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1. Measurements of neutrino oscillation parameters from the T2K experiment using 3.6×1021 protons on target

Author

Abe, K, Akhlaq, N, Akutsu, R, Ali, A, Alonso Monsalve, S, Alt, C, Andreopoulos, C, Antonova, M, Aoki, S, Arihara, T, Asada, Y, Ashida, Y, Atkin, ET, Barbi, M, Barker, GJ, Barr, G, Barrow, D, Batkiewicz-Kwasniak, M, Bench, F, Berardi, V, Berns, L, Bhadra, S, Blanchet, A, Blondel, A, Bolognesi, S, Bonus, T, Bordoni, S, Boyd, SB, Bravar, A, Bronner, C, Bron, S, Bubak, A, Buizza Avanzini, M, Caballero, JA, Calabria, NF, Cao, S, Carabadjac, D, Carter, AJ, Cartwright, SL, Catanesi, MG, Cervera, A, Chakrani, J, Cherdack, D, Chong, PS, Christodoulou, G, Chvirova, A, Cicerchia, M, Coleman, J, Collazuol, G, Cook, L, Cudd, A, Dalmazzone, C, Daret, T, Davydov, Yu I, De Roeck, A, De Rosa, G, Dealtry, T, Delogu, CC, Densham, C, Dergacheva, A, Di Lodovico, F, Dolan, S, Douqa, D, Doyle, TA, Drapier, O, Dumarchez, J, Dunne, P, Dygnarowicz, K, Eguchi, A, Emery-Schrenk, S, Erofeev, G, Ershova, A, Eurin, G, Fedorova, D, Fedotov, S, Feltre, M, Finch, AJ, Fiorentini Aguirre, GA, Fiorillo, G, Fitton, MD, Franco Patiño, JM, Friend, M, Fujii, Y, Fukuda, Y, Fusshoeller, K, Giannessi, L, Giganti, C, Glagolev, V, Gonin, M, González Rosa, J, Goodman, EAG, Gorin, A, Grassi, M, Guigue, M, Hadley, DR, Haigh, JT, Hamacher-Baumann, P, Harris, DA, Hartz, M, and Hasegawa, T

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, T2K Collaboration, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract

The T2K experiment presents new measurements of neutrino oscillation parameters using 19.7(16.3)×1020 protons on target (POT) in (anti-)neutrino mode at the far detector (FD). Compared to the previous analysis, an additional 4.7×1020 POT neutrino data was collected at the FD. Significant improvements were made to the analysis methodology, with the near-detector analysis introducing new selections and using more than double the data. Additionally, this is the first T2K oscillation analysis to use NA61/SHINE data on a replica of the T2K target to tune the neutrino flux model, and the neutrino interaction model was improved to include new nuclear effects and calculations. Frequentist and Bayesian analyses are presented, including results on sin2θ13 and the impact of priors on the δCP measurement. Both analyses prefer the normal mass ordering and upper octant of sin2θ23 with a nearly maximally CP-violating phase. Assuming the normal ordering and using the constraint on sin2θ13 from reactors, sin2θ23=0.561-0.032+0.021 using Feldman-Cousins corrected intervals, and Δm322=2.494-0.058+0.041×10-3eV2 using constant Δχ2 intervals. The CP-violating phase is constrained to δCP=-1.97-0.70+0.97 using Feldman-Cousins corrected intervals, and δCP=0,π is excluded at more than 90% confidence level. A Jarlskog invariant of zero is excluded at more than 2σ credible level using a flat prior in δCP, and just below 2σ using a flat prior in sinδCP. When the external constraint on sin2θ13 is removed, sin2θ13=28.0-6.5+2.8×10-3, in agreement with measurements from reactor experiments. These results are consistent with previous T2K analyses.

Published
2023

2. Supernova Model Discrimination with Hyper-Kamiokande

Author

Collaboration, Hyper-Kamiokande, :, Abe, K, Adrich, P, Aihara, H, Akutsu, R, Alekseev, I, Ali, A, Ameli, F, Anghel, I, Anthony, LHV, Antonova, M, Araya, A, Asaoka, Y, Ashida, Y, Aushev, V, Ballester, F, Bandac, I, Barbi, M, Barker, GJ, Barr, G, Batkiewicz-Kwasniak, M, Bellato, M, Berardi, V, Bergevin, M, Bernard, L, Bernardini, E, Berns, L, Bhadra, S, Bian, J, Blanchet, A, Blaszczyk, FDM, Blondel, A, Boiano, A, Bolognesi, S, Bonavera, L, Booth, N, Borjabad, S, Boschi, T, Bose, D, Boyd, SB, Bozza, C, Bravar, A, Bravo-Berguño, D, Bronner, C, Brown, L, Bubak, A, Buchowicz, A, Avanzini, M Buizza, Cafagna, FS, Calabria, NF, Calvo-Mozota, JM, Cao, S, Cartwright, SL, Carroll, A, Catanesi, MG, Cebriàn, S, Chabera, M, Chakraborty, S, Checchia, C, Choi, JH, Choubey, S, Cicerchia, M, Coleman, J, Collazuol, G, Cook, L, Cowan, G, Cuen-Rochin, S, Danilov, M, Lopez, G Daz, De la Fuente, E, de Perio, P, De Rosa, G, Dealtry, T, Densham, CJ, Dergacheva, A, Deshmukh, N, Devi, MM, Di Lodovico, F, Di Meo, P, Di Palma, I, Doyle, TA, Drakopoulou, E, Drapier, O, Dumarchez, J, Dunne, P, Dziewiecki, M, Eklund, L, Hedri, S El, Ellis, J, Emery, S, Esmaili, A, Esteve, R, Evangelisti, A, Feely, M, Fedotov, S, Feng, J, Fernandez, P, Fernández-Martinez, E, and Ferrario, P

Subjects
astro-ph.IM, astro-ph.HE, hep-ex, physics.ins-det
Abstract

Core-collapse supernovae are among the most magnificent events in theobservable universe. They produce many of the chemical elements necessary forlife to exist and their remnants -- neutron stars and black holes -- areinteresting astrophysical objects in their own right. However, despitemillennia of observations and almost a century of astrophysical study, theexplosion mechanism of core-collapse supernovae is not yet well understood.Hyper-Kamiokande is a next-generation neutrino detector that will be able toobserve the neutrino flux from the next galactic core-collapse supernova inunprecedented detail. We focus on the first 500 ms of the neutrino burst,corresponding to the accretion phase, and use a newly-developed, high-precisionsupernova event generator to simulate Hyper-Kamiokande's response to fivedifferent supernova models. We show that Hyper-Kamiokande will be able todistinguish between these models with high accuracy for a supernova at adistance of up to 100 kpc. Once the next galactic supernova happens, thisability will be a powerful tool for guiding simulations towards a precisereproduction of the explosion mechanism observed in nature.

Published
2021

3. Neutron-antineutron oscillation search using a 0.37 megaton-years exposure of Super-Kamiokande

Author

Abe, K, Bronner, C, Hayato, Y, Ikeda, M, Imaizumi, S, Ito, H, Kameda, J, Kataoka, Y, Miura, M, Moriyama, S, Nagao, Y, Nakahata, M, Nakajima, Y, Nakayama, S, Okada, T, Okamoto, K, Orii, A, Pronost, G, Sekiya, H, Shiozawa, M, Sonoda, Y, Suzuki, Y, Takeda, A, Takemoto, Y, Takenaka, A, Tanaka, H, Yano, T, Akutsu, R, Han, S, Kajita, T, Okumura, K, Tashiro, T, Wang, R, Xia, J, Bravo-Berguño, D, Labarga, L, Marti, Ll, Zaldivar, B, Blaszczyk, FDM, Kearns, E, Gustafson, JD, Raaf, JL, Stone, JL, Wan, L, Wester, T, Bian, J, Griskevich, NJ, Kropp, WR, Locke, S, Mine, S, Smy, MB, Sobel, HW, Takhistov, V, Weatherly, P, Hill, J, Kim, JY, Lim, IT, Park, RG, Bodur, B, Scholberg, K, Walter, CW, Coffani, A, Drapier, O, Hedri, S El, Giampaolo, A, Gonin, M, Mueller, Th A, Paganini, P, Quilain, B, Ishizuka, T, Nakamura, T, Jang, JS, Learned, JG, Anthony, LHV, Sztuc, AA, Uchida, Y, Berardi, V, Catanesi, MG, Radicioni, E, Calabria, NF, Machado, LN, De Rosa, G, Collazuol, G, Iacob, F, Lamoureux, M, Ospina, N, Ludovici, L, Nishimura, Y, Cao, S, Friend, M, Hasegawa, T, Ishida, T, Kobayashi, T, Matsubara, T, Nakadaira, T, Jakkapu, M, Nakamura, K, Oyama, Y, Sakashita, K, and Sekiguchi, T

Subjects
Nuclear and Plasma Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract

As a baryon number violating process with ΔB=2, neutron-antineutron oscillation (n→n¯) provides a unique test of baryon number conservation. We have performed a search for n→n¯ oscillation with bound neutrons in Super-Kamiokande, with the full dataset from its first four run periods, representing an exposure of 0.37 Mton-years. The search used a multivariate analysis trained on simulated n→n¯ events and atmospheric neutrino backgrounds and resulted in 11 candidate events with an expected background of 9.3 events. In the absence of statistically significant excess, we derived a lower limit on n¯ appearance lifetime in O16 nuclei of 3.6×1032 years and on the neutron-antineutron oscillation time of τn→n¯>4.7×108 s at 90% C.L.

