Персона: Куденко, Юрий Григорьевич
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Институт ядерной физики и технологий
Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.
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Куденко
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Юрий Григорьевич
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Теперь показываю 1 - 10 из 14
- ПубликацияОткрытый доступFirst search for K+ -> pi(+) nu(nu)over-bar using the decay-in-flight technique(2019) Gil, E. Cortina; Minucci, E.; Padolski, S.; Petrov, P.; Kudenko, Y.; Shaikhiev, A.; Куденко, Юрий ГригорьевичThe NA62 experiment at the CERN SPS reports the first search for K+ -> pi(+) nu(nu) over bar using the decay-in-flight technique, based on a sample of 1.21 x10(11) K+ decays collected in 2016. The single event sensitivity is 3.15 x10(-10), corresponding to 0.267 Standard Model events. One signal candidate is observed while the expected background is 0.152 events. This leads to an upper limit of 14 x10(-10) on the K+ -> pi(+) nu(nu) over bar branching ratio at 95% CL. (c) 2019 The Author. Published by Elsevier B.V.
- ПубликацияТолько метаданныеSearches for lepton number violating K+ decays(2019) Gil, E. C.; Kleimenova, A.; Minucci, E.; Padolski, S.; Kudenko, Y.; Куденко, Юрий ГригорьевичThe NA62 experiment at CERN reports a search for the lepton number violating decays K+ -> pi(-)e(+)e(+) and K+ -> pi(-)mu(+)mu(+) using a data sample collected in 2017. No signals are observed, and upper limits on the branching fractions of these decays of 2.2 x 10(-10) and 4.2 x 10(-11) are obtained, respectively, at 90% confidence level. These upper limits improve on previously reported measurements by factors of 3 and 2, respectively. (C) 2019 The Author. Published by Elsevier B.V.
- ПубликацияОткрытый доступBeam test results of 3D fine-grained scintillator detector prototype for a T2K ND280 neutrino active target(2019) Mineev, O.; Blondel, A.; Favre, Y.; Fedotov, S.; Kudenko, Y.; Куденко, Юрий Григорьевич© 2019 Elsevier B.V. An upgrade of the long baseline neutrino experiment T2K ND280 near detector is under development with the goal to reduce systematic uncertainties in the prediction of number of events at the Super-Kamiokande far detector. The upgrade program includes the design and construction of a new neutrino target, a novel highly granular fully active scintillator detector with 3D WLS fiber readout. The ∼2 tonnes 192 × 192 × 56 cm3 detector will be assembled from 2 × 106 plastic scintillator cubes of 1 × 1 × 1 cm3 size. Each cube is read out by three orthogonal Kuraray Y11 WLS fibers threaded through the detector. A detector prototype made of 125 cubes was assembled and tested in a charged particle beam at CERN in October 2017. This paper presents results from studies of light yield, time resolution and optical cross-talk between the cubes.
- ПубликацияОткрытый доступThe experimental facility for the Search for Hidden Particles at the CERN SPS(2019) Ahdida, C.; Albanese, R.; Alexandrov, A.; Anokhina, A.; Atkin, E.; Dmitrenko, V.; Etenko, A.; Filippov, K.; Gavrilov, G.; Grachev, V.; Kudenko, Y.; Novikov, A.; 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 ФедоровичThe Search for Hidden Particles (SHiP) Collaboration has shown that the CERN SPS accelerator with its 400 GeV/c proton beam offers a unique opportunity to explore the Hidden Sector [1-3]. The proposed experiment is an intensity frontier experiment which is capable of searching for hidden particles through both visible decays and through scattering signatures from recoil of electrons or nuclei. The high-intensity experimental facility developed by the SHiP Collaboration is based on a number of key features and developments which provide the possibility of probing a large part of the parameter space for a wide range of models with light long-lived super-weakly interacting particles with masses up to O(10) GeV/c(2) in an environment of extremely clean background conditions. This paper describes the proposal for the experimental facility together with the most important feasibility studies. The paper focuses on the challenging new ideas behind the beam extraction and beam delivery, the proton beam dump, and the suppression of beam-induced background.
- ПубликацияОткрытый доступStudy of the decay K+ -> pi(+)pi(-)pi(+)gamma in the OKA experiment(2019) Shapkin, M. M.; Akimenko, S. A.; Artamonov, A. V.; Blik, A. M.; Kudenko, Yu. G.; Куденко, Юрий ГригорьевичA high statistics data sample of the decays of K+ mesons to three charged particles was accumulated by the OKA experiment in 2012 and 2013. This allowed to select a clean sample of about 450 events with K+ -> pi(+)pi(-)pi(+)gamma decays with the energy of the photon in the kaon rest frame greater than 30 MeV. The measured branching fraction of the K+ -> pi(+)pi(-)pi(+)gamma, with MeV is equal to (0.71 +/- 0.05)x10-5. The measured differential branching fraction over photon energy is compared with the prediction of the chiral perturbation theory to O(p4). A search for an up-down asymmetry of the photon with respect to the hadronic system decay plane is also performed.
