Publications


Reconstruction and measurement of O(100) MeV energy electromagnetic activity from pi(0) -> gamma gamma decays in the MicroBooNE LArTPC

JOURNAL OF INSTRUMENTATION 15 (2020) ARTN P02007

C Adams, M Alrashed, R An, J Anthony, J Asaadi, A Ashkenazi, S Balasubramanian, B Baller, C Barnes, G Barr, V Basque, M Bass, F Bay, S Berkman, A Bhanderi, A Bhat, M Bishai, A Blake, T Bolton, L Camilleri, D Caratelli, IC Terrazas, R Carr, RC Fernandez, F Cavanna, G Cerati, Y Chen, E Church, D Cianci, EO Cohen, JM Conrad, M Convery, L Cooper-Troendle, JI Crespo-Anadon, M Del Tutto, D Devitt, A Diaz, L Domine, K Duffy, S Dytman, B Eberly, A Ereditato, LE Sanchez, J Esquivel, JJ Evans, RS Fitzpatrick, BT Fleminga, N Foppiani, D Franco, AP Furmanski, D Garcia-Gamez, S Gardiner, V Genty, D Goeldi, S Gollapinni, O Goodwin, E Gramellini, P Green, H Greenlee, R Grosso, L Gu, W Gu, R Guenette, P Guzowski, P Hamilton, O Hen, C Hill, GA Horton-Smith, A Hourlier, E-C Huang, R Itay, C James, JJ de Vries, X Ji, L Jiang, JH Jo, RA Johnson, J Joshi, Y-J Jwa, G Karagiorgi, W Ketchum, B Kirby, M Kirby, T Kobilarcik, I Kreslo, I Lepetic, Y Li, A Lister, BR Littlejohn, S Lockwitz, D Lorca, WC Louis, M Luethi, B Lundberg, X Luo, A Marchionni, S Marcocci, C Mariani, J Marshall, J Martin-Albo, DAM Caicedo, K Mason, A Mastbaum, N McConkey, V Meddage, T Mettler, K Miller, J Mills, K Mistry, A Mogan, T Mohayai, J Moon, M Mooney, CD Moore, J Mousseau, M Murphy, R Murrells, D Naples, RK Neely, P Nienaber, J Nowak, O Palamara, V Pandey, V Paolone, A Papadopoulou, V Papavassiliou, SF Pate, A Paudel, Z Pavlovic, E Piasetzky, D Porzio, S Prince, G Pulliam, X Qian, JL Raaf, A Rafique, L Ren, L Rochester, HE Rogers, M Ross-Lonergan, CR von Rohr, B Russell, G Scanavini, DW Schmitz, A Schukraft, W Seligman, MH Shaevitz, R Sharankova, J Sinclair, A Smith, EL Snider, M Soderberg, S Soldner-Rembold, SR Soleti, P Spentzouris, J Spitz, M Stancari, J St John, T Strauss, K Sutton, S Sword-Fehlberg, AM Szelc, N Tagg, W Tang, K Terao, RT Thornton, M Toups, Y-T Tsai, S Tufanli, T Usher, W Van De Pontseele, RG Van de Water, B Viren, M Weber, H Wei, DA Wickremasinghe, Z Williams, S Wolbers, T Wongjirad, K Woodruff, M Wospakrik, W Wu, T Yang, G Yarbrough, LE Yates, GP Zeller, J Zennamo, C Zhang, M Collaboration


Search for electron antineutrino appearance in a long-baseline muon antineutrino beam

Physical Review Letters American Physical Society 124 (2020) 161802

M Friend, K Fusshoeller, K Gameil, A Gorin, NC Hastings, J Holeczek, NT Hongvan, M Kabirnezhad, E Kearns, M Miura, M Nakahata, Y Nakajima, A Nakamura, KG Nakamura, TV Ngoc, K Niewczas, K Nishikawa, B Radics, C Riccio, E Rondio, S Roth, A Rubbia, AC Ruggeri, CA Ruggles, CM Schloesser

Electron antineutrino appearance is measured by the T2K experiment in an accelerator-produced antineutrino beam, using additional neutrino beam operation to constrain parameters of the Pontecorvo-Maki-Nakagawa-Sakata (PMNS) mixing matrix. T2K observes 15 candidate electron antineutrino events with a background expectation of 9.3 events. Including information from the kinematic distribution of observed events, the hypothesis of no electron antineutrino appearance is disfavored with a significance of 2.40σ and no discrepancy between data and PMNS predictions is found. A complementary analysis that introduces an additional free parameter which allows non-PMNS values of electron neutrino and antineutrino appearance also finds no discrepancy between data and PMNS predictions.


Design and performance of a 35-ton liquid argon time projection chamber as a prototype for future very large detectors

JOURNAL OF INSTRUMENTATION 15 (2020) ARTN P03035

DL Adams, M Baird, G Barr, N Barros, A Blake, E Blaufuss, A Booth, D Brailsford, N Buchanan, B Carls, H Chen, M Convery, G De Geronimo, T Dealtry, R Dharmapalan, Z Djurcic, J Fowler, S Glavin, RA Gomes, MC Goodman, M Graham, L Greenler, A Hahn, J Hartnell, R Herbst, A Higuera, A Himmel, J Insler, J Jacobsen, T Junk, B Kirby, J Klein, VA Kudryavtsev, T Kutter, Y Li, X Li, S Lin, N McConkey, CA Moura, S Mufson, N Nambiar, J Nowak, M Nunes, R Paulos, X Qian, O Rodrigues, W Sands, G Santucci, R Sharma, G Sinev, NJC Spooner, I Stancu, D Stefan, J Stewart, J Stock, T Strauss, R Sulej, Y Sun, M Thiesse, LF Thompson, YT Tsai, R Van Berg, T Vieira, M Wallbank, H Wang, Y Wang, TK Warburton, D Wenman, D Whittington, RJ Wilson, M Worcester, T Yang, B Yu, C Zhang


Simultaneous measurement of the muon neutrino charged-current cross section on oxygen and carbon without pions in the final state at T2K

