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arXiv · 2211.04636

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

N. Agafonova·A. Alexandrov·A. Anokhina·S. Aoki·A. Ariga·T. Ariga·A. Bertolin·C. Bozza·R. Brugnera·S. Buontempo·M. Chernyavskiy·A. Chukanov·L. Consiglio·N. D'Ambrosio·G. De Lellis·M. De Serio·P. del Amo Sanchez·A. Di Crescenzo·D. Di Ferdinando·N. Di Marco·S. Dmitrievsky·M. Dracos·D. Duchesneau·S. Dusini·T. Dzhatdoev·J. Ebert·A. Ereditato·R. A. Fini·T. Fukuda·G. Galati·A. Garfagnini·V. Gentile·J. Goldberg·S. Gorbunov·Y. Gornushkin·G. Grella·A. M. Guler·C. Gustavino·C. Hagner·T. Hara·T. Hayakawa·A. Hollnagel·K. Ishiguro·A. Iuliano·K. Jakovcic·C. Jollet·C. Kamiscioglu·M. Kamiscioglu·S. H. Kim·N. Kitagawa·B. Klicek·K. Kodama·M. Komatsu·U. Kose·I. Kreslo·F. Laudisio·A. Lauria·A. Longhin·P. Loverre·A. Malgin·G. Mandrioli·T. Matsuo·V. Matveev·N. Mauri·E. Medinaceli·A. Meregaglia·S. Mikado·M. Miyanishi·F. Mizutani·P. Monacelli·M. C. Montesi·K. Morishima·M. T. Muciaccia·N. Naganawa·T. Naka·M. Nakamura·T. Nakano·K. Niwa·S. Ogawa·N. Okateva·K. Ozaki·A. Paoloni·L. Paparella·B. D. Park·L. Pasqualini·A. Pastore·L. Patrizii·H. Pessard·D. Podgrudkov·N. Polukhina·M. Pozzato·F. Pupilli·M. Roda·T. Roganova·H. Rokujo·G. Rosa·O. Ryazhskaya·O. Sato·A. Schembri·I. Shakiryanova
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Abstract

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 $\Delta m^2_{41} \sim 0.3\,\mathrm{eV}^2$.

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N. Agafonova, A. Alexandrov, A. Anokhina, S. Aoki, A. Ariga, T. Ariga, A. Bertolin, C. Bozza, R. Brugnera, S. Buontempo, M. Chernyavskiy, A. Chukanov, L. Consiglio, N. D'Ambrosio, G. De Lellis, M. De Serio, P. del Amo Sanchez, A. Di Crescenzo, D. Di Ferdinando, N. Di Marco, S. Dmitrievsky, M. Dracos, D. Duchesneau, S. Dusini, T. Dzhatdoev, J. Ebert, A. Ereditato, R. A. Fini, T. Fukuda, G. Galati, A. Garfagnini, V. Gentile, J. Goldberg, S. Gorbunov, Y. Gornushkin, G. Grella, A. M. Guler, C. Gustavino, C. Hagner, T. Hara, T. Hayakawa, A. Hollnagel, K. Ishiguro, A. Iuliano, K. Jakovcic, C. Jollet, C. Kamiscioglu, M. Kamiscioglu, S. H. Kim, N. Kitagawa, B. Klicek, K. Kodama, M. Komatsu, U. Kose, I. Kreslo, F. Laudisio, A. Lauria, A. Longhin, P. Loverre, A. Malgin, G. Mandrioli, T. Matsuo, V. Matveev, N. Mauri, E. Medinaceli, A. Meregaglia, S. Mikado, M. Miyanishi, F. Mizutani, P. Monacelli, M. C. Montesi, K. Morishima, M. T. Muciaccia, N. Naganawa, T. Naka, M. Nakamura, T. Nakano, K. Niwa, S. Ogawa, N. Okateva, K. Ozaki, A. Paoloni, L. Paparella, B. D. Park, L. Pasqualini, A. Pastore, L. Patrizii, H. Pessard, D. Podgrudkov, N. Polukhina, M. Pozzato, F. Pupilli, M. Roda, T. Roganova, H. Rokujo, G. Rosa, O. Ryazhskaya, O. Sato, A. Schembri, I. Shakiryanova. 2022-11-09. Updated constraints on sterile neutrino mixing in the OPERA experiment using a new $\nu_e$ identification method. https://arxiv.org/abs/2211.04636

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