- ПубликацияОткрытый доступSensitivity of the SHiP experiment to Heavy Neutral Leptons(2019) Ahdida, C.; Albanese, R.; Alexandrov, A.; Anokhina, A.; Atkin, E.; Dmitrenko, V.; Etenko, A.; Filippov, K.; Gavrilov, G.; Grachev, V.; Kudenko, Y.; Novikov, A.; 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 ФедоровичHeavy Neutral Leptons (HNLs) are hypothetical particles predicted by many extensions of the Standard Model. These particles can, among other things, explain the origin of neutrino masses, generate the observed matter-antimatter asymmetry in the Universe and provide a dark matter candidate. The SHiP experiment will be able to search for HNLs produced in decays of heavy mesons and travelling distances ranging between O(50 m) and tens of kilometers before decaying. We present the sensitivity of the SHiP experiment to a number of HNL's benchmark models and provide a way to calculate the SHiP's sensitivity to HNLs for arbitrary patterns of flavour mixings. The corresponding tools and data files are also made publicly available.
- ПубликацияТолько метаданныеSearch for production of an invisible dark photon in (0) decays(2019) Gil, E. Cortina.; Kleimenova, A.; Minucci, E.; Padolski, S.; Kudenko, Y.; Куденко, Юрий ГригорьевичThe results of a search for (0) decays to a photon and an invisible massive dark photon at the NA62 experiment at the CERN SPS are reported. From a total of 4.12 x 10(8) tagged (0) mesons, no signal is observed. Assuming a kinetic-mixing interaction, limits are set on the dark photon coupling to the ordinary photon as a function of the dark photon mass, improving on previous searches in the mass range 60-110 MeV/c(2). The present results are interpreted in terms of an upper limit of the branching ratio of the electro-weak decay 0improving the current limit by more than three orders of magnitude.
- ПубликацияТолько метаданныеMeasurement of the K+→ μ+νμγ decay form factors in the OKA experiment(2019) Kravtsov, V. I.; Akimenko, S. A.; Artamonov, A. V.; Blik, A. M.; Kudenko, Y. G.; Куденко, Юрий Григорьевич© 2019, The Author(s).A precise measurement of the vector and axial-vector form factors difference FV- FA in the K+→ μ+νμγ decay is presented. About 95K events of K+→ μ+νμγ are selected in the OKA experiment. The result is FV- FA= 0.134 ± 0.021 (stat) ± 0.027 (syst). Both errors are smaller than in the previous FV- FA measurements.
- ПубликацияТолько метаданныеSearch for light sterile neutrinos with the T2K far detector Super-Kamiokande at a baseline of 295 km(2019) Abe, K.; Akutsu, R.; Ali, A.; Andreopoulos, C.; Kudenko, Y.; Куденко, Юрий ГригорьевичWe perform a search for light sterile neutrinos using the data from the T2K far detector at a baseline of 295 km, with an exposure of 14.7(7.6) x 10(20) protons on target in neutrino (antineutrino) mode. A selection of neutral-current interaction samples is also used to enhance the sensitivity to sterile mixing. No evidence of sterile neutrino mixing in the 3 + 1 model was found from a simultaneous fit to the charged-current muon, electron and neutral-current neutrino samples. We set the most stringent limit on the sterile oscillation amplitude sin(2)theta(24 )for the sterile neutrino mass splitting Delta m(41)(2 )< 3 x 10(-3 )eV(2)/c(4).
- ПубликацияТолько метаданныеMeasurement of neutrino and antineutrino neutral-current quasielasticlike interactions on oxygen by detecting nuclear deexcitation gamma rays(2019) Abe, K.; Akutsu, R.; Ali, A.; Alt, C.; Kudenko, Y.; Куденко, Юрий ГригорьевичNeutrino- and antineutrino-oxygen neutral-current quasielasticlike interactions are measured at Super-Kamiokande using nuclear deexcitation gamma rays to identify signal-like interactions in data from a 14.94(16.35) x 10(20) protons-on-target exposure of the T2K neutrino (antineutrino) beam. The measured flux-averaged cross sections on oxygen nuclei are = 1.70 +/- 0.17(stat.)(-0.38)(+0.51) (syst.) x 10(-38) cm(2)/oxygen with a flux-averaged energy of 0.82 GeV and = 0.98 +/- 0.16(stat.)(-0.19)(+0.26)(syst.) x 10(-38)cm(2)/oxygen with a flux-averaged energy of 0.68 GeV, for neutrinos and antineutrinos, respectively. These results are the most precise to date, and the antineutrino result is the first cross section measurement of this channel. They are compared with various theoretical predictions. The impact on evaluation of backgrounds to searches for supernova relic neutrinos at present and future water Cherenkov detectors is also discussed.