Measurement of neutrino and antineutrino oscillations by the T2K experiment including a new additional sample of $ν_e$ interactions at the far detector
K. Abe, J. Amey, C. Andreopoulos, M. Antonova, S. Aoki, A. Ariga, Y. Ashida, S. Ban, M. Barbi, G. J. Barker, G. Barr, C. Barry, M. Batkiewicz, V. Berardi, S. Be… 展开作者
K. Abe, J. Amey, C. Andreopoulos, M. Antonova, S. Aoki, A. Ariga, Y. Ashida, S. Ban, M. Barbi, G. J. Barker, G. Barr, C. Barry, M. Batkiewicz, V. Berardi, S. Berkman, S. Bhadra, S. Bienstock, A. Blondel, S. Bolognesi, S. Bordoni, S. B. Boyd, D. Brailsford, A. Bravar, C. Bronner, M. Buizza Avanzini, R. G. Calland, T. Campbell, S. Cao, S. L. Cartwright, M. G. Catanesi, A. Cervera, A. Chappell, C. Checchia, D. Cherdack, N. Chikuma, G. Christodoulou, J. Coleman, G. Collazuol, D. Coplowe, A. Cudd, A. Dabrowska, G. De Rosa, T. Dealtry, P. F. Denner, S. R. Dennis, C. Densham, F. Di Lodovico, S. Dolan, O. Drapier, K. E. Duffy, J. Dumarchez, P. Dunne, S. Emery-Schrenk, A. Ereditato, T. Feusels, A. J. Finch, G. A. Fiorentini, M. Friend, Y. Fujii, D. Fukuda, Y. Fukuda, A. Garcia, C. Giganti, F. Gizzarelli, T. Golan, M. Gonin, D. R. Hadley, L. Haegel, J. T. Haigh, D. Hansen, J. Harada, M. Hartz, T. Hasegawa, N. C. Hastings, T. Hayashino, Y. Hayato, A. Hillairet, T. Hiraki, A. Hiramoto, S. Hirota, M. Hogan, J. Holeczek, F. Hosomi, K. Huang, A. K. Ichikawa, M. Ikeda, J. Imber, J. Insler, R. A. Intonti, T. Ishida, T. Ishii, E. Iwai, K. Iwamoto, A. Izmaylov, B. Jamieson, M. Jiang, S. Johnson, P. Jonsson, C. K. Jung, M. Kabirnezhad, A. C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, D. Karlen, T. Katori, E. Kearns, M. Khabibullin, A. Khotjantsev, H. Kim, J. Kim, S. King, J. Kisiel, A. Knight, A. Knox, T. Kobayashi, L. Koch, T. Koga, P. P. Koller, A. Konaka, L. L. Kormos, Y. Koshio, K. Kowalik, Y. Kudenko, R. Kurjata, T. Kutter, J. Lagoda, I. Lamont, M. Lamoureux, P. Lasorak, M. Laveder, M. Lawe, M. Licciardi, T. Lindner, Z. J. Liptak, R. P. Litchfield, X. Li, A. Longhin, J. P. Lopez, T. Lou, L. Ludovici, X. Lu, L. Magaletti, K. Mahn, M. Malek, S. Manly, L. Maret, A. D. Marino, J. F. Martin, P. Martins, S. Martynenko, T. Maruyama, V. Matveev, K. Mavrokoridis, W. Y. Ma, E. Mazzucato, M. McCarthy, N. McCauley, K. S. McFarland, C. McGrew, A. Mefodiev, C. Metelko, M. Mezzetto, A. Minamino, O. Mineev, S. Mine, A. Missert, M. Miura, S. Moriyama, J. Morrison, Th. A. Mueller, T. Nakadaira, M. Nakahata, K. G. Nakamura, K. Nakamura, K. D. Nakamura, Y. Nakanishi, S. Nakayama, T. Nakaya, K. Nakayoshi, C. Nantais, C. Nielsen, K. Nishikawa, Y. Nishimura, P. Novella, J. Nowak, H. M. O'Keeffe, K. Okumura, T. Okusawa, W. Oryszczak, S. M. Oser, T. Ovsyannikova, R. A. Owen, Y. Oyama, V. Palladino, J. L. Palomino, V. Paolone, N. D. Patel, P. Paudyal, M. Pavin, D. Payne, Y. Petrov, L. Pickering, E. S. Pinzon Guerra, C. Pistillo, B. Popov, M. Posiadala-Zezula, J. -M. Poutissou, A. Pritchard, P. Przewlocki, B. Quilain, T. Radermacher, E. Radicioni, P. N. Ratoff, M. A. Rayner, E. Reinherz-Aronis, C. Riccio, P. A. Rodrigues, E. Rondio, B. Rossi, S. Roth, A. C. Ruggeri, A. Rychter, K. Sakashita, F. Sánchez, E. Scantamburlo, K. Scholberg, J. Schwehr, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, R. Shah, A. Shaikhiev, F. Shaker, D. Shaw, M. Shiozawa, T. Shirahige, M. Smy, J. T. Sobczyk, H. Sobel, J. Steinmann, T. Stewart, P. Stowell, Y. Suda, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, R. Tacik, M. Tada, A. Takeda, Y. Takeuchi, R. Tamura, H. K. Tanaka, H. A. Tanaka, T. Thakore, L. F. Thompson, S. Tobayama, W. Toki, T. Tomura, T. Tsukamoto, M. Tzanov, M. Vagins, Z. Vallari, G. Vasseur, C. Vilela, T. Vladisavljevic, T. Wachala, C. W. Walter, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, R. J. Wilson, C. Wret, Y. Yamada, K. Yamamoto, C. Yanagisawa, T. Yano, S. Yen, N. Yershov, M. Yokoyama, M. Yu, A. Zalewska, J. Zalipska, L. Zambelli, K. Zaremba, M. Ziembicki, E. D. Zimmerman, M. Zito