Published
2021

4. Search for proton decay via p→e+π0 and p→μ+π0 with an enlarged fiducial volume in Super-Kamiokande I-IV

Author

Takenaka, A, Abe, K, Bronner, C, Hayato, Y, Ikeda, M, Imaizumi, S, Ito, H, Kameda, J, Kataoka, Y, Kato, Y, Kishimoto, Y, Marti, Ll, Miura, M, Moriyama, S, Mochizuki, T, Nagao, Y, Nakahata, M, Nakajima, Y, Nakayama, S, Okada, T, Okamoto, K, Orii, A, Pronost, G, Sekiya, H, Shiozawa, M, Sonoda, Y, Suzuki, Y, Takeda, A, Takemoto, Y, Tanaka, H, Yano, T, Akutsu, R, Han, S, Kajita, T, Okumura, K, Tashiro, T, Wang, R, Xia, J, Bravo-Berguño, D, Labarga, L, Fernandez, P, Zaldivar, B, Blaszczyk, FDM, Kearns, E, Raaf, JL, Stone, JL, Wan, L, Wester, T, Pointon, BW, Bian, J, Griskevich, NJ, Kropp, WR, Locke, S, Mine, S, Smy, MB, Sobel, HW, Takhistov, V, Weatherly, P, Ganezer, KS, Hill, J, Kim, JY, Lim, IT, Park, RG, Bodur, B, Scholberg, K, Walter, CW, Coffani, A, Drapier, O, Hedri, S El, Giampaolo, A, Gonin, M, Mueller, Th A, Paganini, P, Quilain, B, Ishizuka, T, Nakamura, T, Jang, JS, Learned, JG, Matsuno, S, Anthony, LHV, Litchfield, RP, Sztuc, AA, Uchida, Y, Berardi, V, Catanesi, MG, Radicioni, E, Calabria, NF, Machado, LN, De Rosa, G, Collazuol, G, Iacob, F, Lamoureux, M, Ospina, N, Ludovici, L, Nishimura, Y, Cao, S, Friend, M, Hasegawa, T, Ishida, T, and Jakkapu, M

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract

We have searched for proton decay via p→e+π0 and p→μ+π0 modes with the enlarged fiducial volume data of Super-Kamiokande from April 1996 to May 2018, which corresponds to 450 kton·years exposure. We have accumulated about 25% more livetime and enlarged the fiducial volume of the Super-Kamiokande detector from 22.5 kton to 27.2 kton for this analysis, so that 144 kton·years of data, including 78 kton·years of additional fiducial volume data, has been newly analyzed. No candidates have been found for p→e+π0 and one candidate remains for p→μ+π0 in the conventional 22.5 kton fiducial volume and it is consistent with the atmospheric neutrino background prediction. We set lower limits on the partial lifetime for each of these modes: τ/B(p→e+π0)>2.4×1034 years and τ/B(p→μ+π0)>1.6×1034 years at 90% confidence level.

Published
2020

5. The Hyper-Kamiokande Experiment -- Snowmass LOI

Author

Collaboration, Hyper-Kamiokande, :, Abe, K, Adrich, P, Aihara, H, Akutsu, R, Alekseev, I, Ali, A, Ameli, F, Anthony, LHV, Araya, A, Asaoka, Y, Aushev, V, Bandac, I, Barbi, M, Barr, G, Batkiewicz-Kwasniak, M, Bellato, M, Berardi, V, Bernard, L, Bernardini, E, Berns, L, Bhadra, S, Bian, J, Blanchet, A, Blondel, A, Boiano, A, Bolognesi, S, Bonavera, L, Borjabad, S, Boschi, T, Bose, D, Boyd, SB, Bozza, C, Bravar, A, Bronner, C, Bubak, A, Buchowicz, A, Avanzini, M Buizza, Cafagna, FS, Calabria, NF, Calvo-Mozota, JM, Cao, S, Catanesi, MG, Chakraborty, S, Choi, JH, Choubey, S, Cicerchia, M, Coleman, J, Collazuol, G, Cuen-Rochin, S, Danilov, M, De la Fuente, E, de Perio, P, De Rosa, G, Dealtry, T, Densham, CJ, Dergacheva, A, Deshmukh, N, Devi, MM, Di Lodovico, F, Di Meo, P, Di Palma, I, Doyle, TA, Drakopoulou, E, Drapier, O, Dumarchez, J, Eklund, L, Hedri, S El, Ellis, J, Emery, S, Esmaili, A, Fedotov, S, Feng, J, Fernández-Martinez, E, Ferrario, P, Ferrazzi, B, Finch, A, Finley, C, Fiorillo, G, Fitton, M, Friend, M, Fujii, Y, Fukuda, Y, Galinski, G, Gao, J, Garde, C, Garfagnini, A, Garode, S, Gialanella, L, Giganti, C, Gomez-Cadenas, JJ, Gonin, M, González-Nuevo, J, Gorin, A, Gornea, R, Gramegna, F, Grassi, M, Grella, G, and Guigue, M

Subjects
physics.ins-det, hep-ex
Abstract

Hyper-Kamiokande is the next generation underground water Cherenkov detectorthat builds on the highly successful Super-Kamiokande experiment. The detectorwhich has an 8.4~times larger effective volume than its predecessor will belocated along the T2K neutrino beamline and utilize an upgraded J-PARC beamwith 2.6~times beam power. Hyper-K's low energy threshold combined with thevery large fiducial volume make the detector unique, that is expected toacquire an unprecedented exposure of 3.8~Mton$\cdot$year over a period of20~years of operation. Hyper-Kamiokande combines an extremely diverse scienceprogram including nucleon decays, long-baseline neutrino oscillations,atmospheric neutrinos, and neutrinos from astrophysical origins. The scientificscope of this program is highly complementary to liquid-argon detectors forexample in sensitivity to nucleon decay channels or supernova detection modes.Hyper-Kamiokande construction has started in early 2020 and the experiment isexpected to start operations in 2027. The Hyper-Kamiokande collaboration ispresently being formed amongst groups from 19 countries including the UnitedStates, whose community has a long history of making significant contributionsto the neutrino physics program in Japan. US physicists have played leadingroles in the Kamiokande, Super-Kamiokande, EGADS, K2K, and T2K programs.

Published
2020

6. Search for proton decay into three charged leptons in 0.37 megaton-years exposure of the Super-Kamiokande

Author

Tanaka, M, Abe, K, Bronner, C, Hayato, Y, Ikeda, M, Imaizumi, S, Ito, H, Kameda, J, Kataoka, Y, Kato, Y, Kishimoto, Y, Marti, Ll, Miura, M, Moriyama, S, Mochizuki, T, Nakahata, M, Nakajima, Y, Nakayama, S, Okada, T, Okamoto, K, Orii, A, Pronost, G, Sekiya, H, Shiozawa, M, Sonoda, Y, Takeda, A, Takenaka, A, Tanaka, H, Yano, T, Akutsu, R, Kajita, T, Okumura, K, Wang, R, Xia, J, Bravo-Berguño, D, Labarga, L, Fernandez, P, Blaszczyk, FDM, Kearns, E, Raaf, JL, Stone, JL, Wan, L, Wester, T, Bian, J, Griskevich, NJ, Kropp, WR, Locke, S, Mine, S, Smy, MB, Sobel, HW, Takhistov, V, Weatherly, P, Hill, J, Kim, JY, Lim, IT, Park, RG, Bodur, B, Scholberg, K, Walter, CW, Coffani, A, Drapier, O, Hedri, S El, Gonin, M, Mueller, Th A, Paganini, P, Ishizuka, T, Nakamura, T, Jang, JS, Learned, JG, Matsuno, S, Litchfield, RP, Sztuc, AA, Uchida, Y, Berardi, V, Catanesi, MG, Radicioni, E, Calabria, NF, De Rosa, G, Collazuol, G, Iacob, F, Ludovici, L, Nishimura, Y, Cao, S, Friend, M, Hasegawa, T, Ishida, T, Kobayashi, T, Nakadaira, T, Nakamura, K, Oyama, Y, Sakashita, K, Sekiguchi, T, Tsukamoto, T, Hasegawa, M, Isobe, Y, Miyabe, H, Nakano, Y, Shiozawa, T, Sugimoto, T, and Suzuki, AT

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract

A search for proton decay into three charged leptons has been performed by using 0.37 Mton·years of data collected in Super-Kamiokande. All possible combinations of electrons, muons, and their antiparticles consistent with charge conservation were considered as decay modes. No significant excess of events has been found over the background, and lower limits on the proton lifetime divided by the branching ratio have been obtained. The limits range between 9.2×1033 and 3.4×1034 years at 90% confidence level, improving by more than an order of magnitude upon limits from previous experiments. A first limit has been set for the p→μ-e+e+ mode.

