Papers - NISHIMURA Yasuhiro

Measurement of inclusive double-differential νμ charged-current cross section with improved acceptance in the T2K off-axis near detector

Abe K., Amey J., Andreopoulos C., Anthony L., Antonova M., Aoki S., Ariga A., Ashida Y., Azuma Y., Ban S., Barbi M., Barker G.J., Barr G., Barry C., Batkiewicz M., Berardi V., Berkman S., Berner R.M., Bhadra S., Bienstock S., Blondel A., Bolognesi S., Bordoni S., Bourguille B., Boyd S.B., Brailsford D., Bravar A., Bronner C., Buizza Avanzini M., Calcutt J., Campbell T., Cao S., Cartwright S.L., Catanesi M.G., Cervera A., Chappell A., Checchia C., Cherdack D., Chikuma N., Christodoulou G., Coleman J., Collazuol G., Coplowe D., Cudd A., Dabrowska A., De Rosa G., Dealtry T., Denner P.F., Dennis S.R., Densham C., Di Lodovico F., Dolan S., Drapier O., Duffy K.E., Dumarchez J., Dunne P., Emery-Schrenk S., Ereditato A., Feusels T., Finch A.J., Fiorentini G.A., Fiorillo G., Francois C., Friend M., Fujii Y., Fukuda D., Fukuda Y., Garcia A., Giganti C., Gizzarelli F., Golan T., Gonin M., Hadley D.R., Haegel L., Haigh J.T., Hamacher-Baumann P., Hansen D., Harada J., Hartz M., Hasegawa T., Hastings N.C., Hayashino T., Hayato Y., Hiraki T., Hiramoto A., Hirota S., Hogan M., Holeczek J., Hosomi F., Ichikawa A.K., Ikeda M., Imber J., Inoue T., Intonti R.A., Ishida T., Ishii T., Iwamoto K., Izmaylov A., Jamieson B., Jiang M.

Physical Review D (Physical Review D)  98 ( 1 )  2018.07

ISSN  24700010

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We report a measurement of the flux-integrated cross section for inclusive muon neutrino charged-current interactions on carbon. The double-differential measurements are given as a function of the muon momentum and angle. Relative to our previous publication on this topic, these results have an increased angular acceptance and higher statistics. The data sample presented here corresponds to 5.7×1020 protons on target. The total flux-integrated cross section is measured to be (6.950±0.662)×10-39 cm2 nucleon-1 and is consistent with our simulation.

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Physics potentials with the second Hyper-Kamiokande detector in Korea

Abe K., Abe K., Ahn S.H., Aihara H., Aimi A., Akutsu R., Andreopoulos C., Anghel I., Anthony L.H.V., Antonova M., Ashida Y., Aushev V., Barbi M., Barker G.J., Barr G., Beltrame P., Berardi V., Bergevin M., Berkman S., Berns L., Berry T., Bhadra S., Blaszczyk F.D.M., Blondel A., Bolognesi S., Boyd S.B., Bravar A., Bronner C., Buizza Avanzini M., Cafagna F.S., Calland R., Cao S., Cartwright S.L., Catanesi M.G., Checchia C., Chen-Wishart Z., Cheon B.G., Cheoun M.K., Cho K., Choi J.H., Choi K., Choi K.Y., Chun E.J., Cole A., Coleman J., Collazuol G., Cowan G., Cremonesi L., Dealtry T., De Rosa G., Densham C., Dewhurst D., Drakopoulou E., Di Lodovico F., Drapier O., Dumarchez J., Dunne P., Dziewiecki M., Emery S., Esmaili A., Evangelisti A., Fernández-Martinez E., Feusels T., Finch A., Fiorentini G.A., Fiorillo G., Fitton M., Frankiewicz K., Friend M., Fujii Y., Fukuda Y., Fukuda D., Ganezer K., Ghosh M., Giganti C., Gonin M., Grant N., Gumplinger P., Hadley D.R., Hartfiel B., Hartz M., Hayato Y., Hayrapetyan K., Hill J., Hirota S., Horiuchi S., Ichikawa A.K., Iijima T., Ikeda M., Imber J., Inoue K., Insler J., Intonti R.A., Ioannisian A., Ishida T., Ishino H., Ishitsuka M., Itow Y., Iwamoto K., Izmaylov A.