T2 K实验报告了中微子和反中微子振荡出现和消失通道的最新分析。在超级神冈的电子中微子候选者的样本中，一个π衰变已被标记添加到四个单环样品中使用的以前的T2 K振荡分析。通过对这五个样品的联合分析，同时测量了四个振荡参数$|Δm^2_{32}|$、$\sin^2(θ_{23})$、$\sin^2(θ_{13})$和$δ_{CP}$以及质量排序。一组模拟数据的研究表明，振荡参数的灵敏度不受中微子相互作用模型的不确定性。进行多振荡分析，频率和贝叶斯区间的振荡参数的组合，包括和不包括反应堆的限制$\sin^2(θ_{13})$。当与反应堆测量相结合时，CP守恒假设（$δ_{CP}$、$=0$或$π$）在90%置信水平下被排除。对于正态（反向）排序，$δ_{CP}$的90%置信区间为[-2.95，-0.44]（[-1.47，-1.27]）。正常（倒置）排序的其他振荡参数的中心值和68\%置信区间是$Δm^{2}_{32}=2.54\pm0.08$（$2.51\pm0.08$）$\times 10^{-3}$ eV $^2 / c^4$和$\sin^2(θ_{23}) = 0.55^{+0.05}_{-0.09}$（$0.55^{+0.05}_{-0.08}$），与最大混合兼容。在贝叶斯分析中，数据弱偏好正态排序（贝叶斯因子3.7）和$\sin^2(θ_{23})$的上八分圆（贝叶斯因子2.4）。
英文摘要：
The T2K experiment reports an updated analysis of neutrino and antineutrino oscillations in appearance and disappearance channels. A sample of electron neutrino candidates at Super-Kamiokande in which a pion decay has been tagged is added to the four single-ring samples used in previous T2K oscillation analyses. Through combined analyses of these five samples, simultaneous measurements of four oscillation parameters, $|Δm^2_{32}|$, $\sin^2(θ_{23})$, $\sin^2(θ_{13})$, and $δ_{CP}$ and of the mass ordering are made. A set of studies of simulated data indicates that the sensitivity to the oscillation parameters is not limited by neutrino interaction model uncertainty. Multiple oscillation analyses are performed, and frequentist and Bayesian intervals are presented for combinations of the oscillation parameters with and without the inclusion of reactor constraints on $\sin^2(θ_{13})$. When combined with reactor measurements, the hypothesis of CP conservation ($δ_{CP}$$=0$ or $π$) is excluded at 90% confidence level. The 90% confidence region for $δ_{CP}$ is [-2.95,-0.44] ([-1.47, -1.27]) for normal (inverted) ordering. The central values and 68\% confidence intervals for the other oscillation parameters for normal (inverted) ordering are $Δm^{2}_{32}=2.54\pm0.08$ ($2.51\pm0.08$) $\times 10^{-3}$ eV$^2 / c^4$ and $\sin^2(θ_{23}) = 0.55^{+0.05}_{-0.09}$ ($0.55^{+0.05}_{-0.08}$), compatible with maximal mixing. In the Bayesian analysis, the data weakly prefer normal ordering (Bayes factor 3.7) and the upper octant for $\sin^2(θ_{23})$ (Bayes factor 2.4).
Muon antineutrino charged-current cross sections without pions in the final state at T2K
T2 K（Tokai to Kamioka）是位于日本的长基线中微子振荡实验，旨在使用离轴中微子束测量中微子味振荡。最近收集的数据与反中微子束允许T2 K测量截面的反中微子在能量约600兆电子伏使用离轴近探测器。这些测量，以及中微子的类似测量，是中微子振荡分析和解释的重要输入。在这项工作中的μ介子中微子和反中微子的带电电流截面的同时提取的初步结果，没有π介子在末态。这两个截面将作为μ子运动学的函数进行测量，以评估两个截面之间的和、差和不对称性。这些结果对于比较和调整多核子相互作用（也称为2粒子2空穴过程）等核效应的理论模型是有用的。
Intensive electron antineutrino source with well defined hard spectrum on the base of nuclear reactor and 8-lithium transfer. The promising experiment for sterile neutrinos search
讨论了未来短基线实验中反中微子源的新概念。来源确保：结果表明，该装置具有以下优点：1）探测器体积约为立方米，每天计数率大于~（1 E +2 - 1 E +3），计数误差小于1%。拟议的来源是基于反应堆活性区附近7 Li的（n，γ）激活以及快速β衰变的8 Li同位素向远程中微子探测器的传输并返回闭环。建议的实验允许检测（电子反中微子，p）的相互作用，具有高精度，并针对搜索无菌中微子与无菌和活性中微子之间的平方质量差~1 eV 2。对（3+1）和（3+2）无菌中微子模型的模拟结果指出了在谱误差范围外寻找电子反中微子消失的空间区域。
Longitudinal kinematic imbalances in neutrino and antineutrino interactions for improved measurements of neutrino energy and the axial vector form factor
Implementation of the Martini-Ericson-Chanfray-Marteau RPA-based neutrino and antineutrino cross-section model in the GENIE neutrino event generator
Sorbonne Université, CNRS/IN2P3, Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE)（索邦大学）；IPSA-DRII；CERN, European Organization for Nuclear Research（欧洲核子研究中心）
