Updated constraints on sterile neutrino mixing in the OPERA experiment using a new \(\nu_e\) identification method

Updated constraints on sterile neutrino mixing in the OPERA experiment using a new \(\nu_e\) identification method

This paper describes a new \(\nu_e\) identification method specifically designed to improve the low-energy (\(< 30\,\mathrm{GeV}\)) \(\nu_e\) identification efficiency attained by enlarging the emulsion film scanning volume with the next generation emulsion readout system. A relative increase of...

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Veröffentlicht in:arXiv.org 2023-01
Hauptverfasser: Anokhina, A, Aoki, S, Ariga, A, Ariga, T, Bozza, C, Buontempo, S, Chukanov, A, Consiglio, L, De Lellis, G, De Serio, M, del Amo Sanchez, P, A Di Crescenzo, D Di Ferdinando, N Di Marco, Dmitrievsky, S, Dracos, M, 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, Jollet, C, Kamiscioglu, C, Kamiscioglu, M, Kim, S H, Kitagawa, N, Kodama, K, Komatsu, M, Kose, U, Kreslo, I, Lauria, A, Loverre, P, Matsuo, T, Matveev, V, Mauri, N, Medinaceli, E, Meregaglia, A, Mikado, S, Mizutani, F, Monacelli, P, Montesi, M C, Muciaccia, M T, Naganawa, N, Nakamura, M, Nakano, T, Niwa, K, Ogawa, S, Okateva, N, Ozaki, K, Paoloni, A, Paparella, L, 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, Shchedrina, T, Shibayama, E, Shibuya, H, Simone, S, Stanco, L, Stellacci, S M, Stipcevic, M, 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
Format: Artikel
Sprache:eng
Schlagworte:
Identification methods
Neutrinos
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Zusammenfassung:This paper describes a new \(\nu_e\) identification method specifically designed to improve the low-energy (\(< 30\,\mathrm{GeV}\)) \(\nu_e\) 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 MiniBooNE allowed region \(\Delta m^2_{41} \sim 0.3\,\mathrm{eV}^2\).
ISSN:2331-8422