Progress of Theoretical and Experimental Physics (Progress of Theoretical and Experimental Physics)  2018 ( 6 )  2018.06

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Hyper-Kamiokande consists of two identical water-Cherenkov detectors of total 520 kt, with the first one in Japan at 295 km from the J-PARC neutrino beam with 2.5° off-axis angles (OAAs), and the second one possibly in Korea at a later stage. Having the second detector in Korea would benefit almost all areas of neutrino oscillation physics, mainly due to longer baselines. There are several candidate sites in Korea with baselines of 1000-1300 km and OAAs of 1°-3°. We conducted sensitivity studies on neutrino oscillation physics for a second detector, either in Japan (JD × 2) or Korea (JD + KD), and compared the results with a single detector in Japan. Leptonic charge-parity (CP) symmetry violation sensitivity is improved, especially when the CP is non-maximally violated. The larger matter effect at Korean candidate sites significantly enhances sensitivities to non-standard interactions of neutrinos and mass ordering determination. Current studies indicate the best sensitivity is obtained at Mt. Bisul (1088 km baseline, 1.3° OAA). Thanks to a larger (1000 m) overburden than the first detector site, clear improvements to sensitivities for solar and supernova relic neutrino searches are expected.

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Search for Boosted Dark Matter Interacting with Electrons in Super-Kamiokande

Kachulis C., Abe K., Bronner C., Hayato Y., Ikeda M., Iyogi K., Kameda J., Kato Y., Kishimoto Y., Marti L., Miura M., Moriyama S., Nakahata M., Nakano Y., Nakayama S., Okajima Y., Orii A., Pronost G., Sekiya H., Shiozawa M., Sonoda Y., Takeda A., Takenaka A., Tanaka H., Tasaka S., Tomura T., Akutsu R., Kajita T., Kaneyuki K., Nishimura Y., Okumura K., Tsui K.M., Labarga L., Fernandez P., Blaszczyk F.D.M., Gustafson J., Kearns E., Raaf J.L., Stone J.L., Sulak L.R., Berkman S., Tobayama S., Goldhaber M., Elnimr M., Kropp W.R., Mine S., Locke S., Weatherly P., Smy M.B., Sobel H.W., Takhistov V., Ganezer K.S., Hill J., Kim J.Y., Lim I.T., Park R.G., Himmel A., Li Z., O'Sullivan E., Scholberg K., Walter C.W., Ishizuka T., Nakamura T., Jang J.S., Choi K., Learned J.G., Matsuno S., Smith S.N., Amey J., Litchfield R.P., Ma W.Y., Uchida Y., Wascko M.O., Cao S., Friend M., Hasegawa T., Ishida T., Ishii T., Kobayashi T., Nakadaira T., Nakamura K., Oyama Y., Sakashita K., Sekiguchi T., Tsukamoto T., Abe K., Hasegawa M., Suzuki A.T., Takeuchi Y., Yano T., Hayashino T., Hiraki T., Hirota S., Huang K., Jiang M., Nakamura K., Nakaya T., Quilain B., Patel N.D., Wendell R.A.

Physical Review Letters (Physical Review Letters)  120 ( 22 )  2018.05

ISSN  00319007

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A search for boosted dark matter using 161.9 kt yr of Super-Kamiokande IV data is presented. We search for an excess of elastically scattered electrons above the atmospheric neutrino background, with a visible energy between 100 MeV and 1 TeV, pointing back to the Galactic center or the Sun. No such excess is observed. Limits on boosted dark matter event rates in multiple angular cones around the Galactic center and Sun are calculated. Limits are also calculated for a baseline model of boosted dark matter produced from cold dark matter annihilation or decay. This is the first experimental search for boosted dark matter from the Galactic center or the Sun interacting in a terrestrial detector.

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Search for Neutrinos in Super-Kamiokande Associated with the GW170817 Neutron-star Merger

Abe K., Bronner C., Hayato Y., Ikeda M., Iyogi K., Kameda J., Kato Y., Kishimoto Y., Marti L., Miura M., Moriyama S., Nakahata M., Nakajima Y., Nakano Y., Nakayama S., Orii A., Pronost G., Sekiya H., Shiozawa M., Sonoda Y., Takeda A., Takenaka A., Tanaka H., Tasaka S., Yano T., Akutsu R., Kajita T., Nishimura Y., Okumura K., Tsui K.M., Labarga L., Fernandez P., Blaszczyk F.D.M., Kachulis C., Kearns E., Raaf J.L., Stone J.L., Sulak L.R., Berkman S., Tobayama S., Bian J., Elnimr M., Kropp W.R., Locke S., Mine S., Weatherly P., Smy M.B., Sobel H.W., Takhistov V., Ganezer K.S., Hill J., Kim J.Y., Lim I.T., Park R.G., Li Z., O'Sullivan E., Scholberg K., Walter C.W., Gonin M., Imber J., Mueller T.A., Ishizuka T., Nakamura T., Jang J.S., Choi K., Learned J.G., Matsuno S., Amey J., Litchfield R.P., Ma W.Y., Uchida Y., Wascko M.O., Catanesi M.G., Intonti R.A., Radicioni E., Rosa G.D., Ali A., Collazuol G., Ludovici L., Cao S., Friend M., Hasegawa T., Ishida T., Ishii T., Kobayashi T., Nakadaira T., Nakamura K., Oyama Y., Sakashita K., Sekiguchi T., Tsukamoto T., Abe K.E., Hasegawa M., Suzuki A.T., Takeuchi Y., Hayashino T., Hirota S., Jiang M., Mori M., Nakamura K.E.

