First measurement of the strange axial coupling constant using neutral-current quasielastic interactions of atmospheric neutrinos at KamLAND
Year: 2023
Type: article
Abstract: We report a measurement of the strange axial coupling constant ${g}_{A}^{s}$ using atmospheric neutrino data at KamLAND. This constant is a component of the axial form factor of the neutral-current quasielastic (NCQE) interaction. The value of ${g}_{A}^{s}$ significantly changes the ratio of proton and neutron NCQE cross sections. KamLAND is suitable for measuring NCQE interactions as it can detect nucleon recoils with low-energy thresholds and measure neutron multiplicity with high efficiency. KamLAND data, including the information on neutron multiplicity associated with the NCQE interactions, makes it possible to measure ${g}_{A}^{s}$ with a suppressed dependence on the axial mass ${M}_{A}$, which has not yet been determined. For a comprehensive prediction of the neutron emission associated with neutrino interactions, we establish a simulation of particle emission via nuclear deexcitation of $^{12}\mathrm{C}$, a process not considered in existing neutrino Monte Carlo event generators. Energy spectrum fitting for each neutron multiplicity gives ${g}_{A}^{s}=\ensuremath{-}0.1{4}_{\ensuremath{-}0.26}^{+0.25}$, which is the most stringent limit obtained using NCQE interactions without ${M}_{A}$ constraints. The two-body current contribution considered in this analysis relies on a theoretically effective model and electron scattering experiments and requires future verification by direct measurements and future model improvement.
Authors: S. Abe, S. Asami, M. Eizuka, S. Futagi, A. Gando, Y. Gando, T. Gima, A. Goto, T. Hachiya, K. Hata, K. Ichimura, S. Ieki, H. Ikeda, K. Inoue, K. Ishidoshiro, Y. Kamei, N. Kawada, Y. Kishimoto, M. Koga, M. Kurasawa, T. Mitsui, H. Miyake, T. Nakahata, K. Nakamura, R. Nakamura, H. Ozaki, T. Sakai, I. Shimizu, J. Shirai, K. Shiraishi, A. Suzuki, Y. Suzuki, A. Takeuchi, K. Tamae, H. Watanabe, Y. Yoshida, S. Obara, A. K. Ichikawa, S. Yoshida, S. Umehara, K. Fushimi, K. Kotera, Y. Urano, B. E. Berger, B. K. Fujikawa, J. G. Learned, J. Maricic, S. N. Axani, Z. Fu, J. Smolsky, L. A. Winslow, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, J. A. Detwiler, S. Enomoto, M. P. Decowski, C. Grant, A. Li, H. Song, S. Dell’Oro, T. O’Donnell
Institutions: Tohoku University, Research Center for Neutrino Science, Tohoku University, Obihiro University of Agriculture and Veterinary Medicine, Kavli Institute for the Physics and Mathematics of the Universe, The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, The University of Osaka, Research Center for Nuclear Physics, The University of Osaka, Tokushima University, Lawrence Berkeley National Laboratory, University of Hawaiʻi at Mānoa, University of Delaware, Massachusetts Institute of Technology, University of Tennessee at Knoxville, University of North Carolina at Chapel Hill, North Carolina Central University, Duke University, Triangle Universities Nuclear Laboratory, University of Washington, National Institute for Subatomic Physics, University of Amsterdam, Boston University, Virginia Tech
Language: English
Topic: Neutrino Physics Research
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Awards: G1012459053, G1286236842, G1863003419, 大強度加速器と大型液体シンチレータ検出器で紐解くニュートリノ原子核反応, G3083819904, G365575497, G42916606, ニュートリノ原子核反応の高精度化から迫る宇宙物質優勢の謎, G6048933907, G638836682, Search for Majorana neutrino mass with the world's best sensitivity, Dark matter serach with high purity detector, G969889393
OpenAlex ID: W4366580985