Published
2020

7. Search for Astronomical Neutrinos from Blazar TXS 0506+056 in Super-Kamiokande

Author

Hagiwara, K, Abe, K, Bronner, C, Hayato, Y, Ikeda, M, Ito, H, Kameda, J, Kataoka, Y, Kato, Y, Kishimoto, Y, Marti, Ll, Miura, M, Moriyama, S, Mochizuki, T, Nakahata, M, Nakajima, Y, Nakayama, S, Okada, T, Okamoto, K, Orii, A, Pronost, G, Sekiya, H, Shiozawa, M, Sonoda, Y, Takeda, A, Takenaka, A, Tanaka, H, Yano, T, Akutsu, R, Kajita, T, Okumura, K, Wang, R, Xia, J, Bravo-Berguño, D, Labarga, L, Fernandez, P, Blaszczyk, FDM, Kearns, E, Raaf, JL, Stone, JL, Wan, L, Wester, T, Bian, J, Griskevich, NJ, Kropp, WR, Locke, S, Mine, S, Smy, MB, Sobel, HW, Takhistov, V, Weatherly, P, Ganezer, KS, Hill, J, Kim, JY, Lim, IT, Park, RG, Bodur, B, Scholberg, K, Walter, CW, Coffani, A, Drapier, O, Gonin, M, Mueller, Th A, Paganini, P, Ishizuka, T, Nakamura, T, Jang, JS, Learned, JG, Matsuno, S, Litchfield, RP, Sztuc, AA, Uchida, Y, Berardi, V, Calabria, NF, Catanesi, MG, Radicioni, E, De Rosa, G, Collazuol, G, Iacob, F, Ludovici, L, Nishimura, Y, Cao, S, Friend, M, Hasegawa, T, Ishida, T, Kobayashi, T, Nakadaira, T, Nakamura, K, Oyama, Y, Sakashita, K, Sekiguchi, T, Tsukamoto, T, Hasegawa, M, Isobe, Y, Miyabe, H, Nakano, Y, Shiozawa, T, Sugimoto, T, Suzuki, AT, and Takeuchi, Y

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, astro-ph.HE, Astronomical and Space Sciences, Astronomy & Astrophysics, Astronomical sciences, Space sciences
Abstract

We report a search for astronomical neutrinos in the energy region from several GeV to TeV in the direction of the blazar TXS 0506+056 using the Super-Kamiokande detector following the detection of a 100 TeV neutrinos from the same location by the IceCube collaboration. Using Super-Kamiokande neutrino data across several data samples observed from 1996 April to 2018 February we have searched for both a total excess above known backgrounds across the entire period as well as localized excesses on smaller timescales in that interval. No significant excess nor significant variation in the observed event rate are found in the blazar direction. Upper limits are placed on the electron-and muon-neutrino fluxes at the 90% confidence level as 6.0 × 10-7 and 4.5 × 10-7-9.3 × 10-10 [erg cm-2 s-1], respectively.

Published
2019

8. Sensitivity of Super-Kamiokande with Gadolinium to Low Energy Antineutrinos from Pre-supernova Emission

Author

Simpson, C, Abe, K, Bronner, C, Hayato, Y, Ikeda, M, Ito, H, Iyogi, K, Kameda, J, Kataoka, Y, Kato, Y, Kishimoto, Y, Marti, Ll, Miura, M, Moriyama, S, Mochizuki, T, Nakahata, M, Nakajima, Y, Nakayama, S, Okada, T, Okamoto, K, Orii, A, Pronost, G, Sekiya, H, Shiozawa, M, Sonoda, Y, Takeda, A, Takenaka, A, Tanaka, H, Yano, T, Akutsu, R, Kajita, T, Okumura, K, Wang, R, Xia, J, Bravo-Berguño, D, Labarga, L, Fernandez, P, Blaszczyk, FDM, Kachulis, C, Kearns, E, Raaf, JL, Stone, JL, Wan, L, Wester, T, Sussman, S, Berkman, S, Bian, J, Griskevich, NJ, Kropp, WR, Locke, S, Mine, S, Smy, MB, Sobel, HW, Takhistov, V, Weatherly, P, Ganezer, KS, Hill, J, Kim, JY, Lim, IT, Park, RG, Bodur, B, Scholberg, K, Walter, CW, Coffani, A, Drapier, O, Gonin, M, Imber, J, Mueller, Th A, Paganini, P, Ishizuka, T, Nakamura, T, Jang, JS, Choi, K, Learned, JG, Matsuno, S, Litchfield, RP, Sztuc, AA, Uchida, Y, Wascko, MO, Berardi, V, Calabria, NF, Catanesi, MG, Intonti, RA, Radicioni, E, De Rosa, G, Collazuol, G, Iacob, F, Ludovici, L, Nishimura, Y, Cao, S, Friend, M, Hasegawa, T, Ishida, T, Kobayashi, T, Nakadaira, T, Nakamura, K, Oyama, Y, Sakashita, K, Sekiguchi, T, and Tsukamoto, T

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Neutrino astronomy, Supernova neutrinos, Particle astrophysics, Silicon burning, astro-ph.HE, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics, Astronomical sciences, Particle and high energy physics, Space sciences
Abstract

Supernova detection is a major objective of the Super-Kamiokande (SK) experiment. In the next stage of SK (SK-Gd), gadolinium (Gd) sulfate will be added to the detector, which will improve the ability of the detector to identify neutrons. A core-collapse supernova (CCSN) will be preceded by an increasing flux of neutrinos and antineutrinos, from thermal and weak nuclear processes in the star, over a timescale of hours; some of which may be detected at SK-Gd. This could provide an early warning of an imminent CCSN, hours earlier than the detection of the neutrinos from core collapse. Electron antineutrino detection will rely on inverse beta decay events below the usual analysis energy threshold of SK, so Gd loading is vital to reduce backgrounds while maximizing detection efficiency. Assuming normal neutrino mass ordering, more than 200 events could be detected in the final 12 hr before core collapse for a 15-25 solar mass star at around 200 pc, which is representative of the nearest red supergiant to Earth, α-Ori (Betelgeuse). At a statistical false alarm rate of 1 per century, detection could be up to 10 hr before core collapse, and a pre-supernova star could be detected by SK-Gd up to 600 pc away. A pre-supernova alert could be provided to the astrophysics community following gadolinium loading.

Published
2019

9. Atmospheric neutrino oscillation analysis with improved event reconstruction in Super-Kamiokande IV

Author

Jiang, M, Abe, K, Bronner, C, Hayato, Y, Ikeda, M, Iyogi, K, Kameda, J, Kato, Y, Kishimoto, Y, Marti, LL, Miura, M, Moriyama, S, Mochizuki, T, Nakahata, M, Nakajima, Y, Nakano, Y, Nakayama, S, Okada, T, Okamoto, K, Orii, A, Pronost, G, Sekiya, H, Shiozawa, M, Sonoda, Y, Takeda, A, Takenaka, A, Tanaka, H, Yano, T, Akutsu, R, Kajita, T, Nishimura, Y, Okumura, K, Wang, R, Xia, J, Labarga, L, Fernandez, P, Blaszczyk, FDM, Kachulis, C, Kearns, E, Raaf, JL, Stone, JL, Sussman, S, Berkman, S, Bian, J, Griskevich, NJ, Kropp, WR, Locke, S, Mine, S, Weatherly, P, Smy, MB, Sobel, HW, Takhistov, V, Ganezer, KS, Hill, J, Kim, JY, Lim, IT, Park, RG, Bodur, B, Scholberg, K, Walter, CW, Gonin, M, Imber, J, Mueller, Th A, Ishizuka, T, Nakamura, T, Jang, JS, Choi, K, Learned, JG, Matsuno, S, Litchfield, RP, Uchida, Y, Wascko, MO, Calabria, NF, Catanesi, MG, Intonti, RA, Radicioni, E, De Rosa, G, Ali, A, Collazuol, G, Iacob, F, Ludovici, L, Cao, S, Friend, M, Hasegawa, T, Ishida, T, Kobayashi, T, Nakadaira, T, Nakamura, K, Oyama, Y, Sakashita, K, Sekiguchi, T, Tsukamoto, T, Abe, KE, Hasegawa, M, Isobe, Y, Miyabe, H, Sugimoto, T, Suzuki, AT, Takeuchi, Y, and Ashida, Y

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Mathematical Sciences
Abstract

A new event reconstruction algorithm based on a maximum likelihood method has been developed for Super-Kamiokande. Its improved kinematic and particle identification capabilities enable the analysis of atmospheric neutrino data in a detector volume 32% larger than previous analyses and increase the sensitivity to the neutrino mass hierarchy.Analysis of a 253.9 kton•year exposure of the Super-Kamiokande IV atmospheric neutrino data has yielded a weak preference for the normal hierarchy, disfavoring the inverted hierarchy at 74% assuming oscillations at the best fit of the analysis.

