2022, Polyarush, A. Y., Akimenko, S. A., Artamonov, A. V., Bychkov, V. N., Gorin, A. M., Gushchin, E. N., Donskov, S. V., Duk, V. A., Zalikhanov, B. Z., Inyakin, A. V., Kekelidze, G. D., Kolosov, V. N., Kravtsov, V. I., Kudenko, Y. G., Куденко, Юрий Григорьевич

The T-odd correlation ξπeγ, which is the mixed product of the momenta of e+, π0, and γ in the system of rest of the kaon divided by MK3, has been measured in the K+ → π0e+νeγ radiative decay among 101 200 candidate events detected at the OKA setup. The asymmetry of the distribution in ξπeγ is characterized by the ratio (Formula presented.), where N+ (-) is the number of events with positive (negative) ξ. The value Aξ = (+0.1 ± 3.9(stat.) ± 1.7(syst.)) × 10–3 or |Aξ| andlt; 5.4 × 10-3 (90% C.L.) has been obtained. © 2022, Pleiades Publishing, Inc.

2019, Abe, K., Akutsu, R., Ali, A., Andreopoulos, C., Kudenko, Y., Куденко, Юрий Григорьевич

© 2019 The Author(s).We report a measurement of the flux-integrated νμ charged-current cross sections on water, hydrocarbon, and iron in the T2K on-axis neutrino beam with a mean neutrino energy of 1.5 GeV. The measured cross sections on water, hydrocarbon, and iron are σH2oCC = (0.840±0.010(stat.)+0.10-0.08(syst.)) ×10-38 cm2/nucleon, σCHCC = (0.817±0.007(stat.)+0.11-0.08(syst.)) × 10-38 cm2/nucleon, and σFeCC = (0.859±0.003(stat.)

2025, Dergacheva, A., Chernov, D., Chvirova, A. A., Erofeev, G., Kudenko,Y., Naumov, P., Куденко, Юрий Григорьевич, Наумов, Петр Юрьевич

2022, Dolan, S., Nguyen, V. Q., Blanchet, A., Bolognesi, S., Kudenko, Y., Куденко, Юрий Григорьевич

© 2022 authors. Published by the American Physical Society.published article's title, journal citation, and DOI. Funded by SCOAP3.The most challenging and impactful uncertainties that future accelerator-based measurements of neutrino oscillations must overcome stem from our limited ability to model few-GeV neutrino-nucleus interactions. In particular, it is crucial to better understand the nuclear effects which can alter the final state topology and kinematics of neutrino interactions, inducing possible biases in neutrino energy reconstruction. The upgraded ND280 near detector of the T2K experiment will directly confront neutrino interaction uncertainties using a new suite of detectors with full polar angle acceptance, improved spatial resolutions, neutron detection capabilities and reduced tracking thresholds. In this manuscript we explore the physics sensitivity that can be expected from the upgraded detector, specifically focusing on the additional sensitivity to nuclear effects and how they can be constrained with future measurements of kinematic variables constructed using both outgoing lepton and nucleon kinematics.

2021, Polyarush, A. Y., Akimenko, S. A., Artamonov, A. V., Blik, A. M., Kudenko, Y. G., Куденко, Юрий Григорьевич

© 2021, The Author(s).Results of a study of the K+→ πe+νγ decay at OKA setup are presented. More than 32,000 events of this decay are observed. The differential spectra over the photon energy and the photon–electron opening angle in kaon rest frame are presented. The branching ratios, normalized to that of Ke3 decay are calculated for different cuts on Eγ∗ and cosΘeγ∗. In particular, the branching ratio for Eγ∗>30 MeV and Θeγ∗>20∘ is measured R = Br(K+→π0e+νeγ)Br(K+→π0e+νe) = = (0.587±0.010(stat.)±0.015(syst.))× 10 - 2, which is in a good agreement with ChPT O(p4) calculations.

2021, Abe, K., Akhlaq, N., Akutsu, R., Ali, A., Kudenko, Y., Куденко, Юрий Григорьевич