PHYSICAL REVIEW D 101 (2020) ARTN 112004

K Abe, N Akhlaq, R Akutsu, A Ali, C Alt, C Andreopoulos, L Anthony, M Antonova, S Aoki, A Ariga, T Arihara, Y Asada, Y Ashida, ET Atkin, Y Awataguchi, S Ban, M Barbi, GJ Barker, G Barr, D Barrow, M Batkiewicz-Kwasniak, A Beloshapkin, F Bench, V Berardi, L Berns, S Bhadra, S Bienstock, S Bolognesi, T Bonus, B Bourguille, SB Boyd, A Bravar, D Bravo Berguno, C Bronner, S Bron, A Bubak, MB Avanzini, T Campbell, S Cao, SL Cartwright, MG Catanesi, A Cervera, D Cherdack, N Chikuma, G Christodoulou, M Cicerchia, J Coleman, G Collazuol, L Cook, D Coplowe, A Cudd, A Dabrowska, G De Rosa, T Dealtry, SR Dennis, C Densham, F Di Lodovico, N Dokania, S Dolan, TA Doyle, O Drapier, J Dumarchez, P Dunne, A Eguchi, L Eklund, S Emery-Schrenk, A Ereditato, AJ Finch, G Fiorillo, C Francois, M Friend, Y Fujii, R Fujita, D Fukuda, R Fukuda, Y Fukuda, K Fusshoeller, C Giganti, M Gonin, A Gorin, M Guigue, DR Hadley, JT Haigh, P Hamacher-Baumann, M Hartz, T Hasegawa, S Hassani, NC Hastings, Y Hayato, A Hiramoto, M Hogan, J Holeczek, NTH Van, T Honjo, F Iacob, AK Ichikawa, M Ikeda, T Ishida, M Ishitsuka, K Iwamoto, A Izmaylov, N Izumi, M Jakkapu, B Jamieson, SJ Jenkins, C Jesus-Valls, M Jiang, P Jonsson, CK Jung, X Junjie, PB Jurj, M Kabirnezhad, AC Kaboth, T Kajita, H Kakuno, J Kameda, D Karlen, SP Kasetti, Y Kataoka, Y Katayama, T Katori, Y Kato, E Kearns, M Khabibullin, A Khotjantsev, T Kikawa, H Kikutani, H Kim, S King, J Kisiel, A Knight, T Kobata, T Kobayashi, L Koch, T Koga, A Konaka, LL Kormos, Y Koshio, A Kostin, K Kowalik, H Kubo, Y Kudenko, N Kukita, S Kuribayashi, R Kurjata, T Kutter, M Kuze, L Labarga, J Lagoda, M Lamoureux, D Last, M Lawe, M Licciardi, RP Litchfield, SL Liu, X Li, A Longhin, L Ludovici, X Lu, T Lux, LN Machado, L Magaletti, K Mahn, M Malek, S Manly, L Maret, AD Marino, L Marti-Magro, T Maruyama, T Matsubara, K Matsushita, V Matveev, C Mauger, K Mavrokoridis, E Mazzucato, N McCauley, J McElwee, KS McFarland, C McGrew, A Mefodiev, C Metelko, M Mezzetto, A Minamino, O Mineev, S Mine, M Miura, LM Bueno, S Moriyama, TA Mueller, L Munteanu, S Murphy, Y Nagai, T Nakadaira, M Nakahata, Y Nakajima, A Nakamura, K Nakamura, S Nakayama, T Nakaya, K Nakayoshi, CER Naseby, TV Ngoc, K Niewczas, K Nishikawa, Y Nishimura, E Noah, TS Nonnenmacher, F Nova, P Novella, J Nowak, JC Nugent, HM O'Keeffe, L O'Sullivan, T Odagawa, T Ogawa, R Okada, K Okumura, T Okusawa, SM Oser, RA Owen, Y Oyama, V Palladino, V Paolone, M Pari, WC Parker, S Parsa, J Pasternak, M Pavin, D Payne, GC Penn, L Pickering, C Pidcott, G Pintaudi, C Pistillo, B Popov, K Porwit, M Posiadala-Zezula, A Pritchard, B Quilain, T Radermacher, E Radicioni, B Radics, PN Ratoff, C Riccio, E Rondio, S Roth, A Rubbia, AC Ruggeri, C Ruggles, A Rychter, K Sakashita, F Sanchez, G Santucci, CM Schloesser, K Scholberg, M Scott, Y Seiya, T Sekiguchi, H Sekiya, D Sgalaberna, A Shaikhiev, A Shaykina, M Shiozawa, W Shorrock, A Shvartsman, M Smy, JT Sobczyk, H Sobel, FJP Soler, Y Sonoda, S Suvorov, A Suzuki, SY Suzuki, Y Suzuki, AA Sztuc, M Tada, M Tajima, A Takeda, Y Takeuchi, HK Tanaka, HA Tanaka, S Tanaka, Y Tanihara, N Teshima, LF Thompson, W Toki, C Touramanis, T Towstego, KM Tsui, T Tsukamoto, M Tzanov, Y Uchida, M Vagins, S Valder, Z Vallari, D Vargas, G Vasseur, WGS Vinning, T Vladisavljevic, VV Volkov, T Wachala, J Walker, JG Walsh, Y Wang, D Wark, MO Wascko, A Weber, R Wendell, MJ Wilking, C Wilkinson, JR Wilson, K Wood, C Wret, K Yamamoto, C Yanagisawa, G Yang, T Yano, K Yasutome, N Yershov, M Yokoyama, T Yoshida, M Yu, A Zalewska, J Zalipska, K Zaremba, G Zarnecki, M Ziembicki, ED Zimmerman, M Zito, S Zsoldos, A Zykova, T Collaboration


Measurement of the muon neutrino charged-current single $π^+$ production on hydrocarbon using the T2K off-axis near detector ND280

Physical Review D: Particles, Fields, Gravitation and Cosmology American Physical Society (2020)