Published
2019

10. Measurement of the neutrino-oxygen neutral-current quasielastic cross section using atmospheric neutrinos at Super-Kamiokande

Author

Wan, L, Abe, K, Bronner, C, Hayato, Y, Ikeda, M, Iyogi, K, Kameda, J, Kato, Y, Kishimoto, Y, Marti, Ll, Miura, M, Moriyama, S, Mochizuki, T, Nakahata, M, Nakajima, Y, Nakano, Y, Nakayama, S, Okada, T, Okamoto, K, Orii, A, Pronost, G, Sekiya, H, Shiozawa, M, Sonoda, Y, Takeda, A, Takenaka, A, Tanaka, H, Yano, T, Akutsu, R, Kajita, T, Nishimura, Y, Okumura, K, Wang, R, Xia, J, Labarga, L, Fernandez, P, Blaszczyk, FDM, Kachulis, C, Kearns, E, Raaf, JL, Stone, JL, Sussman, S, Berkman, S, Bian, J, Griskevich, NJ, Kropp, WR, Locke, S, Mine, S, Weatherly, P, Smy, MB, Sobel, HW, Takhistov, V, Ganezer, KS, Hill, J, Kim, JY, Lim, IT, Park, RG, Bodur, B, Scholberg, K, Walter, CW, Gonin, M, Imber, J, Mueller, Th A, Ishizuka, T, Nakamura, T, Jang, JS, Choi, K, Learned, JG, Matsuno, S, Litchfield, RP, Uchida, Y, Wascko, MO, Calabria, NF, Catanesi, MG, Intonti, RA, Radicioni, E, De Rosa, G, Ali, A, Collazuol, G, Iacob, F, Ludovici, L, Cao, S, Friend, M, Hasegawa, T, Ishida, T, Kobayashi, T, Nakadaira, T, Nakamura, K, Oyama, Y, Sakashita, K, Sekiguchi, T, Tsukamoto, T, Abe, KE, Hasegawa, M, Isobe, Y, Miyabe, H, Sugimoto, T, Suzuki, AT, Takeuchi, Y, and Ashida, Y

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract

Neutral current (NC) interactions of atmospheric neutrinos on oxygen form one of the major backgrounds in the search for supernova relic neutrinos with water-based Cherenkov detectors. The NC channel is dominated by neutrino quasielastic (NCQE) scattering off nucleons inside O16 nuclei. In this paper we report the first measurement of NCQE cross section using atmospheric neutrinos at Super-Kamiokande (SK). The measurement used 2,778 live days of SK-IV data with a fiducial volume of 22.5 kiloton water. Within the visible energy window of 7.5-29.5 MeV, we observed 117 events compared to the expected 71.9 NCQE signal and 53.1 background events. Weighted by the atmospheric neutrino spectrum from 160 MeV to 10 GeV, the flux averaged NCQE cross section is measured to be (1.01±0.17(stat.)-0.30+0.78(sys.))×10-38 cm2.

Published
2019

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Author

Takenaka, A, Takenaka, A, Abe, K, Bronner, C, Hayato, Y, Ikeda, M, Imaizumi, S, Ito, H, Kameda, J, Kataoka, Y, Kato, Y, Kishimoto, Y, Marti, Ll, Miura, M, Moriyama, S, Mochizuki, T, Nagao, Y, Nakahata, M, Nakajima, Y, Nakayama, S, Okada, T, Okamoto, K, Orii, A, Pronost, G, Sekiya, H, Shiozawa, M, Sonoda, Y, Suzuki, Y, Takeda, A, Takemoto, Y, Tanaka, H, Yano, T, Akutsu, R, Han, S, Kajita, T, Okumura, K, Tashiro, T, Wang, R, Xia, J, Bravo-Berguño, D, Labarga, L, Fernandez, P, Zaldivar, B, Blaszczyk, FDM, Kearns, E, Raaf, JL, Stone, JL, Wan, L, Wester, T, Pointon, BW, Bian, J, Griskevich, NJ, Kropp, WR, Locke, S, Mine, S, Smy, MB, Sobel, HW, Takhistov, V, Weatherly, P, Ganezer, KS, Hill, J, Kim, JY, Lim, IT, Park, RG, Bodur, B, Scholberg, K, Walter, CW, Coffani, A, Drapier, O, Hedri, S El, Giampaolo, A, Gonin, M, Mueller, Th A, Paganini, P, Quilain, B, Ishizuka, T, Nakamura, T, Jang, JS, Learned, JG, Matsuno, S, Anthony, LHV, Litchfield, RP, Sztuc, AA, Uchida, Y, Berardi, V, Catanesi, MG, Radicioni, E, Calabria, NF, Machado, LN, De Rosa, G, Collazuol, G, Iacob, F, Lamoureux, M, Ospina, N, Ludovici, L, Nishimura, Y, Cao, S, Friend, M, Hasegawa, T, Ishida, T, Jakkapu, M, Takenaka, A, Takenaka, A, Abe, K, Bronner, C, Hayato, Y, Ikeda, M, Imaizumi, S, Ito, H, Kameda, J, Kataoka, Y, Kato, Y, Kishimoto, Y, Marti, Ll, Miura, M, Moriyama, S, Mochizuki, T, Nagao, Y, Nakahata, M, Nakajima, Y, Nakayama, S, Okada, T, Okamoto, K, Orii, A, Pronost, G, Sekiya, H, Shiozawa, M, Sonoda, Y, Suzuki, Y, Takeda, A, Takemoto, Y, Tanaka, H, Yano, T, Akutsu, R, Han, S, Kajita, T, Okumura, K, Tashiro, T, Wang, R, Xia, J, Bravo-Berguño, D, Labarga, L, Fernandez, P, Zaldivar, B, Blaszczyk, FDM, Kearns, E, Raaf, JL, Stone, JL, Wan, L, Wester, T, Pointon, BW, Bian, J, Griskevich, NJ, Kropp, WR, Locke, S, Mine, S, Smy, MB, Sobel, HW, Takhistov, V, Weatherly, P, Ganezer, KS, Hill, J, Kim, JY, Lim, IT, Park, RG, Bodur, B, Scholberg, K, Walter, CW, Coffani, A, Drapier, O, Hedri, S El, Giampaolo, A, Gonin, M, Mueller, Th A, Paganini, P, Quilain, B, Ishizuka, T, Nakamura, T, Jang, JS, Learned, JG, Matsuno, S, Anthony, LHV, Litchfield, RP, Sztuc, AA, Uchida, Y, Berardi, V, Catanesi, MG, Radicioni, E, Calabria, NF, Machado, LN, De Rosa, G, Collazuol, G, Iacob, F, Lamoureux, M, Ospina, N, Ludovici, L, Nishimura, Y, Cao, S, Friend, M, Hasegawa, T, Ishida, T, and Jakkapu, M

