New results on $\nu_\mu \to \nu_\tau$ appearance with the OPERA experiment in the CNGS beam

New results on $\nu_\mu \to \nu_\tau$ appearance with the OPERA experiment in the CNGS beam

The OPERA neutrino experiment is designed to perform the first observation of neutrino oscillations in direct appearance mode in the $\nu_\mu \to \nu_\tau$ channel, via the detection of the $\tau$-leptons created in charged current $\nu_\tau$ interactions. The detector, located in the underground Gr...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: OPERA Collaboration, Agafonova, N, Aleksandrov, A, Aoki, S, Asada, T, Dhahbi, A. Ben, Bender, D, Brugnera, R, Buettner, B, Buontempo, S, Chaussard, L, Chiarella, V, Consiglio, L, D'Ambrosio, N, Sanchez, P. Del Amo, De Serio, M, Di Ferdinando, D, Dracos, M, Duchesneau, D, Ferber, T, Fukuda, T, Garfagnini, A, Giacomelli, G, Goellnitz, C, Grianti, F, Gustavino, C, Hayakawa, T, Hollnagel, A, Ishida, H, Ishiguro, K, Ishikawa, M, Jakovcic, K, Kamiscioglu, M, Katsuragawa, T, 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, Loverre, P, Malgin, A, Mandrioli, G, Matsuo, T, Matveev, V, Medinaceli, E, Meregaglia, A, Migliozzi, P, Miyanishi, M, Miyashita, E, Monacelli, P, Morishima, K, Muciaccia, M. T, Naganawa, N, Naka, T, Nakamura, M, Nakatsuka, Y, Omura, T, Paoloni, A, Pastore, A, Patrizii, L, Pennacchio, E, Pessard, H, Polukhina, N, Pozzato, M, Pretzl, K, Rescigno, R, Rokujo, H, Rosa, G, Rostovtseva, I, Russo, A, Ryazhskaya, O, Sato, O, Sato, Y, Schmidt-Parzefall, W, Shakiryanova, I, Sheshukov, A, Shibuya, H, Shiraishi, T, Shoziyoev, G, Sioli, M, Spinetti, M, Stanco, L, Starkov, N, Stipcevic, M, Strolin, P, Tenti, M, Terranova, F, Tioukov, V, Tufanli, S, Vilain, P, Votano, L, Vuilleumier, J. L, Zghiche, A
Format: Artikel
Sprache:eng
Schlagworte:
Physics - High Energy Physics - Experiment
Physics - Instrumentation and Detectors
Online-Zugang:Volltext bestellen
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:The OPERA neutrino experiment is designed to perform the first observation of neutrino oscillations in direct appearance mode in the $\nu_\mu \to \nu_\tau$ channel, via the detection of the $\tau$-leptons created in charged current $\nu_\tau$ 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 $\nu_\tau$ 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 $\nu_\tau$ candidate has been observed. The significance of the two events in terms of a $\nu_\mu \to \nu_\tau$ oscillation signal is of 2.40 $\sigma$.
DOI:10.48550/arxiv.1308.2553