Observation of nu_tau appearance in the CNGS beam with the OPERA experiment

The OPERA experiment is searching for $\nu _\mu \rightarrow \nu _\tau$ oscillations in appearance mode, i.e., via the direct detection of $\tau$ leptons in $\nu _\tau$ charged-current interactions. The evidence of $\nu _\mu \rightarrow \nu _\tau$ appearance has been previously reported with three $\...

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Detalles Bibliográficos
Autores principales: Agafonova, N., Aleksandrov, A., Anokhina, A., Aoki, S., Ariga, A., Ariga, T., Asada, T., Bender, D., Bertolin, A., Bozza, C., Brugnera, R., Buonaura, A., Buontempo, S., Buttner, B., Chernyavsky, 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., Dmitrievski, S., Dracos, M., Duchesneau, D., Dusini, S., Dzhatdoev, T., Ebert, J., Ereditato, A., Fini, R.A., Fukuda, T., Galati, G., Garfagnini, A., Giacomelli, G., Goellnitz, C., Goldberg, J., Gornushkin, Y., Grella, G., Guler, M., Gustavino, C., Hagner, C., Hara, T., Hayakawa, T., Hollnagel, A., Hosseini, B., Ishida, H., Ishiguro, K., Jakovcic, K., Jollet, C., Kamiscioglu, C., Kamiscioglu, M., Katsuragawa, T., Kawada, J., Kawahara, H., Kim, J.H., Kim, S.H., Kitagawa, N., Klicek, B., Kodama, K., Komatsu, M., Kose, U., Kreslo, I., Lauria, A., Lenkeit, J., Ljubicic, A., Longhin, A., Loverre, P., Malenica, M., Malgin, A., Mandrioli, G., Matsuo, T., Matveev, V., Mauri, N., Medinaceli, E., Meregaglia, A., Meyer, M., Mikado, S., Miyanishi, M., 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., Pasqualini, L., Pastore, A., Patrizii, L., Pessard, H., Pistillo, C., Podgrudkov, D., Polukhina, N., Pozzato, M., Pupilli, F., Roda, M., Roganova, T., Rokujo, H., Rosa, G., Ryazhskaya, O., Sato, O., Schembri, A., Shakiryanova, I., Shchedrina, 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., Strolin, P., Takahashi, S., Tenti, M., Terranova, F., Tioukov, V., Tufanli, S., Umemoto, A., Vilain, P., Vladimirov, M., Votano, L., Vuilleumier, J.L., Wilquet, G., Wonsak, B., Yoon, C.S., Yaguchi, I., Yoshimoto, M., Zemskova, S., Zghiche, A.
Lenguaje:eng
Publicado: 2014
Materias:
hep-ex
Acceso en línea:https://dx.doi.org/10.1093/ptep/ptu132
http://cds.cern.ch/record/1743330
Descripción
Sumario:The OPERA experiment is searching for $\nu _\mu \rightarrow \nu _\tau$ oscillations in appearance mode, i.e., via the direct detection of $\tau$ leptons in $\nu _\tau$ charged-current interactions. The evidence of $\nu _\mu \rightarrow \nu _\tau$ appearance has been previously reported with three $\nu _\tau$ candidate events using a sub-sample of data from the 2008–2012 runs. We report here a fourth $\nu _\tau$ candidate event, with the $\tau$ decaying into a hadron, found after adding the 2012 run events without any muon in the final state to the data sample. Given the number of analyzed events and the low background, $\nu _\mu \rightarrow \nu _\tau$ oscillations are established with a significance of 4.2$\sigma$.

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