K Abe, R Akutsu, A Ali, C Alt, J Amey, C Andreopoulos, L Anthony, M Antonova, S Aoki, A Ariga, Y Ashida, ET Atkin, Y Awataguchi, Y Azuma, S Ban, M Barbi, GJ Barker, G Barr, C Barry, M Batkiewicz-Kwasniak, A Beloshapkin, F Bench, V Berardi, S Berkman, RM Berner, L Berns, S Bhadra, S Bienstock, A Blondel, S Bolognesi, S Bordoni, B Bourguille, SB Boyd, D Brailsford, A Bravar, C Bronner, MB Avanzini, J Calcutt, RG Calland, T Campbell, S Cao, SL Cartwright, R Castillo, MG Catanesi, A Cervera, A Chappell, C Checchia, D Cherdack, N Chikuma, G Christodoulou, J Coleman, G Collazuol, L Cook, D Coplowe, A Cudd, A Dabrowska, GD Rosa, T Dealtry, PF Denner, SR Dennis, C Densham, FD Lodovico, N Dokania, S Dolan, O Drapier, KE Duy, J Dumarchez, P Dunne, L Eklund, S Emery-Schrenk, A Ereditato, P Fernandez, T Feusels, AJ Finch, GA Fiorentini, G Fiorillo, C Francois, M Friend, Y Fujii, R Fujita, D Fukuda, R Fukuda, Y Fukuda, K Gameil, A Garcia, C Giganti, F Gizzarelli, T Golan, M Gonin, A Gorin, M Guigue, DR Hadley, L Haegel, JT Haigh, P Hamacher-Baumann, D Hansen, J Harada, M Hartz, T Hasegawa, NC Hastings, T Hayashino, Y Hayato, A Hillairet, T Hiraki, A Hiramoto, S Hirota, M Hogan, J Holeczek, NTH Van, F Hosomi, K Huang, F Iacob, AK Ichikawa, M Ikeda, J Imber, T Inoue, J Insler, RA Intonti, T Ishida, T Ishii, M Ishitsuka, E Iwai, K Iwamoto, A Izmaylov, B Jamieson, SJ Jenkins, C Jesus-Valls, M Jiang, S Johnson, P Jonsson, CK Jung, M Kabirnezhad, AC Kaboth, T Kajita, H Kakuno, J Kameda, D Karlen, Y Kataoka, T Katori, Y Kato, E Kearns, M Khabibullin, A Khotjantsev, H Kim, J Kim, S King, J Kisiel, A Knight, A Knox, T Kobayashi, L Koch, T Koga, PP Koller, A Konaka, LL Kormos, Y Koshio, K Kowalik, H Kubo, Y Kudenko, N Kukita, R Kurjata, T Kutter, M Kuze, L Labarga, J Lagoda, I Lamont, M Lamoureux, P Lasorak, M Laveder, M Lawe, M Licciardi, T Lindner, ZJ Liptak, RP Litcheld, SL Liu, X Li, A Longhin, JP Lopez, T Lou, L Ludovici, X Lu, T Lux, LN Machado, L Magaletti, K Mahn, M Malek, S Manly, L Maret, AD Marino, JF Martin, P Martins, S Martynenko, T Maruyama, T Matsubara, K Matsushita, V Matveev, K Mavrokoridis, WY Ma, E Mazzucato, M McCarthy, N McCauley, KS McFarland, C McGrew, A Mefodiev, C Metelko, M Mezzetto, A Minamino, O Mineev, S Mine, A Missert, M Miura, LM Bueno, S Moriyama, J Morrison, TA Mueller, L Munteanu, S Murphy, Y Nagai, T Nakadaira, M Nakahata, Y Nakajima, A Nakamura, KG Nakamura, K Nakamura, KD Nakamura, Y Nakanishi, S Nakayama, T Nakaya, K Nakayoshi, C Nantais, TV Ngoc, C Nielsen, K Niewczas, K Nishikawa, Y Nishimura, TS Nonnenmacher, F Nova, P Novella, J Nowak, JC Nugent, HM O'Keeffe, L O'Sullivan, K Okumura, T Okusawa, W Oryszczak, SMOT Ovsyannikova, RA Owen, Y Oyam, V Palladino, JL Palomino, V Paolone, WC Parker, ND Patel, P Paudyal, M Pavin, D Payne, GC Penn, YPL Pickering, C Pidcott, ESP Guerra, C Pistillo, BPK Porwit, M Posiadala-Zezula, JM Poutissou, A Pritchard, P Przewlocki, B Quilain, T Radermacher, E Radicioni, B Radics, PN Rato, MA Rayner, E Reinherz-Aronis, C Riccio, E Rondio, B Rossi, S Roth, A Rubbia, AC Ruggeri, A Rychter, K Sakashita, F Sanchez, S Sasaki, E Scantamburlo, CM Schloesser, K Scholberg, J Schwehr, M Scott, Y Seiya, T Sekiguchi, H Sekiya, D Sgalaberna, R Shah, A Shaikhiev, F Shaker, D Shaw, A Shaykina, M Shiozawa, T Shirahige, W Shorrock, A Shvartsman, A Smirnov, M Smy, JT Sobczyk, H Sobel, FJP Soler, Y Sonoda, J Steinmann, T Stewart, P Stowell, Y Suda, S Suvorov, A Suzuki, SY Suzuki, Y Suzuki, AA Sztuc, R Tacik, M Tada, A Takeda, Y Takeuchi, R Tamura, HK Tanaka, HA Tanaka, S Tanaka, T Thakore, LF Thompson, S Tobayama, W Toki, T Tomura, C Touramanis, KM Tsui, T Tsukamoto, M Tzanov, Y Uchida, W Uno, M Vagins, S Valder, Z Vallari, D Vargas, G Vasseur, C Vilela, WGS Vinning, T Vladisavljevic, VV Volkov, T Wachala, J Walker, JG Walsh, CW Walter, Y Wang, D Wark, MO Wascko, A Weber, R Wendell, MJ Wilking, C Wilkinson, JR Wilson, RJ Wilson, K Wood, C Wret, Y Yamada, K Yamamoto, S Yamasu, C Yanagisawa, G Yang, T Yano, K Yasutome, S Yen, N Yershov, M Yokoyama, T Yoshida, M Yu, A Zalewska, J Zalipska, L Zambelli, K Zaremba, G Zarnecki, M Ziembicki, ED Zimmerman, M Zito, S Zsoldos, A Zykova

We report the measurements of single and double differential cross section of muon neutrino charged-current interactions on carbon with a single positively charged pion in the final state at the T2K off-axis near detector using $5.56\times10^{20}$ protons on target. The analysis uses data control samples for the background subtraction and the cross section signal, defined as a single negatively charged muon and a single positively charged pion exiting from the target nucleus, is extracted using an unfolding method. The model dependent cross section, integrated over the T2K off-axis neutrino beam spectrum peaking at $0.6$~GeV, is measured to be $\sigma = (11.76 \pm 0.44 \text{(stat)} \pm 2.39 \text{(syst)}) \times 10^{-40} \text{cm}^2$~$\text{nucleon}^{-1}$. Various differential cross sections are measured, including the first measurement of the Adler angles for single charged pion production in neutrino interactions with heavy nuclei target.


Constraint on the Matter-Antimatter Symmetry-Violating Phase in Neutrino Oscillations

ArXiv (0)