Published
2020

12. J-PARC Neutrino Beamline Upgrade Technical Design Report

Author

Abe, K, Aihara, H, Ajmi, A, Alt, C, Andreopoulos, C, Antonova, M, Aoki, S, Asada, Y, Ashida, Y, Atherton, A, Atkin, E, Ban, S, Barbato, FCT, Barbi, M, Barker, GJ, Barr, G, Batkiewicz, M, Beloshapkin, A, Berardi, V, Berns, L, Bhadra, S, Bian, J, Bienstock, S, Blondel, A, Bolognesi, S, Borg, J, Bourguille, B, Boyd, SB, Brailsford, D, Bravar, A, Bron, S, Bronner, C, Avanzini, MB, Calabria, NF, Calcutt, J, Calland, RG, Calvet, D, Campbell, T, Cao, S, Cartwright, SL, Catanesi, MG, Cervera, A, Chappell, A, Cherdack, D, Chikuma, N, Christodoulou, G, Cicerchia, M, Clifton, A, Cogo, G, Coleman, J, Collazuol, G, Coplowe, D, Cudd, A, Dabrowska, A, Delbart, A, Roeck, AD, Rosa, GD, Dealtry, T, Dell'Acqua, A, Denner, PF, Dennis, SR, Densham, C, Dewhurst, D, Lodovico, FD, Dolan, S, Dokania, N, Doqua, D, Drapier, O, Duffy, KE, Dumarchez, J, Dunne, PJ, Dziewiecki, M, Eklund, L, Emery-Schrenk, S, Fedotov, S, Fernandez, P, Feusels, T, Finch, AJ, Fiorentini, GA, Fiorillo, G, Fitton, M, Friend, M, Fujii, Y, Fujita, R, Fukuda, D, Fukuda, R, Fukuda, Y, Fusshoeller, K, Gendotti, A, Giganti, C, Gizzarelli, F, Gonin, M, Gorin, A, Gramegna, F, Guigue, M, Hadley, DR, Haigh, JT, Hallsjö, S-P, Hamacher-Baumann, P, Hansen, D, Harada, J, Hartz, M, Hasegawa, T, Hastings, NC, Hayato, Y, Hiramoto, A, Hogan, M, Holeczek, J, Iacob, F, Ichikawa, AK, Ikeda, M, Imber, J, Ishida, T, Ishii, T, Ishitsuka, M, Iwai, E, Iwamoto, K, Izmaylov, A, Jamieson, B, Jiang, M, Johnson, S, Jonsson, P, Jung, CK, Kabirnezhad, M, Kaboth, AC, Kajita, T, Kakuno, H, Kameda, J, Kasetti, S, Kataoka, Y, Katori, T, Kearns, E, Khabibullin, M, Khotjantsev, A, Kikawa, T, Kim, H, King, S, Kisiel, J, Knight, A, Knox, A, Kobayashi, T, Koch, L, Konaka, A, Kormos, LL, Korzenev, A, Koshio, Y, Kowalik, K, Kropp, W, Kudenko, Y, Kuribayashi, S, Kurjata, R, Kutter, T, Kuze, M, Labarga, L, Lagoda, J, Lamont, I, Lamoureux, M, Last, D, Laveder, M, Lawe, M, Lindner, T, Liptak, ZJ, Litchfield, RP, Liu, S, Long, KR, Longhin, A, Lopez, JP, Ludovici, L, Lu, X, Lux, T, Magaletti, L, Magro, L, Mahn, K, Malek, M, Manly, S, Marchi, T, Maret, L, Marino, AD, Martin, JF, Martynenko, S, Maruyama, T, Matsubara, T, Matsushita, K, Matveev, V, Mauger, C, Mavrokoridis, K, Mazzucato, E, McCarthy, M, McCauley, N, McFarland, KS, McGrew, C, Mefodiev, A, Metelko, C, Mezzetto, M, Mijakowski, P, Mijakowski, J, Minamino, A, Mineev, O, Mine, S, Missert, A, Miura, M, Bueno, LM, Moriyama, S, Morrison, J, Mueller, TA, Murphy, S, Nagai, Y, Nakadaira, T, Nakahata, M, Nakajima, Y, Nakamura, A, Nakamura, KG, Nakamura, K, Nakayama, S, Nakaya, T, Nakayoshi, K, Nantais, C, Ngoc, TV, Nishikawa, K, Nishimura, Y, Nonnenmacher, T, Nova, F, Novella, P, Nowak, J, Nugent, JC, O'Keeffe, HM, Odagawa, T, Ohta, R, Okamoto, K, Okumura, K, Okusawa, T, Ovsyannikova, T, Owen, RA, Oyama, Y, Palladino, V, Paolone, V, Pari, M, Parker, W, Parsa, S, Pasternak, J, Pastore, C, Pavin, M, Payne, D, Perkin, JD, Pickard, L, Pickering, L, Guerra, ESP, Popov, B, Posiadala-Zezula, M, Poutissou, J-M, Poutissou, R, Pozimski, J, Przewlocki, P, Przybilsk, H, Quilain, B, Radermacher, T, Radicioni, E, Radics, B, Ratoff, PN, Reinherz-Aronis, E, Riccio, C, Rojas, P, Rondio, E, Rossi, B, Roth, S, Rubbia, A, Ruggeri, AC, Ruggles, CA, Rychter, A, Sakashita, K, Sánchez, F, Schloesser, CM, Scholberg, K, Schwehr, J, Scott, M, Seiya, Y, Sekiguchi, T, Sekiya, H, Sgalaberna, D, Shaikina, A, Shah, R, Shaikhiev, A, Shaker, F, Shaw, D, Shiozawa, M, Shirahige, T, Shorrock, W, Smirnov, A, Smy, M, Sobczyk, JT, Sobel, H, Soler, FJP, Southwell, L, Spina, R, Steinmann, J, Stewart, T, Stowell, P, Suvorov, S, Suzuki, A, Suzuki, SY, Suzuki, Y, Swierblewski, J, Szeptycka, M, Szoldos, S, Sztuc, A, Tacik, R, Tada, M, Tajima, M, Takeda, A, Takeuchi, Y, Tanaka, HK, Tanaka, HA, Thompson, LF, Toki, W, Tomura, T, Touramanis, C, Tsui, K, Tsukamoto, T, Tzanov, M, Uchida, MA, Uchida, Y, Vagins, M, Van, NH, Vasseur, G, Viant, T, Vilela, C, Wachala, T, Walter, CW, Wang, Y, Wark, D, Wascko, MO, Weber, A, Wendell, R, Wilkes, RJ, Wilking, MJ, Wilson, JR, Wilson, RJ, Wood, K, Wret, C, Yamada, Y, Yamamoto, K, Yanagisawa, C, Yang, G, Yano, T, Yasutome, K, Yen, S, Yershov, N, Yokoyama, M, Yoshida, T, Yuan, T, Yu, M, Zalewska, A, Zalipska, J, Zambelli, L, Zaremba, K, Ziembicki, M, Zimmerman, ED, Zito, M, Hamada, E, Higashi, N, Hirose, E, Igarashi, Y, Iida, M, Iio, M, Ikeno, M, Kimura, N, Kurosawa, N, Makida, Y, Nakamoto, T, Ogitsu, T, Ohhata, H, Okada, R, Okamura, T, Onaka, M, Sasaki, K, Shimazaki, S, Shoji, M, Sugano, M, Tanaka, K, Tanaka, M, Terashima, A, Tomaru, T, Uchida, T, Yoshida, M, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), T2K, J-PARC Neutrino Facility Group, HEP, INSPIRE, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics - Instrumentation and Detectors, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], hep-ex, J-PARC Lab, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), beam transport, neutrino: beam, KAMIOKANDE, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), [PHYS.PHYS.PHYS-INS-DET] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Physical Sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Fysik, upgrade, Radiologi och bildbehandling, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Detectors and Experimental Techniques, physics.ins-det, Particle Physics - Experiment, activity report, Radiology, Nuclear Medicine and Medical Imaging
Abstract

International audience; In this document, technical details of the upgrade plan of the J-PARC neutrino beamline for the extension of the T2K experiment are described. T2K has proposed to accumulate data corresponding to $2\times{}10^{22}$ protons-on-target in the next decade, aiming at an initial observation of CP violation with $3\sigma$ or higher significance in the case of maximal CP violation. Methods to increase the neutrino beam intensity, which are necessary to achieve the proposed data increase, are described.

