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

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 t...

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Detalles Bibliográficos
Autores principales: 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., Jakovčić, K., Jollet, C., Kamiscioglu, C., 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., Rodak, 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., Stipčević, 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.
Lenguaje:eng
Publicado: 2022
Materias:
hep-ex
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1093/ptep/ptad012
http://cds.cern.ch/record/2847477
Descripción
Sumario: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 ν_τ appearance results improves the upper limit on sin ^22θμe to 0.016 at 90% C.L. in the MiniBooNE allowed region |$\Delta m^2_{41} \sim {0.3}\, {\rm eV}^{2}$|⁠.

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