K Abe, R Akutsu, A Ali, C Alt, C Andreopoulos, L Anthony, M Antonova, S Aoki, A Ariga, Y Asada, Y Ashida, ET Atkin, Y Awataguchi, S Ban, M Barbi, GJ Barker, G Barr, C Barry, M Batkiewicz-Kwasniak, A Beloshapkin, F Bench, V Berardi, S Berkman, L Berns, S Bhadra, S Bienstock, A Blondel, S Bolognesi, B Bourguille, SB Boyd, D Brailsford, A Bravar, DB Berguño, C Bronner, A Bubak, MB Avanzini, J Calcutt, T Campbell, S Cao, SL Cartwright, MG Catanesi, A Cervera, A Chappell, C Checchia, D Cherdack, N Chikuma, G Christodoulou, J Coleman, G Collazuol, L Cook, D Coplowe, A Cudd, A Dabrowska, GD Rosa, T Dealtry, PF Denner, SR Dennis, C Densham, FD Lodovico, N Dokania, S Dolan, O Drapier, J Dumarchez, P Dunne, L Eklund, S Emery-Schrenk, A Ereditato, P Fernandez, T Feusels, AJ Finch, GA Fiorentini, G Fiorillo, C Francois, M Friend, Y Fujii, R Fujita, D Fukuda, R Fukuda, Y Fukuda, K Gameil, C Giganti, T Golan, M Gonin, A Gorin, M Guigue, DR Hadley, JT Haigh, P Hamacher-Baumann, M Hartz, T Hasegawa, NC Hastings, T Hayashino, Y Hayato, A Hiramoto, M Hogan, J Holeczek, NTH Van, F Iacob, AK Ichikawa, M Ikeda, T Ishida, T Ishii, M Ishitsuka, K Iwamoto, A Izmaylov, B Jamieson, SJ Jenkins, C Jesús-Valls, M Jiang, S Johnson, P Jonsson, CK Jung, M Kabirnezhad, AC Kaboth, T Kajita, H Kakuno, J Kameda, D Karlen, SP Kasetti, Y Kataoka, T Katori, Y Kato, E Kearns, M Khabibullin, A Khotjantsev, T Kikawa, H Kim, J Kim, S King, J Kisiel, A Knight, A Knox, T Kobayashi, L Koch, T Koga, A Konaka, LL Kormos, Y Koshio, K Kowalik, H Kubo, Y Kudenko, N Kukita, S Kuribayashi, R Kurjata, T Kutter, M Kuze, L Labarga, J Lagoda, M Lamoureux, M Laveder, M Lawe, M Licciardi, T Lindner, RP Litchfield, SL Liu, X Li, A Longhin, L Ludovici, X Lu, T Lux, LN Machado, L Magaletti, K Mahn, M Malek, S Manly, L Maret, AD Marino, JF Martin, T Maruyama, T Matsubara, K Matsushita, V Matveev, K Mavrokoridis, E Mazzucato, M McCarthy, N McCauley, KS McFarland, C McGrew, A Mefodiev, C Metelko, M Mezzetto, A Minamino, O Mineev, S Mine, M Miura, LM Bueno, S Moriyama, J Morrison, TA Mueller, L Munteanu, S Murphy, Y Nagai, T Nakadaira, M Nakahata, Y Nakajima, A Nakamura, KG Nakamura, K Nakamura, S Nakayama, T Nakaya, K Nakayoshi, C Nantais, TV Ngoc, K Niewczas, K Nishikawa, Y Nishimura, TS Nonnenmacher, F Nova, P Novella, J Nowak, JC Nugent, HM O'Keeffe, L O'Sullivan, T Odagawa, K Okumura, T Okusawa, SM Oser, RA Owen, Y Oyama, V Palladino, JL Palomino, V Paolone, WC Parker, P Paudyal, M Pavin, D Payne, GC Penn, L Pickering, C Pidcott, G Pintaudi, ESP Guerra, C Pistillo, B Popov, K Porwit, M Posiadala-Zezula, A Pritchard, B Quilain, T Radermacher, E Radicioni, B Radics, PN Ratoff, E Reinherz-Aronis, C Riccio, E Rondio, S Roth, A Rubbia, AC Ruggeri, A Rychter, K Sakashita, F Sánchez, CM Schloesser, K Scholberg, J Schwehr, M Scott, Y Seiya, T Sekiguchi, H Sekiya, D Sgalaberna, R Shah, A Shaikhiev, F Shaker, A Shaykina, M Shiozawa, W Shorrock, A Shvartsman, A Smirnov, M Smy, JT Sobczyk, H Sobel, FJP Soler, Y Sonoda, J Steinmann, S Suvorov, A Suzuki, SY Suzuki, Y Suzuki, AA Sztuc, M Tada, M Tajima, A Takeda, Y Takeuchi, HK Tanaka, HA Tanaka, S Tanaka, LF Thompson, W Toki, C Touramanis, KM Tsui, T Tsukamoto, M Tzanov, Y Uchida, W Uno, M Vagins, S Valder, Z Vallari, D Vargas, G Vasseur, C Vilela, WGS Vinning, T Vladisavljevic, VV Volkov, T Wachala, J Walker, JG Walsh, Y Wang, D Wark, MO Wascko, A Weber, R Wendell, MJ Wilking, C Wilkinson, JR Wilson, RJ Wilson, K Wood, C Wret, Y Yamada, K Yamamoto, C Yanagisawa, G Yang, T Yano, K Yasutome, S Yen, N Yershov, M Yokoyama, T Yoshida, M Yu, A Zalewska, J Zalipska, K Zaremba, G Zarnecki, M Ziembicki, ED Zimmerman, M Zito, S Zsoldos, A Zykova

The current laws of physics do not explain the observed imbalance of matter and antimatter in the universe. Sakharov proposed that an explanation would require the violation of CP symmetry between matter and antimatter. The only CP violation observed so far is in the weak interactions of quarks, and it is too small to explain the matter-antimatter imbalance of the universe. It has been shown that CP violation in the lepton sector could generate the matter-antimatter disparity through the process called leptogenesis. The quantum mixing of neutrinos, the neutral leptons in the Standard Model, provides a potential source of CP violation through a complex phase dCP, which may have consequences for theoretical models of leptogenesis. This CP violation can be measured in muon neutrino to electron neutrino oscillations and the corresponding antineutrino oscillations, which are experimentally accessible with accelerator-produced beams as established by the T2K experiment. Until now, the value of dCP has not been significantly constrained by neutrino oscillation experiments. Here the T2K collaboration reports a measurement that favors large enhancement of the neutrino oscillation probability, excluding values of dCP which result in a large enhancement of the observed anti-neutrino oscillation probability at three standard deviations (3 sigma). The 3 sigma confidence level interval for dCP, which is cyclic and repeats every 2pi, is [-3.41,-0.03] for the so-called normal mass ordering, and [-2.54,-0.32] for the inverted mass ordering. Our results show an indication of CP violation in the lepton sector. Herein we establish methods for sensitive searches for matter-antimatter asymmetry in neutrino oscillations using accelerator-produced neutrino beams. Future measurements with larger data samples will determine whether the leptonic CP violation is larger than the quark sector CP violation.


First combined measurement of the muon neutrino and antineutrino charged-current cross section without pions in the final state at T2K

