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New results on $��_��\to ��_��$ appearance with the OPERA experiment in the CNGS beam

Authors :
OPERA Collaboration
Agafonova, N.
Aleksandrov, A.
Anokhina, A.
Aoki, S.
Ariga, A.
Ariga, T.
Asada, T.
Autiero, D.
Badertscher, A.
Dhahbi, A. Ben
Bender, D.
Bertolin, A.
Bozza, C.
Brugnera, R.
Brunetti, G.
Buettner, B.
Buontempo, S.
Chaussard, L.
Chernyavskiy, M.
Chiarella, V.
Chukanov, A.
Consiglio, L.
D'Ambrosio, N.
Sanchez, P. Del Amo
De Lellis, G.
De Serio, M.
Di Crescenzo, A.
Di Ferdinando, D.
Di Marco, N.
Dmitrievski, S.
Dracos, M.
Duchesneau, D.
Dusini, S.
Ebert, J.
Ereditato, A.
Favier, J.
Ferber, T.
Fini, R. A.
Fukuda, T.
Garfagnini, A.
Giacomelli, G.
Goellnitz, C.
Goldberg, J.
Gornushkin, Y.
Grella, G.
Grianti, F.
Guler, A. M.
Gustavino, C.
Hagner, C.
Hakamata, K.
Hara, T.
Hayakawa, T.
Hierholzer, M.
Hollnagel, A.
Hosseini, B.
Ishida, H.
Ishiguro, K.
Ishikawa, M.
Jakovcic, K.
Jollet, C.
Kamiscioglu, C.
Kamiscioglu, M.
Katsuragawa, T.
Kawahara, H.
Kawada, J.
Kim, J. H.
Kim, S. H.
Kimura, M.
Kitagawa, N.
Klicek, B.
Kodama, K.
Komatsu, M.
Kose, U.
Kreslo, I.
Lauria, A.
Lenkeit, J.
Ljubicic, A.
Longhin, A.
Loverre, P.
Malgin, A.
Mandrioli, G.
Marteau, J.
Matsuo, T.
Matveev, V.
Mauri, N.
Medinaceli, E.
Meregaglia, A.
Migliozzi, P.
Mikado, S.
Minotti, A.
Miyanishi, M.
Miyashita, E.
Monacelli, P.
Montesi, M. C.
Morishima, K.
Muciaccia, M. T.
Naganawa, N.
Naka, T.
Nakamura, M.
Nakano, T.
Nakatsuka, Y.
Niwa, K.
Ogawa, S.
Okateva, N.
Olshevsky, A.
Omura, T.
Ozaki, K.
Paoloni, A.
Park, B. D.
Park, I. G.
Pastore, A.
Patrizii, L.
Pennacchio, E.
Pessard, H.
Pistillo, C.
Podgrudkov, D.
Polukhina, N.
Pozzato, M.
Pretzl, K.
Pupilli, F.
Rescigno, R.
Roda, M.
Roganova, T.
Rokujo, H.
Rosa, G.
Rostovtseva, I.
Rubbia, A.
Russo, A.
Ryazhskaya, O.
Sato, O.
Sato, Y.
Schembri, A.
Schmidt-Parzefall, W.
Shakiryanova, I.
Schcedrina, T.
Sheshukov, A.
Shibuya, H.
Shiraishi, T.
Shoziyoev, G.
Simone, S.
Sioli, M.
Sirignano, C.
Sirri, G.
Spinetti, M.
Stanco, L.
Starkov, N.
Stellacci, S. M.
Stipcevic, M.
Strauss, T.
Strolin, P.
Suzuki, K.
Takahashi, S.
Tenti, M.
Terranova, F.
Tioukov, V.
Tolun, P.
Tufanli, S.
Vilain, P.
Vladimirov, M.
Votano, L.
Vuilleumier, J. L.
Wilquet, G.
Wonsak, B.
Yoon, C. S.
Yoshida, J.
Yoshimoto, M.
Zaitsev, Y.
Zemskova, S.
Zghiche, A.
Publication Year :
2013
Publisher :
arXiv, 2013.

Abstract

The OPERA neutrino experiment is designed to perform the first observation of neutrino oscillations in direct appearance mode in the $��_��\to ��_��$ channel, via the detection of the $��$-leptons created in charged current $��_��$ interactions. The detector, located in the underground Gran Sasso Laboratory, consists of an emulsion/lead target with an average mass of about 1.2 kt, complemented by electronic detectors. It is exposed to the CERN Neutrinos to Gran Sasso beam, with a baseline of 730 km and a mean energy of 17 GeV. The observation of the first $��_��$ candidate event and the analysis of the 2008-2009 neutrino sample have been reported in previous publications. This work describes substantial improvements in the analysis and in the evaluation of the detection efficiencies and backgrounds using new simulation tools. The analysis is extended to a sub-sample of 2010 and 2011 data, resulting from an electronic detector-based pre-selection, in which an additional $��_��$ candidate has been observed. The significance of the two events in terms of a $��_��\to ��_��$ oscillation signal is of 2.40 $��$.<br />33 pages, 12 figures, 5 tables. Prepared for submission to JHEP

Subjects

Subjects :
High Energy Physics - Experiment (hep-ex)
Physics::Instrumentation and Detectors
FOS: Physical sciences
High Energy Physics::Experiment
Instrumentation and Detectors (physics.ins-det)
Nuclear Experiment

Details

Database :
OpenAIRE
Accession number :
edsair.doi...........c582f3302d55ebc1a9c5313d842461f1
Full Text :
https://doi.org/10.48550/arxiv.1308.2553
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