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- Title
Updated constraints on sterile neutrino mixing in the OPERA experiment using a new νe identification method.
- Authors
OPERA Collaboration; Agafonova, N; Alexandrov, A; Anokhina, A; Aoki, S; Ariga, A; Ariga, T; Bertolin, A; Bozza, C; Brugnera, R; Buontempo, S; Chernyavskiy, M; Chukanov, A; Consiglio, L; D'Ambrosio, N; De Lellis, G; De Serio, M; del Amo Sanchez, P; Di Crescenzo, A; Di Ferdinando, D
- Abstract
This paper describes a new ν e identification method specifically designed to improve the low-energy (|$\lt {30}\, {\rm GeV}$|) ν e identification efficiency attained by enlarging the emulsion film scanning volume with the next-generation emulsion readout system. A relative increase of 25–70% in the ν e low-energy region is expected, leading to improvements in the OPERA sensitivity to neutrino oscillations in the framework of the 3 + 1 model. The method is applied to a subset of data where the detection efficiency increase is expected to be more relevant, and one additional ν e candidate is found. The analysis combined with the ντ appearance results improves the upper limit on sin 22θμ e to 0.016 at 90% C.L. in the MiniBooNE allowed region |$\Delta m^2_{41} \sim {0.3}\, {\rm eV}^{2}$|.
- Subjects
STERILE neutrinos; NEUTRINO oscillation; NEUTRINOS; OPERA; EMULSIONS; MOLECULAR recognition
- Publication
Progress of Theoretical & Experimental Physics: PTEP, 2023, Vol 2023, Issue 3, p1
- ISSN
2050-3911
- Publication type
Article
- DOI
10.1093/ptep/ptad012