Updated constraints on sterile neutrino mixing in the OPERA experiment using a new ν e identification method

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.; Di Marco, N.; Dmitrievsky, S.; Dracos, M.; Duchesneau, D.; Dusini, S.; Dzhatdoev, T.; Ebert, J.; Ereditato, A.; Fini, R.A.; Fukuda, T.; Galati, G.; Garfagnini, A.; Gentile, V.; Goldberg, J.; Gorbunov, S.; Gornushkin, Y.; Grella, G.; Guler, ALİ; Gustavino, C.; Hagner, C.; Hara, T.; Hayakawa, T.; Hollnagel, A.; Ishiguro, K.; Iuliano, A.; Jakovčć, K.; Jollet, C.; Kamiscioglu, C.; Kamiscioglu, MUSTAFA; Kim, S.H.; Kitagawa, N.; Kliček, B.; Kodama, K.; Komatsu, M.; Kose, U.; Kreslo, I.; Laudisio, F.; Lauria, A.; Longhin, A.; Loverre, P.; Malgin, A.; Mandrioli, G.; Matsuo, T.; Matveev, V.; Mauri, N.; Medinaceli, E.; Meregaglia, A.; Mikado, S.; Miyanishi, M.; Mizutani, F.; Monacelli, P.; Montesi, M.C.; Morishima, K.; Muciaccia, M.T.; Naganawa, N.; Naka, T.; Nakamura, M.; Nakano, T.; Niwa, K.; Ogawa, S.; Okateva, N.; Ozaki, K.; Paoloni, A.; Paparella, L.; Park, B.D.; Pasqualini, L.; Pastore, A.; Patrizii, L.; Pessard, H.; Podgrudkov, D.; Polukhina, N.; Pozzato, M.; Pupilli, F.; Roda, M.; Roganova, T.; Rokujo, H.; Rosa, G.; Ryazhskaya, O.; Sato, O.; Schembri, A.; Shakiryanova, I.; Shchedrina, T.; Shibayama, E.; Shibuya, H.; Shiraishi, T.; Simone, S.; Sirignano, C.; Sirri, G.; Sotnikov, A.; Spinetti, M.; Stanco, L.; Starkov, N.; Stellacci, S.M.; Stipčevic, M.; Strolin, P.; Takahashi, S.; Tenti, M.; Terranova, F.; Tioukov, V.; Tufanli, S.; Vasina, S.; Vilain, P.; Voevodina, E.; Votano, L.; Vuilleumier, J.L.; Wilquet, G.; Yoon, C.S.

doi:10.1093/ptep/ptad012

Updated constraints on sterile neutrino mixing in the OPERA experiment using a new ν e identification method

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Agafonova N., Alexandrov A., Anokhina A., Aoki S., Ariga A., Ariga T., ...More

Progress of Theoretical and Experimental Physics, vol.2023, no.3, 2023 (SCI-Expanded)

Publication Type: Article / Article
Volume: 2023 Issue: 3
Publication Date: 2023
Doi Number: 10.1093/ptep/ptad012
Journal Name: Progress of Theoretical and Experimental Physics
Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Applied Science & Technology Source, INSPEC, zbMATH, Directory of Open Access Journals
Middle East Technical University Affiliated: Yes

Abstract

This paper describes a new νe identification method specifically designed to improve the low-energy (< 30 GeV) νe 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 νe 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 νe candidate is found. The analysis combined with the ντ appearance results improves the upper limit on sin 22θμe to 0.016 at 90% C.L. in the MiniBooNE allowed region Δm241 ∼ 0.3 eV2