Measurements of the charge ratio and polarization of cosmic-ray muons
with the Super-Kamiokande detector
H. Kitagawa,T. Tada,K. Abe,C. Bronner,Y. Hayato,K. Hiraide,K. Hosokawa,K. Ieki,M. Ikeda,J. Kameda,Y. Kanemura,R. Kaneshima,Y. Kashiwagi,Y. Kataoka,S. Miki,S. Mine,M. Miura,S. Moriyama,Y. Nakano,M. Nakahata,S. Nakayama,Y. Noguchi,K. Okamoto,K. Sato,H. Sekiya,H. Shiba,K. Shimizu,M. Shiozawa,Y. Sonoda,Y. Suzuki,A. Takeda,Y. Takemoto,A. Takenaka,H. Tanaka,S. Watanabe,T. Yano,S. Han,T. Kajita,K. Okumura,T. Tashiro,T. Tomiya,X. Wang,S. Yoshida,G. D. Megias,P. Fernandez,L. Labarga,N. Ospina,B. Zaldivar,B. W. Pointon,E. Kearns,J. L. Raaf,L. Wan,T. Wester,J. Bian,N. J. Griskevich,S. Locke,M. B. Smy,H. W. Sobel,V. Takhistov,A. Yankelevich,J. Hill,M. C. Jang,S. H. Lee,D. H. Moon,R. G. Park,B. Bodur,K. Scholberg,C. W. Walter,A. Beauchêne,O. Drapier,A. Giampaolo,Th. A. Mueller,A. D. Santos,P. Paganini,B. Quilain,R. Rogly,T. Nakamura,J. S. Jang,L. N. Machado,J. G. Learned,K. Choi,N. Iovine,S. Cao,L. H. V. Anthony,D. Martin,N. W. Prouse,M. Scott,A. A. Sztuc,Y. Uchida,V. Berardi,N. F. Calabria,M. G. Catanesi,E. Radicioni,A. Langella,G. De Rosa,G. Collazuol,F. Iacob,M. Lamoureux,M. Mattiazzi,L. Ludovici,M. Gonin,L. Périssé,G. Pronost,C. Fujisawa,Y. Maekawa,Y. Nishimura,R. Okazaki,R. Akutsu,M. Friend,T. Hasegawa,T. Ishida,T. Kobayashi,M. Jakkapu,T. Matsubara,T. Nakadaira,K. Nakamura,Y. Oyama,K. Sakashita,T. Sekiguchi,T. Tsukamoto,N. Bhuiyan,G. T. Burton,F. Di Lodovico,J. Gao,A. Goldsack,T. Katori,J. Migenda,R. M. Ramsden,Z. Xie,S. Zsoldos,Y. Kotsar,H. Ozaki,A. T. Suzuki,Y. Takagi,Y. Takeuchi,H. Zhong,J. Feng,L. Feng,J. R. Hu,Z. Hu,M. Kawaue,T. Kikawa,M. Mori,T. Nakaya,R. A. Wendell,K. Yasutome,S. J. Jenkins,N. McCauley,P. Mehta,A. Tarant,M. J. Wilking,Y. Fukuda,Y. Itow,H. Menjo,K. Ninomiya,Y. Yoshioka,J. Lagoda,M. Mandal,P. Mijakowski,Y. S. Prabhu,J. Zalipska,M. Jia,J. Jiang,C. K. Jung,W. Shi,C. Yanagisawa,M. Harada,Y. Hino,H. Ishino,Y. Koshio,F. Nakanishi,S. Sakai,T. Tano,T. Ishizuka,G. Barr,D. Barrow,L. Cook,S. Samani,D. Wark,A. Holin,F. Nova,S. Jung,B. S. Yang,J. Y. Yang,J. Yoo,J. E. P. Fannon,L. Kneale,M. Malek,J. M. McElwee,M. D. Thiesse,L. F. Thompson,S. T. Wilson,H. Okazawa,S. M. Lakshmi,S. B. Kim,E. Kwon,J. W. Seo,I. Yu,A. K. Ichikawa,K. D. Nakamura,S. Tairafune,K. Nishijima,A. Eguchi,K. Nakagiri,Y. Nakajima,S. Shima,N. Taniuchi,E. Watanabe,M. Yokoyama,P. de Perio,S. Fujita,C. Jesús-Valls,K. Martens,K. M. Tsui,M. R. Vagins,J. Xia,S. Izumiyama,M. Kuze,R. Matsumoto,K. Terada,M. Ishitsuka,H. Ito,T. Kinoshita,Y. Ommura,N. Shigeta,M. Shinoki,T. Suganuma,K. Yamauchi,T. Yoshida,J. F. Martin,H. A. Tanaka,T. Towstego,R. Gaur,V. Gousy-Leblanc,M. Hartz,A. Konaka,X. Li,S. Chen,B. D. Xu,B. Zhang,M. Posiadala-Zezula,S. B. Boyd,R. Edwards,D. Hadley,M. Nicholson,M. O'Flaherty,B. Richards,A. Ali,B. Jamieson,S. Amanai,Ll. Marti,A. Minamino,G. Pintaudi,S. Sano,S. Suzuki,K. Wada
arxiv（2024）
引用0|浏览3
暂无评分
摘要
We present the results of the charge ratio (R) and polarization
(P^μ_0) measurements using the decay electron events collected from
2008 September to 2022 June by the Super-Kamiokande detector. Because of its
underground location and long operation, we performed high precision
measurements by accumulating cosmic-ray muons. We measured the muon charge
ratio to be R=1.32 ± 0.02 (stat.+syst.) at
E_μcosθ_Zenith=0.7^+0.3_-0.2 TeV, where
E_μ is the muon energy and θ_Zenith is the zenith angle
of incoming cosmic-ray muons. This result is consistent with the Honda flux
model while this suggests a tension with the π K model of 1.9σ. We
also measured the muon polarization at the production location to be
P^μ_0=0.52 ± 0.02 (stat.+syst.) at the muon
momentum of 0.9^+0.6_-0.1 TeV/c at the surface of the
mountain; this also suggests a tension with the Honda flux model of
1.5σ. This is the most precise measurement ever to experimentally
determine the cosmic-ray muon polarization near 1 TeV/c. These
measurement results are useful to improve the atmospheric neutrino simulations.