13. First Joint Oscillation Analysis of Super-Kamiokande Atmospheric and T2K Accelerator Neutrino Data.

Author

Abe K, Abe S, Bronner C, Hayato Y, Hiraide K, Hosokawa K, Ieki K, Ikeda M, Kameda J, Kanemura Y, Kaneshima R, Kashiwagi Y, Kataoka Y, Miki S, Mine S, Miura M, Moriyama S, Nakahata M, Nakano Y, Nakayama S, Noguchi Y, Sato K, Sekiya H, Shiba H, Shimizu K, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Tanaka H, Yano T, Han S, Kajita T, Okumura K, Tashiro T, Tomiya T, Wang X, Yoshida S, Fernandez P, Labarga L, Ospina N, Zaldivar B, Pointon BW, Kearns E, Mirabito J, Raaf JL, Wan L, Wester T, Bian J, Griskevich NJ, Smy MB, Sobel HW, Takhistov V, Yankelevich A, Hill J, Jang MC, Lee SH, Moon DH, Park RG, Bodur B, Scholberg K, Walter CW, Beauchêne A, Drapier O, Giampaolo A, Mueller TA, Santos AD, Paganini P, Quilain B, Rogly R, Nakamura T, Jang JS, Machado LN, Learned JG, Choi K, Iovine N, Cao S, Anthony LHV, Martin D, Prouse NW, Scott M, Uchida Y, Berardi V, Calabria NF, Catanesi MG, Radicioni E, Langella A, De Rosa G, Collazuol G, Feltre M, Iacob F, Mattiazzi M, Ludovici L, Gonin M, Périssé L, Pronost G, Fujisawa C, Horiuchi S, Kobayashi M, Liu YM, Maekawa Y, Nishimura Y, Okazaki R, Akutsu R, Friend M, Hasegawa T, Ishida T, Kobayashi T, Jakkapu M, Matsubara T, Nakadaira T, Nakamura K, Oyama Y, Portocarrero Yrey A, Sakashita K, Sekiguchi T, Tsukamoto T, Bhuiyan N, Burton GT, Di Lodovico F, Gao J, Goldsack A, Katori T, Migenda J, Ramsden RM, Xie Z, Zsoldos S, Suzuki AT, Takagi Y, Takeuchi Y, Zhong H, Feng J, Feng L, Hu JR, Hu Z, Kawaue M, Kikawa T, Mori M, Nakaya T, Wendell RA, Yasutome K, Jenkins SJ, McCauley N, Mehta P, Tarrant A, Wilking MJ, Fukuda Y, Itow Y, Menjo H, Ninomiya K, Yoshioka Y, Lagoda J, Mandal M, Mijakowski P, Prabhu YS, Zalipska J, Jia M, Jiang J, Shi W, Yanagisawa C, Harada M, Hino Y, Ishino H, Koshio Y, Nakanishi F, Sakai S, Tada T, Tano T, Ishizuka T, Barr G, Barrow D, Cook L, Samani S, Wark D, Holin A, Nova F, Jung S, Yang BS, Yang JY, Yoo J, Fannon JEP, Kneale L, Malek M, McElwee JM, Thiesse MD, Thompson LF, Wilson ST, Okazawa H, Lakshmi SM, Kim SB, Kwon E, Seo JW, Yu I, Ichikawa AK, Nakamura KD, Tairafune S, Nishijima K, Eguchi A, Nakagiri K, Nakajima Y, Shima S, Taniuchi N, Watanabe E, Yokoyama M, de Perio P, Fujita S, Jesús-Valls C, Martens K, Tsui KM, Vagins MR, Xia J, Izumiyama S, Kuze M, Matsumoto R, Terada K, Asaka R, Ishitsuka M, Ito H, Ommura Y, Shigeta N, Shinoki M, Yamauchi K, Yoshida T, Gaur R, Gousy-Leblanc V, Hartz M, Konaka A, Li X, Chen S, Xu BD, Wu Y, Zhang AQ, Zhang B, Posiadala-Zezula M, Boyd SB, Edwards R, Hadley D, Nicholson M, O'Flaherty M, Richards B, Ali A, Jamieson B, Amanai S, Marti L, Minamino A, Shibayama R, Shimamura R, Suzuki S, Abe K, Abe S, Akhlaq N, Akutsu R, Alarakia-Charles H, Ali A, Alj Hakim YI, Alonso Monsalve S, Andreopoulos C, Anthony L, Antonova M, Aoki S, Apte KA, Arai T, Arihara T, Arimoto S, Asada Y, Ashida Y, Atkin ET, Babu N, Barbi M, Barker GJ, Barr G, Barrow D, Bates P, Batkiewicz-Kwasniak M, Berardi V, Berns L, Bhadra S, Blanchet A, Blondel A, Bolognesi S, Bordoni S, Boyd SB, Bravar A, Bronner C, Bubak A, Buizza Avanzini M, Caballero JA, Calabria NF, Cao S, Carabadjac D, Carter AJ, Cartwright SL, Casado MP, Catanesi MG, Cervera A, Chakrani J, Chalumeau A, Cherdack D, Chong PS, Chvirova A, Cicerchia M, Coleman J, Collazuol G, Cook L, Cormier F, Cudd A, D'ago D, Dalmazzone C, Daret T, Dasgupta P, Davis C, Davydov YI, De Roeck A, De Rosa G, Dealtry T, Delogu CC, Densham C, Dergacheva A, Dharmapal R, Di Lodovico F, Diaz Lopez G, Dolan S, Douqa D, Doyle TA, Drapier O, Duffy KE, Dumarchez J, Dunne P, Dygnarowicz K, Eguchi A, Elias J, Emery-Schrenk S, Erofeev G, Ershova A, Eurin G, Fedorova D, Fedotov S, Feltre M, Feng L, Ferlewicz D, Finch AJ, Fiorentini Aguirre GA, Fiorillo G, Fitton MD, Franco Patiño JM, Friend M, Fujii Y, Fukuda Y, Furui Y, Giannessi L, Giganti C, Glagolev V, Gonin M, González Rosa J, Goodman EAG, Gorin A, Gorshanov K, Grassi M, Guigue M, Hadley DR, Haigh JT, Han S, Harris DA, Hartz M, Hasegawa T, Hassani S, Hastings NC, Hayato Y, Heitkamp I, Henaff D, Hino Y, Hogan M, Holeczek J, Holin A, Holvey T, Hong Van NT, Honjo T, Hosokawa K, Hu J, Ichikawa AK, Ieki K, Ikeda M, Ishida T, Ishitsuka M, Izmaylov A, Jakkapu M, Jamieson B, Jenkins SJ, Jesús-Valls C, Jia M, Jiang JJ, Ji JY, Jonsson P, Joshi S, Jung CK, Kabirnezhad M, Kaboth AC, Kajita T, Kakuno H, Kameda J, Karpova S, Kasetti SP, Kasturi VS, Kataoka Y, Katori T, Kawamura Y, Kawaue M, Kearns E, Khabibullin M, Khotjantsev A, Kikawa T, King S, Kiseeva V, Kisiel J, Kneale L, Kobayashi H, Kobayashi T, Koch L, Kodama S, Kolupanova M, Konaka A, Kormos LL, Koshio Y, Koto T, Kowalik K, Kudenko Y, Kudo Y, Kuribayashi S, Kurjata R, Kurochka V, Kutter T, Kuze M, La Commara M, Labarga L, Lachat M, Lachner K, Lagoda J, Lakshmi SM, Lamers James M, Langella A, Laporte JF, Last D, Latham N, Laveder M, Lavitola L, Lawe M, Lee Y, Leon Silverio D, Levorato S, Lewis S, Lin C, Litchfield RP, Liu SL, Li W, Longhin A, Long KR, Lopez Moreno A, Ludovici L, Lu X, Lux T, Machado LN, Magaletti L, Mahn K, Mahtani KK, Malek M, Mandal M, Manly S, Marino AD, Marti-Magro L, Martin DGR, Martini M, Martin JF, Maruyama T, Matsubara T, Matsumoto R, Matveev V, Mauger C, Mavrokoridis K, Mazzucato E, McCauley N, McFarland KS, McGrew C, McKean J, Mefodiev A, Megias GD, Mehta P, Mellet L, Metelko C, Mezzetto M, Miki S, Miller E, Minamino A, Mineev O, Mine S, Mirabito J, Miura M, Molina Bueno L, Moriyama S, Moriyama S, Morrison P, Mueller TA, Munford D, Muñoz A, Munteanu L, Nagai K, Nagai Y, Nakadaira T, Nakagiri K, Nakahata M, Nakajima Y, Nakamura A, Nakamura K, Nakamura KD, Nakano Y, Nakayama S, Nakaya T, Nakayoshi K, Naseby CER, Ngoc TV, Nguyen DT, Nguyen VQ, Niewczas K, Nishimori S, Nishimura Y, Noguchi Y, Nosek T, Nova F, Novella P, Nugent JC, O'Keeffe HM, O'Sullivan L, Odagawa T, Okazaki R, Okinaga W, Okumura K, Okusawa T, Onda N, Ospina N, Osu L, Oyama Y, Palladino V, Paolone V, Pari M, Parlone J, Pasternak J, Payne D, Penn GC, Pershey D, Pfaff M, Pickering L, Pintaudi G, Pistillo C, Popov B, Portocarrero Yrey AJ, Porwit K, Posiadala-Zezula M, Prabhu YS, Prasad H, Pupilli F, Quilain B, Quyen PT, Radermacher T, Radicioni E, Radics B, Ramirez MA, Ratoff PN, Reh M, Riccio C, Rondio E, Roth S, Roy N, Rubbia A, Russo L, Rychter A, Saenz W, Sakashita K, Sánchez F, Sato Y, Schefke T, Schloesser CM, Scholberg K, Scott M, Seiya Y, Sekiguchi T, Sekiya H, Sgalaberna D, Shaikhiev A, Shiozawa M, Shiraishi Y, Shvartsman A, Skrobova N, Skwarczynski K, Smyczek D, Smy M, Sobczyk JT, Sobel H, Soler FJP, Speers AJ, Spina R, Stroke Y, Suslov IA, Suvorov S, Suzuki A, Suzuki SY, Suzuki Y, Tada M, Tairafune S, Takeda A, Takeuchi Y, Takifuji K, Tanaka HK, Tanigawa H, Teklu A, Tereshchenko VV, Thamm N, Thompson LF, Toki W, Touramanis C, Tsukamoto T, Tzanov M, Uchida Y, Vagins M, Vargas D, Varghese M, Vasseur G, Villa E, Vinning WGS, Virginet U, Vladisavljevic T, Wachala T, Wakabayashi D, Wallace HT, Walsh JG, Wang Y, Wan L, Wark D, Wascko MO, Weber A, Wendell R, Wilking MJ, Wilkinson C, Wilson JR, Wood K, Wret C, Xia J, Xu YH, Yamamoto K, Yamamoto T, Yanagisawa C, Yang G, Yano T, Yasutome K, Yershov N, Yevarouskaya U, Yokoyama M, Yoshimoto Y, Yoshimura N, Yu M, Zaki R, Zalewska A, Zalipska J, Zaremba K, Zarnecki G, Zhang J, Zhao XY, Zhong H, Zhu T, Ziembicki M, Zimmerman ED, Zito M, and Zsoldos S

Abstract

The Super-Kamiokande and T2K Collaborations present a joint measurement of neutrino oscillation parameters from their atmospheric and beam neutrino data. It uses a common interaction model for events overlapping in neutrino energy and correlated detector systematic uncertainties between the two datasets, which are found to be compatible. Using 3244.4 days of atmospheric data and a beam exposure of 19.7(16.3)×10^{20} protons on target in (anti)neutrino mode, the analysis finds a 1.9σ exclusion of CP conservation (defined as J_{CP}=0) and a 1.2σ exclusion of the inverted mass ordering.

Published
2025
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14. Search for Periodic Time Variations of the Solar ^{8}B Neutrino Flux between 1996 and 2018 in Super-Kamiokande.

Author

Abe K, Bronner C, Hayato Y, Hiraide K, Hosokawa K, Ieki K, Ikeda M, Kameda J, Kanemura Y, Kaneshima R, Kashiwagi Y, Kataoka Y, Miki S, Mine S, Miura M, Moriyama S, Nakano Y, Nakahata M, Nakayama S, Noguchi Y, Sato K, Sekiya H, Shiba H, Shimizu K, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Tanaka H, Yano T, Han S, Kajita T, Okumura K, Tashiro T, Tomiya T, Wang X, Yoshida S, Fernandez P, Labarga L, Ospina N, Zaldivar B, Pointon BW, Kearns E, Raaf JL, Wan L, Wester T, Bian J, Griskevich NJ, Locke S, Smy MB, Sobel HW, Takhistov V, Yankelevich A, Hill J, Lee SH, Moon DH, Park RG, Jang MC, Bodur B, Scholberg K, Walter CW, Beauchêne A, Drapier O, Giampaolo A, Mueller TA, Santos AD, Paganini P, Quilain B, Nakamura T, Jang JS, Machado LN, Learned JG, Choi K, Iovine N, Cao S, Anthony LHV, Martin D, Prouse NW, Scott M, Sztuc AA, Uchida Y, Berardi V, Catanesi MG, Radicioni E, Calabria NF, Langella A, De Rosa G, Collazuol G, Iacob F, Mattiazzi M, Ludovici L, Gonin M, Pronost G, Fujisawa C, Maekawa Y, Nishimura Y, Okazaki R, Akutsu R, Friend M, Hasegawa T, Ishida T, Kobayashi T, Jakkapu M, Matsubara T, Nakadaira T, Nakamura K, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto T, Bhuiyan N, Burton GT, Di Lodovico F, Gao J, Goldsack A, Katori T, Migenda J, Xie Z, Ramsden RM, Zsoldos S, Suzuki AT, Takagi Y, Zhong H, Takeuchi Y, Feng J, Feng L, Hu JR, Hu Z, Kikawa T, Mori M, Kawaue M, Nakaya T, Wendell RA, Yasutome K, Jenkins SJ, McCauley N, Mehta P, Tarant A, Fukuda Y, Itow Y, Menjo H, Ninomiya K, Yoshioka Y, Lagoda J, Lakshmi SM, Mandal M, Mijakowski P, Prabhu YS, Zalipska J, Jia M, Jiang J, Jung CK, Wilking MJ, Yanagisawa C, Shi W, Harada M, Hino Y, Ishino H, Koshio Y, Nakanishi F, Sakai S, Tada T, Tano T, Ishizuka T, Barr G, Barrow D, Cook L, Samani S, Wark D, Holin A, Nova F, Yang BS, Yang JY, Yoo J, Jung S, Fannon JEP, Kneale L, Malek M, McElwee JM, Thiesse MD, Thompson LF, Wilson ST, Okazawa H, Kim SB, Kwon E, Seo JW, Yu I, Ichikawa AK, Nakamura KD, Tairafune S, Nishijima K, Eguchi A, Nakagiri K, Nakajima Y, Shima S, Taniuchi N, Watanabe E, Yokoyama M, de Perio P, Fujita S, Martens K, Tsui KM, Vagins MR, Xia J, Izumiyama S, Kuze M, Matsumoto R, Ishitsuka M, Ito H, Ommura Y, Shigeta N, Shinoki M, Yamauchi K, Yoshida T, Gaur R, Gousy-Leblanc V, Hartz M, Konaka A, Li X, Chen S, Xu BD, Zhang B, Posiadala-Zezula M, Boyd SB, Edwards R, Hadley D, Nicholson M, O'Flaherty M, Richards B, Ali A, Jamieson B, Amanai S, Marti L, Minamino A, and Suzuki S

