Updated constraints on sterile neutrino mixing in the OPERA experiment using a new nu(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, A.M.; Gustavino, C.; Hagner, C.; Hara, T.; Hayakawa, T.; Hollnagel, A.; Ishiguro, K.; Iuliano, A.; Jakovčć, K.; Jollet, C.; Kamiscioglu, ÇAĞIN; Kamiscioglu, M.; 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 nu(e) identification method

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, Scopus)

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
Open Archive Collection: AVESIS Open Access Collection
Ankara University Affiliated: Yes

Abstract

This paper describes a new v(e) identification method specifically designed to improve the low-energy (< 30 GeV) nu(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 nu(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 nu(e) candidate is found. The analysis combined with the nu(tau) appearance results improves the upper limit on sin (2)2 theta(mu e) to 0.016 at 90% C.L. in the Mini-BooNE allowed region Delta m(41)(2) similar to 0.3 eV(2).