PHYSICAL REVIEW D 101 (2020) ARTN 112001

K Abe, N Akhlaq, R Akutsu, A Ali, C Alt, C Andreopoulos, L Anthony, M Antonova, S Aoki, A Ariga, T Arihara, Y Asada, Y Ashida, ET Atkin, Y Awataguchi, S Ban, M Barbi, GJ Barker, G Barr, D Barrow, C Barry, M Batkiewicz-Kwasniak, A Beloshapkin, F Bench, V Berardi, L Berns, S Bhadra, S Bienstock, A Blondel, S Bolognesi, T Bonus, B Bourguille, SB Boyd, D Brailsford, A Bravar, D Bravo Berguno, C Bronner, S Bron, A Bubak, MB Avanzini, J Calcutt, T Campbell, S Cao, SL Cartwright, MG Catanesi, A Cervera, A Chappell, C Checchia, D Cherdack, N Chikuma, G Christodoulou, M Cicerchia, J Coleman, G Collazuol, L Cook, D Coplowe, A Cudd, A Dabrowska, G De Rosa, T Dealtry, PF Denner, SR Dennis, C Densham, F Di Lodovico, N Dokania, S Dolan, TA Doyle, O Drapier, J Dumarchez, P Dunne, A Eguchi, L Eklund, S Emery-Schrenk, A Ereditato, P Fernandez, T Feusels, AJ Finch, GA Fiorentini, G Fiorillo, C Francois, M Friend, Y Fujii, R Fujita, D Fukuda, R Fukuda, Y Fukuda, K Fusshoeller, C Giganti, T Golan, M Gonin, A Gorin, M Guigue, DR Hadley, JT Haigh, P Hamacher-Baumann, M Hartz, T Hasegawa, S Hassani, NC Hastings, T Hayashino, Y Hayato, A Hiramoto, M Hogan, J Holeczek, NTH Van, T Honjo, F Iacob, AK Ichikawa, M Ikeda, T Ishida, T Ishii, M Ishitsuka, K Iwamoto, A Izmaylov, N Izumi, M Jakkapu, B Jamieson, SJ Jenkins, C Jesus-Valls, M Jiang, S Johnson, P Jonsson, CK Jung, X Junjie, PB Jurj, M Kabirnezhad, AC Kaboth, T Kajita, H Kakuno, J Kameda, D Karlen, SP Kasetti, Y Kataoka, Y Katayama, T Katori, Y Kato, E Kearns, M Khabibullin, A Khotjantsev, T Kikawa, H Kikutani, H Kim, S King, J Kisiel, A Knight, A Knox, T Kobata, T Kobayashi, L Koch, T Koga, A Konaka, LL Kormos, Y Koshio, A Kostin, K Kowalik, H Kubo, Y Kudenko, N Kukita, S Kuribayashi, R Kurjata, T Kutter, M Kuze, L Labarga, J Lagoda, M Lamoureux, D Last, M Laveder, M Lawe, M Licciardi, T Lindner, RP Litchfield, SL Liu, X Li, A Longhin, L Ludovici, X Lu, T Lux, LN Machado, L Magaletti, K Mahn, M Malek, S Manly, L Maret, AD Marino, L Marti-Magro, JF Martin, T Maruyama, T Matsubara, K Matsushita, V Matveev, C Mauger, K Mavrokoridis, E Mazzucato, M McCarthy, N McCauley, J McElwee, KS McFarland, C McGrew, A Mefodiev, C Metelko, M Mezzetto, A Minamino, O Mineev, S Mine, M Miura, LM Bueno, S Moriyama, J Morrison, TA Mueller, L Munteanu, S Murphy, Y Nagai, T Nakadaira, M Nakahata, Y Nakajima, A Nakamura, KG Nakamura, K Nakamura, S Nakayama, T Nakaya, K Nakayoshi, C Nantais, CER Naseby, TV Ngoc, K Niewczas, K Nishikawa, Y Nishimura, TS Nonnenmacher, F Nova, P Novella, J Nowak, JC Nugent, HM O'Keeffe, L O'Sullivan, T Odagawa, T Ogawa, R Okada, K Okumura, T Okusawa, SM Oser, RA Owen, Y Oyama, V Palladino, JL Palomino, V Paolone, WC Parker, S Parsa, J Pasternak, P Paudyal, M Pavin, D Payne, GC Penn, L Pickering, C Pidcott, G Pintaudi, ESP Guerra, C Pistillo, B Popov, K Porwit, M Posiadala-Zezula, A Pritchard, B Quilain, T Radermacher, E Radicioni, B Radics, PN Ratoff, E Reinherz-Aronis, C Riccio, E Rondio, S Roth, A Rubbia, AC Ruggeri, C Ruggles, A Rychter, K Sakashita, F Sanchez, G Santucci, CM Schloesser, K Scholberg, J Schwehr, M Scott, Y Seiya, T Sekiguchi, H Sekiya, D Sgalaberna, R Shah, A Shaikhiev, F Shaker, A Shaykina, M Shiozawa, W Shorrock, A Shvartsman, A Smirnov, M Smy, JT Sobczyk, H Sobel, FJP Soler, Y Sonoda, J Steinmann, S Suvorov, A Suzuki, SY Suzuki, Y Suzuki, AA Sztuc, M Tada, M Tajima, A Takeda, Y Takeuchi, HK Tanaka, HA Tanaka, S Tanaka, Y Tanihara, N Teshima, LF Thompson, W Toki, C Touramanis, T Towstego, KM Tsui, T Tsukamoto, M Tzanov, Y Uchida, M Vagins, S Valder, Z Vallari, D Vargas, G Vasseur, C Vilela, WGS Vinning, T Vladisavljevic, VV Volkov, T Wachala, J Walker, JG Walsh, Y Wang, D Wark, MO Wascko, A Weber, R Wendell, MJ Wilking, C Wilkinson, JR Wilson, RJ Wilson, K Wood, C Wret, Y Yamada, K Yamamoto, C Yanagisawa, G Yang, T Yano, K Yasutome, S Yen, N Yershov, M Yokoyama, T Yoshida, M Yu, A Zalewska, J Zalipska, K Zaremba, G Zarnecki, M Ziembicki, ED Zimmerman, M Zito, S Zsoldos, A Zykova, T Collaboration


Search for heavy neutral leptons decaying into muon-pion pairs in the MicroBooNE detector

PHYSICAL REVIEW D 101 (2020) ARTN 052001

P Abratenko, M Alrashed, R An, J Anthony, J Asaadi, A Ashkenazi, S Balasubramanian, B Baller, C Barnes, G Barr, V Basque, S Berkman, A Bhanderi, A Bhat, M Bishai, A Blake, T Bolton, L Camilleri, D Caratelli, IC Terrazas, RC Fernandez, F Cavanna, G Cerati, Y Chen, E Church, D Cianci, EO Cohen, JM Conrad, M Convery, L Cooper-Troendle, JI Crespo-Anadon, M Del Tutto, D Devitt, L Domine, K Duffy, S Dytman, B Eberly, A Ereditato, LE Sanchez, JJ Evans, RS Fitzpatrick, BT Fleming, N Foppiani, D Franco, AP Furmanski, D Garcia-Gamez, S Gardiner, V Genty, D Goeldi, S Gollapinni, O Goodwin, E Gramellini, P Green, H Greenlee, L Gu, W Gu, R Guenette, P Guzowski, P Hamilton, O Hen, C Hill, GA Horton-Smith, A Hourlier, E-C Huang, R Itay, C James, JJ de Vries, X Ji, L Jiang, JH Jo, RA Johnson, J Joshi, Y-J Jwa, G Karagiorgi, W Ketchum, B Kirby, M Kirby, T Kobilarcik, I Kreslo, R LaZur, I Lepetic, Y Li, A Lister, BR Littlejohn, S Lockwitz, D Lorca, WC Louis, M Luethi, B Lundberg, X Luo, A Marchionni, S Marcocci, C Mariani, J Marshall, J Martin-Albo, DAM Caicedo, K Mason, A Mastbaum, N McConkey, V Meddage, T Mettler, K Miller, J Mills, K Mistry, A Mogan, T Mohayai, J Moon, M Mooney, CD Moore, J Mousseau, R Murrells, D Naples, RK Neely, P Nienaber, J Nowak, O Palamara, V Pandey, V Paolone, A Papadopoulou, V Papavassiliou, SF Pate, A Paudel, Z Pavlovic, E Piasetzky, D Porzio, S Prince, G Pulliam, X Qian, JL Raaf, V Radeka, A Rafique, L Ren, L Rochester, HE Rogers, M Ross-Lonergan, CR von Rohr, B Russell, G Scanavini, DW Schmitz, A Schukraft, W Seligman, MH Shaevitz, R Sharankova, J Sinclair, A Smith, EL Snider, M Soderberg, S Soldner-Rembold, SR Soleti, P Spentzouris, J Spitz, M Stancari, J St John, T Strauss, K Sutton, S Sword-Fehlberg, AM Szelc, N Tagg, W Tang, K Terao, RT Thornton, M Toups, Y-T Tsai, S Tufanli, MA Uchida, T Usher, W Van De Pontseele, RG Van de Water, B Viren, M Weber, H Wei, DA Wickremasinghe, Z Williams, S Wolbers, T Wongjirad, K Woodruff, M Wospakrik, W Wu, T Yang, G Yarbrough, LE Yates, GP Zeller, J Zennamo, C Zhang, M Collaboration


