Limits on sterile neutrino mixing using atmospheric neutrinos in Super-Kamiokande

作者：Abe, K.^*; Haga, Y.; Hayato, Y.; Ikeda, M.; Iyogi, K.; Kameda, J.; Kishimoto, Y.; Miura, M.; Moriyama, S.; Nakahata, M.; Nakano, Y.; Nakayama, S.; Sekiya, H.; Shiozawa, M.; Suzuki, Y.; Takeda, A.; Tanaka, H.; Tomura, T.; Ueno, K.; Wendell, R. A.; Yokozawa, T.; Irvine, T.; Kajita, T.; Kametani, I.; Kaneyuki, K.; Lee, K. P.; McLachlan, T.; Nishimura, Y.; Richard, E.; Okumura, K.; Labarga, L.; Fernandez, P.; Gustafson, J.; Kearns, E.; Raaf, J. L.; Stone, J. L.; Sulak, L. R.; Berkman, S.

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2015, 91(5): 052019.

DOI：10.1103/PhysRevD.91.052019

• RANGE

We present limits on sterile neutrino mixing using 4,438 live-days of atmospheric neutrino data from the Super-Kamiokande experiment. We search for fast oscillations driven by an eV(2)-scale mass splitting and for oscillations into sterile neutrinos instead of tau neutrinos at the atmospheric mass splitting. When performing both of these searches we assume that the sterile mass splitting is large, allowing sin(2) (Delta m(2)L/4E) to be approximated as 0.5, and we assume that there is no mixing between electron neutrinos and sterile neutrinos (vertical bar U-e4 vertical bar(2) = 0). No evidence of sterile oscillations is seen and we limit vertical bar U-mu 4 vertical bar(2) to less than 0.041 and vertical bar U-tau 4 vertical bar(2) to less than 0.18 for Delta m(2) > 0.1 eV(2) at the 90% C.L. in a 3 + 1 framework. The approximations that can be made with atmospheric neutrinos allow these limits to be easily applied to 3 + N models, and we provide our results in a generic format to allow comparisons with other sterile neutrino models.

• 出版日期2015-3-24
• 单位清华大学