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Abstract

The OPERA experiment has discovered the tau neutrino appearance in the CNGS muon neutrino beam, in agreement with the 3 neutrino flavour oscillation hypothesis. The OPERA neutrino interaction target, made of Emulsion Cloud Chambers, was particularly efficient in the reconstruction of electromagnetic showers. Moreover, thanks to the very high granularity of the emulsion films, showers induced by electrons can be distinguished from those induced by π0s, thus allowing the detection of charged current interactions of electron neutrinos. In this paper the results of the search for electron neutrino events using the full dataset are reported. An improved method for the electron neutrino energy estimation is exploited. Data are compatible with the 3 neutrino flavour mixing model expectations and are used to set limits on the oscillation parameters of the 3+1 neutrino mixing model, in which an additional mass eigenstate m4 is introduced. At high Δm412 (≳0.1 eV2), an upper limit on sin2 2θμe is set to 0.021 at 90% C.L. and Δm412 ≳ 4 × 10− 3 eV2 is excluded for maximal mixing in appearance mode.

Details

Title
Final results of the search for ν μ → ν e oscillations with the OPERA detector in the CNGS beam
Author
Agafonova, N 1 ; Aleksandrov, A 2 ; Anokhina, A 3 ; Aoki, S 4 ; Ariga, A 5 ; Ariga, T 6 ; Bertolin, A 7 ; Bozza, C 8 ; Brugnera, R 9 ; Buonaura, A 10 ; Buontempo, S 2 ; Chernyavskiy, M 11 ; Chukanov, A 12 ; Consiglio, L 2 ; N D’Ambrosio 13 ; De Lellis, G 10 ; De Serio, M 14 ; del Amo Sanchez, P 15 ; A Di Crescenzo 10 ; D Di Ferdinando 16 ; N Di Marco 13 ; Dmitrievsky, S 12 ; Dracos, M 17 ; Duchesneau, D 15 ; Dusini, S 7 ; Dzhatdoev, T 3 ; Ebert, J 18 ; Ereditato, A 5 ; Favier, J 15 ; Fini, R A 19 ; Fornari, F 20 ; Fukuda, T 21 ; Galati, G 10 ; Garfagnini, A 9 ; Gentile, V 22 ; Goldberg, J 23 ; Gornushkin, Y 12 ; Gorbunov, S 11 ; Grella, G 8 ; Guler, A M 24 ; Gustavino, C 25 ; Hagner, C 18 ; Hara, T 4 ; Hayakawa, T 21 ; Hollnagel, A 18 ; Hosseini, B 26 ; Ishiguro, K 21 ; Iuliano, A 27 ; Jakovcic, K 28 ; Jollet, C 17 ; Kamiscioglu, C 29 ; Kamiscioglu, M 24 ; Kim, S H 30 ; Kitagawa, N 21 ; Klicek, B 31 ; Kodama, K 32 ; Komatsu, M 21 ; Kose, U 33 ; Kreslo, I 5 ; Laudisio, F 9 ; Lauria, A 10 ; Ljubicic, A 28 ; Longhin, A 9 ; Loverre, P 25 ; Malgin, A 1 ; Malenica, M 28 ; Mandrioli, G 16 ; Matsuo, T 34 ; Matveev, V 1 ; Mauri, N 20 ; Medinaceli, E 35 ; Meisel, F 5 ; Meregaglia, A 17 ; Mikado, S 36 ; Miyanishi, M 21 ; Mizutani, F 4 ; Monacelli, P 25 ; Montesi, M C 10 ; Morishima, K 21 ; Muciaccia, M T 14 ; Naganawa, N 21 ; Naka, T 21 ; Nakamura, M 21 ; Nakano, T 21 ; Niwa, K 21 ; Okateva, N 11 ; Ogawa, S 34 ; Ozaki, K 4 ; Paoloni, A 37 ; Paparella, L 14 ; Park, B D 30 ; Pasqualini, L 20 ; Pastore, A 19 ; Patrizii, L 16 ; Pessard, H 15 ; Podgrudkov, D 3 ; Polukhina, N 38 ; Pozzato, M 20 ; Pupilli, F 7 ; Roda, M 39 ; Roganova, T 3 ; Rokujo, H 21 ; Rosa, G 25 ; Ryazhskaya, O 1 ; Sato, O 21 ; Schembri, A 13 ; Shakiryanova, I 1 ; Shchedrina, T 11 ; Shibuya, H 34 ; Shibayama, E 34 ; Shiraishi, T 21 ; Simone, S 14 ; Sirignano, C 9 ; Sirri, G 16 ; Sotnikov, A 12 ; Spinetti, M 37 ; Stanco, L 7 ; Starkov, N 11 ; Stellacci, S M 8 ; Stipcevic, M 31 ; Strolin, P 10 ; Takahashi, S 4 ; Tenti, M 16 ; Terranova, F 40 ; Tioukov, V 2 ; Vasina, S 12 ; Vilain, P 41 ; Voevodina, E 2 ; Votano, L 37 ; Vuilleumier, J L 5 ; Wilquet, G 41 ; Yoon, C S 30 

