segmented SuperFGD det ector at its core. This work presents the first analysis of muon neutrino interactions in the SuperFGD detector. The results establish the foundatio n for incorporating the upgraded ND280 into the T2K oscillation analysis\, improving its overall precision and laying the groundwork for the next-ge neration Hyper-Kamiokande experiment at the J-PARC beamline.\n\nhttps://in dico.particle.mephi.ru/event/626/contributions/6233/ LOCATION:Sevastopol Hotel URL:https://indico.particle.mephi.ru/event/626/contributions/6233/ END:VEVENT BEGIN:VEVENT SUMMARY:Probing Pion-Nucleon and Proton-Nucleon Production Channels for Mi llicharged Particles in the SuperFGD Detector at T2K DTSTART;VALUE=DATE-TIME:20261028T063000Z DTEND;VALUE=DATE-TIME:20261028T064500Z DTSTAMP;VALUE=DATE-TIME:20261022T065853Z UID:indico-contribution-317-6234@cern.ch DESCRIPTION:Speakers: Nikita Mashin ()\nThe T2K experiment uses a high-int ensity muon neutrino beam produced at the J-PARC accelerator facility to s tudy neutrino properties and search for physics beyond the Standard Model. Recently\, the near detector ND280 was upgraded with a high-performance s cintillator detector\, the SuperFGD. Composed of approximately 2 million 1 cm³ scintillator cubes read out by wavelength-shifting (WLS) fibers in t hree dimensions\, the SuperFGD enables improved 3D tracking of stopping pr otons and pions\, enhanced electron/photon separation\, and neutron detect ion. This makes the SuperFGD sensitive to feebly interacting exotic partic les. In this study\, we investigate the potential of the detector to obser ve millicharged particles (mCPs) with masses up to several GeV\, as predic ted by various hidden-sector models.\n\nPrevious studies have primarily fo cused on mCP production from neutral unflavoured mesons\, while this work extends the production model to include additional hadronic channels. We e valuate the contribution of mCPs generated through charged pion-nucleon sc attering and elastic proton-neutron scattering within the target material. These production mechanisms may constitute a non-negligible source of mCP s at T2K energies. Using realistic performance characteristics of the Supe rFGD\, we estimate the expected signal rates for the topology of double co nsecutive scatterings of mCPs on atomic electrons. The study will provide an assessment of how pion-nucleon and proton-neutron processes extend the detector's sensitivity in the (mass\, millicharge) parameter space.\n\nhtt ps://indico.particle.mephi.ru/event/626/contributions/6234/ LOCATION:Sevastopol Hotel URL:https://indico.particle.mephi.ru/event/626/contributions/6234/ END:VEVENT BEGIN:VEVENT SUMMARY:TPC Particle Identification Performance and Systematic Uncertainti es in the T2K Near Detector Before and After the Upgrade DTSTART;VALUE=DATE-TIME:20261028T064500Z DTEND;VALUE=DATE-TIME:20261028T070000Z DTSTAMP;VALUE=DATE-TIME:20261022T065853Z UID:indico-contribution-317-6235@cern.ch DESCRIPTION:Speakers: Anna Dergacheva (INR RAS)\nT2K (Tokai-to-Kamioka) [1 ] is a long-baseline accelerator experiment aimed at studying neutrino osc illations and searching for CP violation in the lepton sector. Reducing sy stematic uncertainties in the predicted event rates at the far detector Su per-Kamiokande is essential for improving T2K’s sensitivity to the CP-vi olating phase. The ND280 near detector plays a key role in this task by co nstraining neutrino flux and interaction model parameters using pre-oscill ation data. The time projection chambers (TPCs) [2] provide key informatio n for particle identification (PID) and the reconstruction of charged part icle kinematics in ND280. The ND280 upgrade [3] introduced two high-angle TPCs (HA-TPCs)\, which\, together with the three existing vertical TPCs\, provide an extended angular acceptance for charged particles. \n\nThe TPC PID algorithm [4] is based on measurements of the ionization energy loss o f charged particles traversing the TPC gas. The performance of the algor ithm and associated systematic uncertainties are evaluated using control s amples of muons\, protons\, and electrons produced in neutrino interaction s. The work focuses on the studies of the TPC PID before and after the ND2 80 upgrade\, as well as on the impact of the results and evaluated systema tics on muon-candidate selection using the ND280 near detector data. This work is supported by Russian Science Foundation grant No. 26-72-00042.\n\n [1] K. Abe et al. (T2K Collab.). Constraint on the matter-antimatter symme try-violating phase in neutrino oscillations\, Nature 580 (2020) 339–344 . \n\n[2] N. Abgrall et al. (T2K ND280 TPC Collab.). Time Projection Cha mbers for the T2K Near Detectors\, Nucl. Instrum. Meth. A 637 (2011) 25– 46.\n\n[3] K. Abe et al. (T2K Collab.). T2K ND280 Upgrade — Technical De sign Report\, arXiv:1901.03750 [physics.ins-det] (2019).\n\n[4] A. Dergach eva and A. Izmaylov. Evaluation of uncertainties associated with particle identification in the time projection chambers of the ND280 near detector of the T2K experiment\, Physics of Atomic Nuclei 89\, 4 (2026).\n\nhttps:/ /indico.particle.mephi.ru/event/626/contributions/6235/ LOCATION:Sevastopol Hotel URL:https://indico.particle.mephi.ru/event/626/contributions/6235/ END:VEVENT END:VCALENDAR