Abstract

We report a search for time variations of the solar ^{8}B neutrino flux using 5804 live days of Super-Kamiokande data collected between May 31, 1996, and May 30, 2018. Super-Kamiokande measured the precise time of each solar neutrino interaction over 22 calendar years to search for solar neutrino flux modulations with unprecedented precision. Periodic modulations are searched for in a dataset comprising five-day interval solar neutrino flux measurements with a maximum likelihood method. We also applied the Lomb-Scargle method to this dataset to compare it with previous reports. The only significant modulation found is due to the elliptic orbit of the Earth around the Sun. The observed modulation is consistent with astronomical data: we measured an eccentricity of (1.53±0.35)%, and a perihelion shift of (-1.5±13.5) days.

Published
2024
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15. Erratum: Search for Cosmic-Ray Boosted Sub-GeV Dark Matter Using Recoil Protons at Super-Kamiokande [Phys. Rev. Lett. 130, 031802 (2023)].

Author

Abe K, Hayato Y, Hiraide K, Ieki K, Ikeda M, Kameda J, Kanemura Y, Kaneshima R, Kashiwagi Y, Kataoka Y, Miki S, Mine S, Miura M, Moriyama S, Nakano Y, Nakahata M, Nakayama S, Noguchi Y, Okamoto K, Sato K, Sekiya H, Shiba H, Shimizu K, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Takenaka A, Tanaka H, Watanabe S, Yano T, Han S, Kajita T, Okumura K, Tashiro T, Tomiya T, Wang X, Xia J, Yoshida S, Megias GD, Fernandez P, Labarga L, Ospina N, Zaldivar B, Pointon BW, Kearns E, Raaf JL, Wan L, Wester T, Bian J, Griskevich NJ, Kropp WR, Locke S, Smy MB, Sobel HW, Takhistov V, Yankelevich A, Hill J, Park RG, Bodur B, Scholberg K, Walter CW, Bernard L, Coffani A, Drapier O, El Hedri S, Giampaolo A, Mueller TA, Santos AD, Paganini P, Quilain B, Ishizuka T, Nakamura T, Jang JS, Learned JG, Choi K, Cao S, Anthony LHV, Martin D, Scott M, Sztuc AA, Uchida Y, Berardi V, Catanesi MG, Radicioni E, Calabria NF, Machado LN, De Rosa G, Collazuol G, Iacob F, Lamoureux M, Mattiazzi M, Ludovici L, Gonin M, Pronost G, Fujisawa C, Maekawa Y, Nishimura Y, Friend M, Hasegawa T, Ishida T, Kobayashi T, Jakkapu M, Matsubara T, Nakadaira T, Nakamura K, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto T, Boschi T, Di Lodovico F, Gao J, Goldsack A, Katori T, Migenda J, Taani M, Zsoldos S, Kotsar Y, Ozaki H, Suzuki AT, Takeuchi Y, Bronner C, Feng J, Kikawa T, Mori M, Nakaya T, Wendell RA, Yasutome K, Jenkins SJ, McCauley N, Mehta P, Tsui KM, Fukuda Y, Itow Y, Menjo H, Ninomiya K, Lagoda J, Lakshmi SM, Mandal M, Mijakowski P, Prabhu YS, Zalipska J, Jia M, Jiang J, Jung CK, Wilking MJ, Yanagisawa C, Harada M, Ishino H, Ito S, Kitagawa H, Koshio Y, Nakanishi F, Sakai S, Barr G, Barrow D, Cook L, Samani S, Wark D, Nova F, Yang JY, Malek M, McElwee JM, Stone O, Thiesse MD, Thompson LF, Okazawa H, Kim SB, Seo JW, Yu I, Ichikawa AK, Nakamura KD, Tairafune S, Nishijima K, Iwamoto K, Nakagiri K, Nakajima Y, Taniuchi N, Yokoyama M, Martens K, de Perio P, Vagins MR, Kuze M, Izumiyama S, Inomoto M, Ishitsuka M, Ito H, Kinoshita T, Matsumoto R, Ommura Y, Shigeta N, Shinoki M, Suganuma T, Yamauchi K, Martin JF, Tanaka HA, Towstego T, Akutsu R, Gousy-Leblanc V, Hartz M, Konaka A, Prouse NW, Chen S, Xu BD, Zhang B, Posiadala-Zezula M, Hadley D, Nicholson M, O'Flaherty M, Richards B, Ali A, Jamieson B, Marti L, Minamino A, Pintaudi G, Sano S, Suzuki S, and Wada K

Abstract

This corrects the article DOI: 10.1103/PhysRevLett.130.031802.

Published
2023
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16. Search for Cosmic-Ray Boosted Sub-GeV Dark Matter Using Recoil Protons at Super-Kamiokande.

Author

Abe K, Hayato Y, Hiraide K, Ieki K, Ikeda M, Kameda J, Kanemura Y, Kaneshima R, Kashiwagi Y, Kataoka Y, Miki S, Mine S, Miura M, Moriyama S, Nakano Y, Nakahata M, Nakayama S, Noguchi Y, Okamoto K, Sato K, Sekiya H, Shiba H, Shimizu K, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Takenaka A, Tanaka H, Watanabe S, Yano T, Han S, Kajita T, Okumura K, Tashiro T, Tomiya T, Wang X, Xia J, Yoshida S, Megias GD, Fernandez P, Labarga L, Ospina N, Zaldivar B, Pointon BW, Kearns E, Raaf JL, Wan L, Wester T, Bian J, Griskevich NJ, Kropp WR, Locke S, Smy MB, Sobel HW, Takhistov V, Yankelevich A, Hill J, Park RG, Bodur B, Scholberg K, Walter CW, Bernard L, Coffani A, Drapier O, El Hedri S, Giampaolo A, Mueller TA, Santos AD, Paganini P, Quilain B, Ishizuka T, Nakamura T, Jang JS, Learned JG, Choi K, Cao S, Anthony LHV, Martin D, Scott M, Sztuc AA, Uchida Y, Berardi V, Catanesi MG, Radicioni E, Calabria NF, Machado LN, De Rosa G, Collazuol G, Iacob F, Lamoureux M, Mattiazzi M, Ludovici L, Gonin M, Pronost G, Fujisawa C, Maekawa Y, Nishimura Y, Friend M, Hasegawa T, Ishida T, Kobayashi T, Jakkapu M, Matsubara T, Nakadaira T, Nakamura K, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto T, Boschi T, Di Lodovico F, Gao J, Goldsack A, Katori T, Migenda J, Taani M, Zsoldos S, Kotsar Y, Ozaki H, Suzuki AT, Takeuchi Y, Bronner C, Feng J, Kikawa T, Mori M, Nakaya T, Wendell RA, Yasutome K, Jenkins SJ, McCauley N, Mehta P, Tsui KM, Fukuda Y, Itow Y, Menjo H, Ninomiya K, Lagoda J, Lakshmi SM, Mandal M, Mijakowski P, Prabhu YS, Zalipska J, Jia M, Jiang J, Jung CK, Wilking MJ, Yanagisawa C, Harada M, Ishino H, Ito S, Kitagawa H, Koshio Y, Nakanishi F, Sakai S, Barr G, Barrow D, Cook L, Samani S, Wark D, Nova F, Yang JY, Malek M, McElwee JM, Stone O, Thiesse MD, Thompson LF, Okazawa H, Kim SB, Seo JW, Yu I, Ichikawa AK, Nakamura KD, Tairafune S, Nishijima K, Iwamoto K, Nakagiri K, Nakajima Y, Taniuchi N, Yokoyama M, Martens K, de Perio P, Vagins MR, Kuze M, Izumiyama S, Inomoto M, Ishitsuka M, Ito H, Kinoshita T, Matsumoto R, Ommura Y, Shigeta N, Shinoki M, Suganuma T, Yamauchi K, Martin JF, Tanaka HA, Towstego T, Akutsu R, Gousy-Leblanc V, Hartz M, Konaka A, Prouse NW, Chen S, Xu BD, Zhang B, Posiadala-Zezula M, Hadley D, Nicholson M, O'Flaherty M, Richards B, Ali A, Jamieson B, Marti L, Minamino A, Pintaudi G, Sano S, Suzuki S, and Wada K

Abstract

We report a search for cosmic-ray boosted dark matter with protons using the 0.37  megaton×years data collected at Super-Kamiokande experiment during the 1996-2018 period (SKI-IV phase). We searched for an excess of proton recoils above the atmospheric neutrino background from the vicinity of the Galactic Center. No such excess is observed, and limits are calculated for two reference models of dark matter with either a constant interaction cross section or through a scalar mediator. This is the first experimental search for boosted dark matter with hadrons using directional information. The results present the most stringent limits on cosmic-ray boosted dark matter and exclude the dark matter-nucleon elastic scattering cross section between 10^{-33}cm^{2} and 10^{-27}cm^{2} for dark matter mass from 1  MeV/c^{2} to 300  MeV/c^{2}.