1  INR — Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia 
2  INFN — Sezione di Napoli, Napoli, Italy 
3  SINP MSU — Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia 
4  Kobe University, Kobe, Japan 
5  Albert Einstein Center for Fundamental Physics, Laboratory for High Energy Physics (LHEP), University of Bern, Bern, Switzerland 
6  Albert Einstein Center for Fundamental Physics, Laboratory for High Energy Physics (LHEP), University of Bern, Bern, Switzerland; Faculty of Arts and Science, Kyushu University, Fukuoka, Japan 
7  INFN — Sezione di Padova, Padova, Italy 
8  Dipartimento di Fisica dell’Università di Salerno and “Gruppo Collegato” INFN, Fisciano (Salerno), Italy 
9  INFN — Sezione di Padova, Padova, Italy; Dipartimento di Fisica e Astronomia dell’Università di Padova, Padova, Italy 
10  INFN — Sezione di Napoli, Napoli, Italy; Dipartimento di Fisica dell’Università Federico II di Napoli, Napoli, Italy 
11  LPI — Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, Russia 
12  JINR — Joint Institute for Nuclear Research, Dubna, Russia 
13  INFN — Laboratori Nazionali del Gran Sasso, Assergi, L’Aquila, Italy 
14  Dipartimento di Fisica dell’Università di Bari, Bari, Italy; INFN — Sezione di Bari, Bari, Italy 
15  LAPP, Université Savoie Mont Blanc, CNRS/IN2P3, Annecy-le-Vieux, France 
16  INFN — Sezione di Bologna, Bologna, Italy 
17  IPHC, Université de Strasbourg, CNRS/IN2P3, Strasbourg, France 
18  Hamburg University, Hamburg, Germany 
19  INFN — Sezione di Bari, Bari, Italy 
20  INFN — Sezione di Bologna, Bologna, Italy; Dipartimento di Fisica e Astronomia dell’Università di Bologna, Bologna, Italy 
21  Nagoya University, Nagoya, Japan 
22  GSSI — Gran Sasso Science Institute, L’Aquila, Italy 
23  Department of Physics, Technion, Haifa, Israel 
24  METU — Middle East Technical University, Ankara, Turkey 
25  INFN — Sezione di Roma, Roma, Italy 
26  INFN — Sezione di Napoli, Napoli, Italy; Dipartimento di Fisica dell’Università Federico II di Napoli, Napoli, Italy; INFN Sezione di Cagliari, Monserrato, Italy 
27  Dipartimento di Fisica dell’Università Federico II di Napoli, Napoli, Italy 
28  Ruder Bošković Institute, Zagreb, Croatia 
29  METU — Middle East Technical University, Ankara, Turkey; Ankara University, Ankara, Turkey 
30  Gyeongsang National University, Jinju, Korea 
31  Center of Excellence for Advanced Materials and Sensing Devices, Ruder Bošković Institute, Zagreb, Croatia 
32  Aichi University of Education, Kariya (Aichi-Ken), Japan 
33  INFN — Sezione di Padova, Padova, Italy; CERN, Geneva, Switzerland 
34  Toho University, Funabashi, Japan 
35  INFN — Sezione di Padova, Padova, Italy; Dipartimento di Fisica e Astronomia dell’Università di Padova, Padova, Italy; Osservatorio Astronomico di Padova, Padova, Italy 
36  Nihon University, Narashino, Chiba, Japan 
37  INFN — Laboratori Nazionali di Frascati dell’INFN, Frascati (Roma), Italy 
38  LPI — Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, Russia; MEPhI — Moscow Engineering Physics Institute, Moscow, Russia 
39  INFN — Sezione di Padova, Padova, Italy; Dipartimento di Fisica e Astronomia dell’Università di Padova, Padova, Italy; University of Liverpool, Liverpool, UK 
40  Dipartimento di Fisica dell’Università di Milano-Bicocca, Milano, Italy 
41  IIHE, Université Libre de Bruxelles, Brussels, Belgium 
Pages
1-15
Publication year
2018
Publication date
Jun 2018
Publisher
Springer Nature B.V.
e-ISSN
10298479
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.1007/JHEP06(2018)151
ProQuest document ID
2062101872
Copyright
Journal of High Energy Physics is a copyright of Springer, (2018). All Rights Reserved.