Nuclear binding energy and transverse momentum imbalance in neutrino-nucleus reaction

arxiv (2019)
Part of a series from Arxiv

F Akbar, DA Andrade, MV Ascencio, L Bellantoni, A Bodek, JL Bonilla, MF Carneiro, D Coplowe, A Filkins, H Gallagher, A Ghosh, R Gran, DA Harris, S Henry, S Jena, J Kleykamp, M Kordosky, T Le, A Lozano, E Maher, S Manly, WA Mann, A Olivier, V Paolone

Observables based on the final state kinematic imbalances are measured in the mesonless production of $\nu_\mu+A\rightarrow\mu^-+p+X$ in the MINERvA tracker. Components of the muon-proton momentum imbalances parallel ($\delta p_{Ty}$) and perpendicular($\delta p_{Tx}$) to the momentum transfer in the transverse plane are found to be sensitive to the nuclear effects such as Fermi motion, binding energy and non-QE contributions. The QE peak location in $\delta p_{Ty}$ is particularly sensitive to the binding energy. Differential cross sections are compared to predictions from different neutrino interaction models. None of the Fermi gas models simultaneously describe every feature of the QE peak width, location, and non-QE contribution to the signal process. Correcting the GENIE's binding energy implementation according to theory causes better agreement with data. Hints of proton left-right asymmetry is observed in $\delta p_{Tx}$. Better modelling of the binding energy can reduce bias in neutrino energy reconstruction and these observables can be applied in current and future experiments to better constrain nuclear effects.


Calibration of the charge and energy loss per unit length of the MicroBooNE liquid argon time projection chamber using muons and protons

JOURNAL OF INSTRUMENTATION 15 (2020) ARTN P03022

C Adams, M Alrashed, R An, J Anthony, J Asaadi, A Ashkenazi, S Balasubramanian, B Baller, C Barnes, G Barr, V Basque, M Bass, F Bay, S Berkman, A Bhanderi, A Bhat, M Bishai, A Blake, T Bolton, L Camilleri, D Caratelli, IC Terrazas, R Carr, RC Fernandez, F Cavanna, G Cerati, Y Chen, E Church, D Cianci, EO Cohen, JM Conrad, M Convery, L Cooper-Troendle, JI Crespo-Anadon, M Del Tutto, D Devitt, A Diaz, L Domine, K Duffy, S Dytman, B Eberly, A Ereditato, LE Sanchez, J Esquivel, JJ Evans, RS Fitzpatrick, BT Fleming, N Foppiani, D Franco, AP Furmanski, D Garcia-Gamez, S Gardiner, V Genty, D Goeldi, S Gollapinni, O Goodwin, E Gramellini, P Green, H Greenlee, R Grosso, L Gu, W Gu, R Guenette, P Guzowski, P Hamilton, O Hen, C Hill, GA Horton-Smith, A Hourlier, EC Huang, R Itay, C James, JJ de Vries, X Ji, L Jiang, JH Jo, RA Johnson, J Joshi, YJ Jwa, G Karagiorgi, W Ketchum, B Kirby, M Kirby, T Kobilarcik, I Kreslo, I Lepetic, Y Li, A Lister, BR Littlejohn, S Lockwitz, D Lorca, WC Louis, M Luethi, B Lundberg, X Luo, A Marchionni, S Marcocci, C Mariani, J Marshall, J Martin-Albo, DAM Caicedo, K Mason, A Mastbaum, N McConkey, V Meddage, T Mettler, K Miller, J Mills, K Mistry, A Mogan, T Mohayai, J Moon, M Mooney, CD Moore, J Mousseau, M Murphy, R Murrells, D Naples, RK Neely, P Nienaber, J Nowak, O Palamara, V Pandey, V Paolone, A Papadopoulou, V Papavassiliou, SF Pate, A Paudel, Z Pavlovic, E Piasetzky, D Porzio, S Prince, G Pulliam, X Qian, J Raaf, A Rafique, L Ren, L Rochester, HE Rogers, M Ross-Lonergan, CR von Rohr, B Russell, G Scanavini, DW Schmitz, A Schukraft, W Seligman, MH Shaevitz, R Sharankova, J Sinclair, A Smith, EL Snider, M Soderberg, S Soldner-Rembold, S Soleti, P Spentzouris, J Spitz, M Stancari, J St John, T Strauss, K Sutton, S Sword-Fehlberg, AM Szelc, N Tagg, W Tang, K Terao, RT Thornton, M Toups, Y-T Tsai, S Tufanli, T Usher, W Van De Pontseele, RG Van de Water, B Viren, M Weber, H Wei, DA Wickremasinghe, Z Williams, S Wolbers, T Wongjirad, K Woodruff, M Wospakrik, W Wu, T Yang, G Yarbrough, LE Yates, GP Zeller, J Zennamo, C Zhang, M Collaboration


Measurement of ¯ ν μ charged-current single π − production on hydrocarbon in the few-GeV region using MINERvA

Physical Review D American Physical Society 100 (2019) 052008

T Le, F Akbar, L Aliaga, DA Andrade, MV Ascencio, A Bashyal, A Bercellie, M Betancourt, A Bodek, JL Bonilla, A Bravar, H Budd, G Caceres, T Cai, MF Carneiro, D Coplowe, GA Diaz, J Felix, L Fields, A Filkins, R Fine, N Fiza, AM Gago, H Gallagher

The antineutrino scattering channel ¯ ν μ CH → μ + π − X (nucleon(s)) is analyzed in the incident energy range 1.5 to 10 GeV using the MINERvA detector at Fermilab. Differential cross sections are reported as functions of μ + momentum and production angle, π − kinetic energy and production angle, and antineutrino energy and squared four-momentum transfer. Distribution shapes are generally reproduced by simulations based on the GENIE, NuWro, and GiBUU event generators, however GENIE (GiBUU) overestimates (underestimates) the cross section normalizations by 8% (10%). Comparisons of data with the GENIE-based reference simulation probe conventional treatments of cross sections and pion intranuclear rescattering. The distribution of nontrack vertex energy is used to decompose the signal sample into reaction categories, and cross sections are determined for the exclusive reactions μ + π − n and μ + π − p . A similar treatment applied to the published MINERvA sample ¯ ν μ CH → μ + π 0 X [nucleon(s)] has determined the μ + π 0 n cross section, and the latter is used with σ ( π − n ) and σ ( π − p ) to carry out an isospin decomposition of ¯ ν μ -induced CC ( π ) . The ratio of magnitudes and relative phase for isospin amplitudes A 3 and A 1 thereby obtained are: R ¯ ν = 0.99 ± 0.19 and ϕ ¯ ν = 9 3 ° ± 7 ° . Our results are in agreement with bubble chamber measurements made four decades ago.


Neutron measurements from antineutrino hydrocarbon reactions

Physical Review D American Physical Society 100 (2019) 052002

M Elkins, T Cai, J Chaves, J Kleykamp, F Akbar, L Albin, L Aliaga, DA Andrade, MV Ascencio, A Bashyal, L Bellantoni, A Bercellie, M Betancourt, A Bodek, A Bravar, H Budd, G Caceres, MF Carneiro, D Coplowe, H Da Motta, GA Diaz, J Felix, L Fields, A Filkins

Charged-current antineutrino interactions on a hydrocarbon scintillator in the MINERvA detector are used to study activity from their final-state neutrons. To ensure that most of the neutrons are from the primary interaction, rather than hadronic reinteractions in the detector, the sample is limited to momentum transfers below 0.8 GeV/c. From 16 129 interactions, 15 246 neutral particle candidates are observed. The reference simulation predicts 64% of these candidates are due to neutrons from the antineutrino interaction directly but also overpredicts the number of candidates by 15% overall. This discrepancy is beyond the standard uncertainty estimates for models of neutrino interactions and neutron propagation in the detector. We explore these two aspects of the models using the measured distributions for energy deposition, time of flight, position, and speed. We also use multiplicity distributions to evaluate the presence of a two-nucleon knockout process. These results provide critical new information toward a complete description of the hadronic final state of neutrino interactions, which is vital to neutrino oscillation experiments.