Astrophysical Journal Letters (Astrophysical Journal Letters)  857 ( 1 )  2018.04

ISSN  20418205

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We report the results of a neutrino search in Super-Kamiokande (SK) for coincident signals with the first detected gravitational wave (GW) produced by a binary neutron-star merger, GW170817, which was followed by a short gamma-ray burst, GRB170817A, and a kilonova/macronova. We searched for coincident neutrino events in the range from 3.5 MeV to ∼100 PeV, in a time window ±500 s around the gravitational wave detection time, as well as during a 14-day period after the detection. No significant neutrino signal was observed for either time window. We calculated 90% confidence level upper limits on the neutrino fluence for GW170817. From the upward-going-muon events in the energy region above 1.6 GeV, the neutrino fluence limit is () cm-2 for muon neutrinos (muon antineutrinos), with an error range of ±5around the zenith angle of NGC4993, and the energy spectrum is under the assumption of an index of-2. The fluence limit for neutrino energies less than 100 MeV, for which the emission mechanism would be different than for higher-energy neutrinos, is also calculated. It is 6.6 × 107 cm-2 for anti-electron neutrinos under the assumption of a Fermi-Dirac spectrum with average energy of 20 MeV.

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Atmospheric neutrino oscillation analysis with external constraints in Super-Kamiokande I-IV

Abe K., Bronner C., Haga Y., Hayato Y., Ikeda M., Iyogi K., Kameda J., Kato Y., Kishimoto Y., Marti L., Miura M., Moriyama S., Nakahata M., Nakajima T., Nakano Y., Nakayama S., Okajima Y., Orii A., Pronost G., Sekiya H., Shiozawa M., Sonoda Y., Takeda A., Takenaka A., Tanaka H., Tasaka S., Tomura T., Akutsu R., Irvine T., Kajita T., Kametani I., Kaneyuki K., Nishimura Y., Okumura K., Richard E., Tsui K.M., Labarga L., Fernandez P., Blaszczyk F.D.M., Gustafson J., Kachulis C., Kearns E., Raaf J.L., Stone J.L., Sulak L.R., Berkman S., Tobayama S., Goldhaber M., Carminati G., Elnimr M., Kropp W.R., Mine S., Locke S., Renshaw A., Smy M.B., Sobel H.W., Takhistov V., Weatherly P., Ganezer K.S., Hartfiel B.L., Hill J., Hong N., Kim J.Y., Lim I.T., Park R.G., Akiri T., Himmel A., Li Z., O'Sullivan E., Scholberg K., Walter C.W., Wongjirad T., Ishizuka T., Nakamura T., Jang J.S., Choi K., Learned J.G., Matsuno S., Smith S.N., Amey J., Litchfield R.P., Ma W.Y., Uchida Y., Wascko M.O., Cao S., Friend M., Hasegawa T., Ishida T., Ishii T., Kobayashi T., Nakadaira T., Nakamura K., Oyama Y., Sakashita K., Sekiguchi T., Tsukamoto T., Abe K., Hasegawa M., Suzuki A.T., Takeuchi Y.

Physical Review D (Physical Review D)  97 ( 7 )  2018.04

ISSN  24700010

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An analysis of atmospheric neutrino data from all four run periods of Super-Kamiokande optimized for sensitivity to the neutrino mass hierarchy is presented. Confidence intervals for Δm322, sin2θ23, sin2θ13 and δCP are presented for normal neutrino mass hierarchy and inverted neutrino mass hierarchy hypotheses, based on atmospheric neutrino data alone. Additional constraints from reactor data on θ13 and from published binned T2K data on muon neutrino disappearance and electron neutrino appearance are added to the atmospheric neutrino fit to give enhanced constraints on the above parameters. Over the range of parameters allowed at 90% confidence level, the normal mass hierarchy is favored by between 91.9% and 94.5% based on the combined Super-Kamiokande plus T2K result.