Published
2023
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17. Measurements of neutrino oscillation parameters from the T2K experiment using 3.6 × 10 21 protons on target.

Author

Abe K, Akhlaq N, Akutsu R, Ali A, Alonso Monsalve S, Alt C, Andreopoulos C, Antonova M, Aoki S, Arihara T, Asada Y, Ashida Y, Atkin ET, Barbi M, Barker GJ, Barr G, Barrow D, Batkiewicz-Kwasniak M, Bench F, Berardi V, Berns L, Bhadra S, Blanchet A, Blondel A, Bolognesi S, Bonus T, Bordoni S, Boyd SB, Bravar A, Bronner C, Bron S, Bubak A, Buizza Avanzini M, Caballero JA, Calabria NF, Cao S, Carabadjac D, Carter AJ, Cartwright SL, Catanesi MG, Cervera A, Chakrani J, Cherdack D, Chong PS, Christodoulou G, Chvirova A, Cicerchia M, Coleman J, Collazuol G, Cook L, Cudd A, Dalmazzone C, Daret T, Davydov YI, De Roeck A, De Rosa G, Dealtry T, Delogu CC, Densham C, Dergacheva A, Di Lodovico F, Dolan S, Douqa D, Doyle TA, Drapier O, Dumarchez J, Dunne P, Dygnarowicz K, Eguchi A, Emery-Schrenk S, Erofeev G, Ershova A, Eurin G, Fedorova D, Fedotov S, Feltre M, Finch AJ, Fiorentini Aguirre GA, Fiorillo G, Fitton MD, Franco Patiño JM, Friend M, Fujii Y, Fukuda Y, Fusshoeller K, Giannessi L, Giganti C, Glagolev V, Gonin M, González Rosa J, Goodman EAG, Gorin A, Grassi M, Guigue M, Hadley DR, Haigh JT, Hamacher-Baumann P, Harris DA, Hartz M, Hasegawa T, Hassani S, Hastings NC, Hayato Y, Henaff D, Hiramoto A, Hogan M, Holeczek J, Holin A, Holvey T, Hong Van NT, Honjo T, Iacob F, Ichikawa AK, Ikeda M, Ishida T, Ishitsuka M, Israel HT, Iwamoto K, Izmaylov A, Izumi N, Jakkapu M, Jamieson B, Jenkins SJ, Jesús-Valls C, Jiang JJ, Jonsson P, Joshi S, Jung CK, Jurj PB, Kabirnezhad M, Kaboth AC, Kajita T, Kakuno H, Kameda J, Kasetti SP, Kataoka Y, Katayama Y, Katori T, Kawaue M, Kearns E, Khabibullin M, Khotjantsev A, Kikawa T, Kikutani H, King S, Kiseeva V, Kisiel J, Kobata T, Kobayashi H, Kobayashi T, Koch L, Kodama S, Konaka A, Kormos LL, Koshio Y, Kostin A, Koto T, Kowalik K, Kudenko Y, Kudo Y, Kuribayashi S, Kurjata R, Kutter T, Kuze M, La Commara M, Labarga L, Lachner K, Lagoda J, Lakshmi SM, Lamers James M, Lamoureux M, Langella A, Laporte JF, Last D, Latham N, Laveder M, Lavitola L, Lawe M, Lee Y, Lin C, Lin SK, Litchfield RP, Liu SL, Li W, Longhin A, Long KR, Lopez Moreno A, Ludovici L, Lu X, Lux T, Machado LN, Magaletti L, Mahn K, Malek M, Mandal M, Manly S, Marino AD, Marti-Magro L, Martin DGR, Martini M, Martin JF, Maruyama T, Matsubara T, Matveev V, Mauger C, Mavrokoridis K, Mazzucato E, McCauley N, McElwee J, McFarland KS, McGrew C, McKean J, Mefodiev A, Megias GD, Mehta P, Mellet L, Metelko C, Mezzetto M, Miller E, Minamino A, Mineev O, Mine S, Miura M, Molina Bueno L, Moriyama S, Moriyama S, Morrison P, Mueller TA, Munford D, Munteanu L, Nagai K, Nagai Y, Nakadaira T, Nakagiri K, Nakahata M, Nakajima Y, Nakamura A, Nakamura H, Nakamura K, Nakamura KD, Nakano Y, Nakayama S, Nakaya T, Nakayoshi K, Naseby CER, Ngoc TV, Nguyen VQ, Niewczas K, Nishimori S, Nishimura Y, Nishizaki K, Nosek T, Nova F, Novella P, Nugent JC, O'Keeffe HM, O'Sullivan L, Odagawa T, Ogawa T, Okada R, Okinaga W, Okumura K, Okusawa T, Ospina N, Owen RA, Oyama Y, Palladino V, Paolone V, Pari M, Parlone J, Parsa S, Pasternak J, Pavin M, Payne D, Penn GC, Pershey D, Pickering L, Pidcott C, Pintaudi G, Pistillo C, Popov B, Porwit K, Posiadala-Zezula M, Prabhu YS, Pupilli F, Quilain B, Radermacher T, Radicioni E, Radics B, Ramírez MA, Ratoff PN, Reh M, Riccio C, Rondio E, Roth S, Roy N, Rubbia A, Ruggeri AC, Ruggles CA, Rychter A, Sakashita K, Sánchez F, Santucci G, Schloesser CM, Scholberg K, Scott M, Seiya Y, Sekiguchi T, Sekiya H, Sgalaberna D, Shaikhiev A, Shaker F, Shaykina A, Shiozawa M, Shorrock W, Shvartsman A, Skrobova N, Skwarczynski K, Smyczek D, Smy M, Sobczyk JT, Sobel H, Soler FJP, Sonoda Y, Speers AJ, Spina R, Suslov IA, Suvorov S, Suzuki A, Suzuki SY, Suzuki Y, Sztuc AA, Tada M, Tairafune S, Takayasu S, Takeda A, Takeuchi Y, Takifuji K, Tanaka HK, Tanihara Y, Tani M, Teklu A, Tereshchenko VV, Teshima N, Thamm N, Thompson LF, Toki W, Touramanis C, Towstego T, Tsui KM, Tsukamoto T, Tzanov M, Uchida Y, Vagins M, Vargas D, Varghese M, Vasseur G, Vilela C, Villa E, Vinning WGS, Virginet U, Vladisavljevic T, Wachala T, Walsh JG, Wang Y, Wan L, Wark D, Wascko MO, Weber A, Wendell R, Wilking MJ, Wilkinson C, Wilson JR, Wood K, Wret C, Xia J, Xu YH, Yamamoto K, Yamamoto T, Yanagisawa C, Yang G, Yano T, Yasutome K, Yershov N, Yevarouskaya U, Yokoyama M, Yoshimoto Y, Yoshimura N, Yu M, Zaki R, Zalewska A, Zalipska J, Zaremba K, Zarnecki G, Zhao X, Zhu T, Ziembicki M, Zimmerman ED, Zito M, and Zsoldos S

Abstract

The T2K experiment presents new measurements of neutrino oscillation parameters using 19.7 ( 16.3 ) × 10 20 protons on target (POT) in (anti-)neutrino mode at the far detector (FD). Compared to the previous analysis, an additional 4.7 × 10 20 POT neutrino data was collected at the FD. Significant improvements were made to the analysis methodology, with the near-detector analysis introducing new selections and using more than double the data. Additionally, this is the first T2K oscillation analysis to use NA61/SHINE data on a replica of the T2K target to tune the neutrino flux model, and the neutrino interaction model was improved to include new nuclear effects and calculations. Frequentist and Bayesian analyses are presented, including results on sin 2 θ 13 and the impact of priors on the δ CP measurement. Both analyses prefer the normal mass ordering and upper octant of sin 2 θ 23 with a nearly maximally CP-violating phase. Assuming the normal ordering and using the constraint on sin 2 θ 13 from reactors, sin 2 θ 23 = 0 . 561 - 0.032 + 0.021 using Feldman-Cousins corrected intervals, and Δ m 32 2 = 2 . 494 - 0.058 + 0.041 × 10 - 3 eV 2 using constant Δ χ 2 intervals. The CP-violating phase is constrained to δ CP = - 1 . 97 - 0.70 + 0.97 using Feldman-Cousins corrected intervals, and δ CP = 0 , π is excluded at more than 90% confidence level. A Jarlskog invariant of zero is excluded at more than 2 σ credible level using a flat prior in δ CP , and just below 2 σ using a flat prior in sin δ CP . When the external constraint on sin 2 θ 13 is removed, sin 2 θ 13 = 28 . 0 - 6.5 + 2.8 × 10 - 3 , in agreement with measurements from reactor experiments. These results are consistent with previous T2K analyses., (© The Author(s) 2023.)

Published
2023
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