Constraint of the MINERνA medium energy neutrino flux using neutrino-electron elastic scattering

Physical Review D American Physical Society 100 (2019) 092001

E Valencia, D Jena, D Coplowe, X Lu


Sensitivity of Super-Kamiokande with gadolinium to low energy antineutrinos from pre-supernova emission

Astrophysical Journal American Astronomical Society 885 (2019) 133

C Simpson, K Abe, M Ikeda, H Ito, K Iyogi, J Kameda, Y Kataoka, Y Kato, Y Kishimoto, T Mochizuki, G Pronost, H Sekiya, A Takenaka, K Okumura, D Bravo-Berguno, P Fernandez, FDM Blaszczyk, C Kachulis, S Sussman, S Berkman, J Bian, NJ Griskevich, WR Kropp, S Locke, D Wark

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.


Tuning the GENIE pion production model with MINERvA data

Physical Review D American Physical Society 100 (2019) 072005

P Stowell, L Pickering, C Willkinson, C Wret, F Akbar, DA Andrade, MV Ascencio, L Bellantoni, A Bercellie, M Betancourt, A Bodek, A Bravar, H Budd, G Caceres, T Cai, MF Cameiro, J Chaves, H Da Motta, GA Diaz, J Felix, L Fields, A Filkins, R Fine, N Fiza

Faced with unresolved tensions between neutrino interaction measurements at few-GeV neutrino energies, current experiments are forced to accept large systematic uncertainties to cover discrepancies between their data and model predictions. The widely used pion production model in genie is compared to four MINERνA charged current pion production measurements using nuisance. Tunings, i.e., adjustments of model parameters, to help match genie to MINERνA and older bubble chamber data are presented. We find that scattering off nuclear targets as measured in MINERνA is not in good agreement with expectations based upon scattering off nucleon (hydrogen or deuterium) targets in existing bubble chamber data. An additional ad hoc correction for the low-Q2 region, where collective nuclear effects are expected to be large, is presented. While these tunings and corrections improve the agreement of genie with the data, the modeling is imperfect. The development of these tunings within the nuisance framework allows for straightforward extensions to other neutrino event generators and models, and allows omitting and including new datasets as they become available.


Search for heavy neutrinos with the T2K near detector ND280

Phys. Rev. D100 (2019) 5

K Abe, others


First measurement of inclusive muon neutrino charged current differential cross sections on argon at Eν∼0.8  GeV with the MicroBooNE detector

Physical Review Letters American Physical Society 123 (2019) 131801

M Bass, F Bay, A Bhat, F Cavanna, G Cerati, Y Chen, E Church, D Cianci, EO Cohen, GH Collin, JM Conrad, M Convery, L Cooper-Troendle, JI Crespo-Anadón, M Del Tutto, D Devitt, A Diaz, B Eberly, A Ereditato, L Escudero Sanchez, AP Furmanski, D Garcia-Gamez, D Goeldi, S Gollapinni, O Goodwin

We report the first measurement of the double-differential and total muon-neutrino charged-current inclusive cross sections on argon at a mean neutrino energy of 0.8 GeV. Data were collected using the MicroBooNE liquid argon time projection chamber located in the Fermilab Booster neutrino beam, and correspond to $1.6 \times 10^{20}$ protons on target of exposure. The measured differential cross sections are presented as a function of muon momentum, using multiple Coulomb scattering as a momentum measurement technique, and the muon angle with respect to the beam direction. We compare the measured cross sections to multiple neutrino event generators and find better agreement with those containing more complete physics at low $Q^2$. The total flux integrated cross section is measured to be $0.693 \pm 0.010 \, (\text{stat.}) \pm 0.165 \, (\text{syst.}) \times 10^{-38} \, \text{cm}^{2}$.


Commissioning and Operation of the Readout System for the SoLid Neutrino Detector

Journal of Instrumentation IOP Publishing (2019)

Y Abreu, Y Amhis, G Ban, W Beaumont, S Binet, M Bongrand, D Boursette, BC Castle, H Chanal, K Clark, B Coupé, P Crochet, D Cussans, AD Roeck, D Durand, M Fallot, L Ghys, L Giot, K Graves, B Guillon, D Henaff, B Hosseini, S Ihantola, S Jenzer, S Kalcheva, LN Kalousis, M Labare, G Lehaut, S Manley, L Manzanillas, J Mermans, I Michiels, S Monteil, C Moortgat, D Newbold, J Park, V Pestel, K Petridis, I Piñera, L Popescu, D Ryckbosch, N Ryder, D Saunders, M-H Schune, M Settimo, L Simard, A Vacheret, G Vandierendonck, SV Dyck, PV Mulders, NV Remortel, S Vercaemer, M Verstraeten, B Viaud, A Weber, F Yermia

The SoLid experiment aims to measure neutrino oscillation at a baseline of 6.4 m from the BR2 nuclear reactor in Belgium. Anti-neutrinos interact via inverse beta decay (IBD), resulting in a positron and neutron signal that are correlated in time and space. The detector operates in a surface building, with modest shielding, and relies on extremely efficient online rejection of backgrounds in order to identify these interactions. A novel detector design has been developed using 12800 5 cm cubes for high segmentation. Each cube is formed of a sandwich of two scintillators, PVT and 6LiF:ZnS(Ag), allowing the detection and identification of positrons and neutrons respectively. The active volume of the detector is an array of cubes measuring 80x80x250 cm (corresponding to a fiducial mass of 1.6 T), which is read out in layers using two dimensional arrays of wavelength shifting fibres and silicon photomultipliers, for a total of 3200 readout channels. Signals are recorded with 14 bit resolution, and at 40 MHz sampling frequency, for a total raw data rate of over 2 Tbit/s. In this paper, we describe a novel readout and trigger system built for the experiment, that satisfies requirements on: compactness, low power, high performance, and very low cost per channel. The system uses a combination of high price-performance FPGAs with a gigabit Ethernet based readout system, and its total power consumption is under 1 kW. The use of zero suppression techniques, combined with pulse shape discrimination trigger algorithms to detect neutrons, results in an online data reduction factor of around 10000. The neutron trigger is combined with a large per-channel history time buffer, allowing for unbiased positron detection. The system was commissioned in late 2017, with successful physics data taking established in early 2018.