We report measurements of the flux-integrated (nu) over bar (mu) and (nu) over bar (mu) + nu(mu) charged-current cross -sections on water and hydrocarbon targets using the T2K anti-neutrino beam with a mean beam energy of 0.86 GeV. The signal is defined as the (anti -)neutrino charged-current interaction with one induced mu(+/-) and no detected charged pion or proton. These measurements are performed using a new WAGASCI module recently added to the T2K setup in combination with the INGRID Proton Module. The phase space of muons is restricted to the high-detection efficiency region, p(mu) > 400 MeV/c and theta(mu) < 30 degrees, in the laboratory frame. An absence of pions and protons in the detectable phase spaces of p(pi) > 200 MeV/c, theta(pi) < 70 degrees and p(p) > 600 MeV/c, theta(p) < 70 degrees is required. In this paper, both the <(nu)over bar>(mu), cross-sections and (nu) over bar (mu) + nu(mu), cross-sections on water and hydrocarbon targets and their ratios are provided by using the D'Agostini unfolding method. The results of the integrated (nu) over bar (mu), cross-section measurements over this phase space are sigma(H2O) = (1.082 +/- 0.068(stat.)(+0.145)(-0.128)(syst.)) x 10(-39) cm(2)/nucleon, sigma(CH) = (1.096 +/- 0.054 (stat.)(+0.132)(-0.117)(syst.)) x 10(-39) cm(2) /nucleon, and sigma(H2O)/sigma(CH) = 0.987 +/- 0.078 (stat.)(+0.093)(-0.090)(syst.). The (nu) over bar (mu), + nu(mu), cross-section is sigma(H2O) = (1.155 +/- 0.064(stat.)(+0.148)(-0.129)(syst.)) x 10(-39) cm(2)/nucleon, sigma(CH) = (1.159 +/- 0.049(stat.)(+0.129)(-0.115)(syst.)) x 10(-39) cm(2)/nucleon, and sigma(H2O)/sigma(CH) = 0.996 +/- 0.069(stat.)(+0.083)(-0.078)(syst.).

2024, Artamonov, A. V., Bychkov, V. N., Donskov, S. V., Filin, A. P., Kudenko, Y., Куденко, Юрий Григорьевич

2025, Abe, S., Alekseev, I., Arai, T., Kudenko, Y., Куденко, Юрий Григорьевич

2022, Ahdida, C., Akmete, A., Albanese, R., Alt, J., Atkin, E., Dmitrenko, V., Etenko, A., Fillipov, K., Grachev, V., Kudenko, Y., Polukhina, N., Samsonov, V., Shustov, A., Skorokhvatov, M., Smirnov, S., Teterin, P., Ulin, S., Uteshev, Z., Vlasik, K., Аткин, Эдуард Викторович, Дмитренко, Валерий Васильевич, Этенко, Александр Владимирович, Грачев, Виктор Михайлович, Куденко, Юрий Григорьевич, Полухина, Наталья Геннадьевна, Шустов, Александр Евгеньевич, Скорохватов, Михаил Дмитриевич, Смирнов, Сергей Юрьевич, Тетерин, Пётр Евгеньевич, Улин, Сергей Евгеньевич, Утешев, Зияэтдин Мухамедович, Власик, Константин Федорович

© 2022, The Author(s).The Search for Hidden Particles (SHiP) Collaboration has proposed a general-purpose experimental facility operating in beam-dump mode at the CERN SPS accelerator to search for light, feebly interacting particles. In the baseline configuration, the SHiP experiment incorporates two complementary detectors. The upstream detector is designed for recoil signatures of light dark matter (LDM) scattering and for neutrino physics, in particular with tau neutrinos. It consists of a spectrometer magnet housing a layered detector system with high-density LDM/neutrino target plates, emulsion-film technology and electronic high-precision tracking. The total detector target mass amounts to about eight tonnes. The downstream detector system aims at measuring visible decays of feebly interacting particles to both fully reconstructed final states and to partially reconstructed final states with neutrinos, in a nearly background-free environment. The detector consists of a 50m long decay volume under vacuum followed by a spectrometer and particle identification system with a rectangular acceptance of 5 m in width and 10 m in height. Using the high-intensity beam of 400GeV protons, the experiment aims at profiting from the 4 × 10 19 protons per year that are currently unexploited at the SPS, over a period of 5–10 years. This allows probing dark photons, dark scalars and pseudo-scalars, and heavy neutral leptons with GeV-scale masses in the direct searches at sensitivities that largely exceed those of existing and projected experiments. The sensitivity to light dark matter through scattering reaches well below the dark matter relic density limits in the range from a few MeV/c2 up to 100 MeV-scale masses, and it will be possible to study tau neutrino interactions with unprecedented statistics. This paper describes the SHiP experiment baseline setup and the detector systems, together with performance results from prototypes in test beams, as it was prepared for the 2020 Update of the European Strategy for Particle Physics. The expected detector performance from simulation is summarised at the end.

2022, Dergacheva, A., Khotjantsev, A., Kudenko, Y., Mefodiev, A., Куденко, Юрий Григорьевич

This paper describes the instrumental aspects of the novel fully active 3D fine-grained scintillator detector SuperFGD as a main part of the Near off-axis Detector Upgrade Program of the T2K experiment. © 2022 Elsevier B.V.