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Measurement of the single π 0 production rate in neutral current neutrino interactions on water

Abe K., Amey J., Andreopoulos C., Antonova M., Aoki S., Ariga A., Ashida Y., Assylbekov S., Autiero D., Ban S., Barbi M., Barker G.J., Barr G., Barry C., Bartet-Friburg P., Batkiewicz M., Berardi V., Berkman S., Bhadra S., BienstocK S., Blondel A., Bolognesi S., Bordoni S., Boyd S.B., Brailsford D., Bravar A., Bronner C., Buizza Avanzini M., Calland R.G., Campbell T., Cao S., Cartwright S.L., Castillo R., Catanesi M.G., Cervera A., Chappell A., Checchia C., CherdacK D., Chikuma N., Christodoulou G., Clifton A., Coleman J., Collazuol G., Coplowe D., Cremonesi L., Cudd A., Dabrowska A., De Rosa G., Dealtry T., Denner P.F., Dennis S.R., Densham C., Dewhurst D., Di Lodovico F., Di Luise S., Dolan S., Drapier O., Duffy K.E., Dumarchez J., Dunkman M., Dunne P., Dziewiecki M., Emery-SchrenK S., Ereditato A., Feusels T., Finch A.J., Fiorentini G.A., Friend M., Fujii Y., Fukuda D., Fukuda Y., Furmanski A.P., Galymov V., Garcia A., Giffin S.G., Giganti C., Gilje K., Gizzarelli F., Golan T., Gonin M., Grant N., Hadley D.R., Haegel L., Haigh J.T., Hamilton P., Hansen D., Harada J., Hara T., Hartz M., Hasegawa T., Hastings N.C., Hayashino T., Hayato Y., Helmer R.L., Hierholzer M., Hillairet A., Himmel A., Hiraki T., Hiramoto A., Hirota S.

Physical Review D (Physical Review D)  97 ( 3 )  2018.02

ISSN  24700010

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The single π0 production rate in neutral current neutrino interactions on water in a neutrino beam with a peak neutrino energy of 0.6 GeV has been measured using the PØD, one of the subdetectors of the T2K near detector. The production rate was measured for data taking periods when the PØD contained water (2.64×1020 protons-on-target) and also periods without water (3.49×1020 protons-on-target). A measurement of the neutral current single π0 production rate on water is made using appropriate subtraction of the production rate with water in from the rate with water out of the target region. The subtraction analysis yields 106±41±69 signal events where the uncertainties are statistical (stat.) and systematic (sys.) respectively. This is consistent with the prediction of 157 events from the nominal simulation. The measured to expected ratio is 0.68±0.26(stat)±0.44(sys)±0.12(flux). The nominal simulation uses a flux integrated cross section of 7.63×10-39 cm2 per nucleon with an average neutrino interaction energy of 1.3 GeV.

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First measurement of the νμ charged-current cross section on a water target without pions in the final state

Abe K., Amey J., Andreopoulos C., Antonova M., Aoki S., Ariga A., Ashida Y., Ban S., Barbi M., Barker G.J., Barr G., Barry C., Batkiewicz M., Berardi V., Berkman S., Bhadra S., Bienstock S., Blondel A., Bolognesi S., Bordoni S., Boyd S.B., Brailsford D., Bravar A., Bronner C., Buizza Avanzini M., Calland R.G., Campbell T., Cao S., Cartwright S.L., Catanesi M.G., Cervera A., Chappell A., Checchia C., Cherdack D., Chikuma N., Christodoulou G., Coleman J., Collazuol G., Coplowe D., Cudd A., Dabrowska A., De Rosa G., Dealtry T., Denner P.F., Dennis S.R., Densham C., Di Lodovico F., Dolan S., Drapier O., Duffy K.E., Dumarchez J., Dunne P., Emery-Schrenk S., Ereditato A., Feusels T., Finch A.J., Fiorentini G.A., Friend M., Fujii Y., Fukuda D., Fukuda Y., Garcia A., Giganti C., Gizzarelli F., Golan T., Gonin M., Hadley D.R., Haegel L., Haigh J.T., Hansen D., Harada J., Hartz M., Hasegawa T., Hastings N.C., Hayashino T., Hayato Y., Hillairet A., Hiraki T., Hiramoto A., Hirota S., Hogan M., Holeczek J., Hosomi F., Huang K., Ichikawa A.K., Ikeda M., Imber J., Insler J., Intonti R.A., Ishida T., Ishii T., Iwai E., Iwamoto K., Izmaylov A., Jamieson B., Jiang M., Johnson S., Jonsson P., Jung C.K., Kabirnezhad M.

Physical Review D (Physical Review D)  97 ( 1 )  2018.01

ISSN  24700010

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This paper reports the first differential measurement of the charged-current interaction cross section of νμ on water with no pions in the final state. This flux-averaged measurement has been made using the T2K experiment's off-axis near detector, and is reported in doubly differential bins of muon momentum and angle. The flux-averaged total cross section in a restricted region of phase space was found to be σ=(0.95±0.08(stat)±0.06(det syst)±0.04(model syst)±0.08(flux))×10-38 cm2/n.

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