Pion-proton correlation in neutrino interactions on nuclei

Physical Review D American Physical Society 100 (2019) 073010

T Cai, X Lu, D Ruterbories

In neutrino-nucleus interactions, a proton produced with a correlated pion might exhibit a left-right asymmetry relative to the lepton scattering plane even when the pion is absorbed. Absent in other proton production mechanisms, such an asymmetry measured in charged-current pionless production could reveal the details of the absorbed-pion events that are otherwise inaccessible. In this study, we demonstrate the idea of using final-state proton left-right asymmetries to quantify the absorbed-pion event fraction and underlying kinematics. This technique might provide critical information that helps constrain all underlying channels in neutrino-nucleus interactions in the GeV regime.


Measurement of neutrino and antineutrino neutral-current quasielastic-like interactions on oxygen by detecting nuclear de-excitation $γ$-rays

Physical Review D: Particles, Fields, Gravitation and Cosmology American Physical Society (2019)

K Abe, R Akutsu, A Ali, C Alt, C Andreopoulos, L Anthony, M Antonova, S Aoki, A Ariga, Y Ashida, ET Atkin, Y Awataguchi, S Ban, M Barbi, GJ Barker, G Barr, C Barry, M Batkiewicz-Kwasniak, A Beloshapkin, F Bench, V Berardi, S Berkman, L Berns, S Bhadra, S Bienstock, A Blondel, S Bolognesi, B Bourguille, SB Boyd, D Brailsford, A Bravar, DB Berguño, C Bronner, A Bubak, MB Avanzini, J Calcutt, T Campbell, S Cao, SL Cartwright, MG Catanesi, A Cervera, A Chappell, C Checchia, D Cherdack, N Chikuma, G Christodoulou, J Coleman, G Collazuol, L Cook, D Coplowe, A Cudd, A Dabrowska, GD Rosa, T Dealtry, PF Denner, SR Dennis, C Densham, FD Lodovico, N Dokania, S Dolan, O Drapier, J Dumarchez, P Dunne, L Eklund, S Emery-Schrenk, A Ereditato, P Fernandez, T Feusels, AJ Finch, GA Fiorentini, G Fiorillo, C Francois, M Friend, Y Fujii, R Fujita, D Fukuda, R Fukuda, Y Fukuda, K Gameil, C Giganti, T Golan, M Gonin, A Gorin, M Guigue, DR Hadley, JT Haigh, P Hamacher-Baumann, M Hartz, T Hasegawa, NC Hastings, T Hayashino, Y Hayato, A Hiramoto, M Hogan, J Holeczek, NTH Van, F Iacob, AK Ichikawa, M Ikeda, T Ishida, T Ishii, M Ishitsuka, K Iwamoto, A Izmaylov, B Jamieson, SJ Jenkins, C Jesús-Valls, M Jiang, S Johnson, P Jonsson, CK Jung, M Kabirnezhad, AC Kaboth, T Kajita, H Kakuno, J Kameda, D Karlen, SP Kasetti, Y Kataoka, T Katori, Y Kato, E Kearns, M Khabibullin, A Khotjantsev, T Kikawa, H Kim, J Kim, S King, J Kisiel, A Knight, A Knox, T Kobayashi, L Koch, T Koga, A Konaka, LL Kormos, Y Koshio, K Kowalik, H Kubo, Y Kudenko, N Kukita, S Kuribayashi, R Kurjata, T Kutter, M Kuze, L Labarga, J Lagoda, M Lamoureux, M Laveder, M Lawe, M Licciardi, T Lindner, RP Litchfield, SL Liu, X Li, A Longhin, L Ludovici, X Lu, T Lux, LN Machado, L Magaletti, K Mahn, M Malek, S Manly, L Maret, AD Marino, JF Martin, T Maruyama, T Matsubara, K Matsushita, V Matveev, K Mavrokoridis, E Mazzucato, M McCarthy, N McCauley, KS McFarland, C McGrew, A Mefodiev, C Metelko, M Mezzetto, A Minamino, O Mineev, S Mine, M Miura, LM Bueno, S Moriyama, J Morrison, TA Mueller, L Munteanu, S Murphy, Y Nagai, T Nakadaira, M Nakahata, Y Nakajima, A Nakamura, KG Nakamura, K Nakamura, S Nakayama, T Nakaya, K Nakayoshi, C Nantais, TV Ngoc, K Niewczas, K Nishikawa, Y Nishimura, TS Nonnenmacher, F Nova, P Novella, J Nowak, JC Nugent, HM O'Keeffe, L O'Sullivan, T Odagawa, K Okumura, T Okusawa, SM Oser, RA Owen, Y Oyama, V Palladino, JL Palomino, V Paolone, WC Parker, P Paudyal, M Pavin, D Payne, GC Penn, L Pickering, C Pidcott, ESP Guerra, C Pistillo, B Popov, K Porwit, M Posiadala-Zezula, A Pritchard, B Quilain, T Radermacher, E Radicioni, B Radics, PN Ratoff, E Reinherz-Aronis, C Riccio, E Rondio, S Roth, A Rubbia, AC Ruggeri, A Rychter, K Sakashita, F Sánchez, CM Schloesser, K Scholberg, J Schwehr, M Scott, Y Seiya, T Sekiguchi, H Sekiya, D Sgalaberna, R Shah, A Shaikhiev, F Shaker, A Shaykina, M Shiozawa, W Shorrock, A Shvartsman, A Smirnov, M Smy, JT Sobczyk, H Sobel, FJP Soler, Y Sonoda, J Steinmann, S Suvorov, A Suzuki, SY Suzuki, Y Suzuki, AA Sztuc, M Tada, M Tajima, A Takeda, Y Takeuchi, HK Tanaka, HA Tanaka, S Tanaka, LF Thompson, W Toki, C Touramanis, KM Tsui, T Tsukamoto, M Tzanov, Y Uchida, W Uno, M Vagins, S Valder, Z Vallari, D Vargas, G Vasseur, C Vilela, WGS Vinning, T Vladisavljevic, VV Volkov, T Wachala, J Walker, JG Walsh, Y Wang, D Wark, MO Wascko, A Weber, R Wendell, MJ Wilking, C Wilkinson, JR Wilson, RJ Wilson, K Wood, C Wret, Y Yamada, K Yamamoto, C Yanagisawa, G Yang, T Yano, K Yasutome, S Yen, N Yershov, M Yokoyama, T Yoshida, M Yu, A Zalewska, J Zalipska, K Zaremba, G Zarnecki, M Ziembicki, ED Zimmerman, M Zito, S Zsoldos, A Zykova

Neutrino- and antineutrino-oxygen neutral-current quasielastic-like interactions are measured at Super-Kamiokande using nuclear de-excitation $\gamma$-rays to identify signal-like interactions in data from a $14.94 \ (16.35)\times 10^{20}$ protons-on-target exposure of the T2K neutrino (antineutrino) beam. The measured flux-averaged cross sections on oxygen nuclei are $\langle \sigma_{\nu {\rm -NCQE}} \rangle = 1.70 \pm 0.17 ({\rm stat.}) ^{+ {\rm 0.51}}_{- {\rm 0.38}} ({\rm syst.}) \times 10^{-38} \ {\rm cm^2/oxygen}$ with a flux-averaged energy of 0.82 GeV and $\langle \sigma_{\bar{\nu} {\rm -NCQE}} \rangle = 0.98 \pm 0.16 ({\rm stat.}) ^{+ {\rm 0.26}}_{- {\rm 0.19}} ({\rm syst.}) \times 10^{-38} \ {\rm cm^2/oxygen}$ 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.

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