Evidence for $\nu_\mu \to \nu_\tau$ appearance in the CNGS neutrino beam with the OPERA experiment

<p>The OPERA experiment is designed to search for <inline-formula><mml:math display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>ν</mml:mi></mml:mrow><mml:mrow><mml:mi>μ</mml:mi></mml:mrow></mml:msub><...

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Detalles Bibliográficos
Autores principales: Agafonova, N., Aleksandrov, A., Anokhina, A., Aoki, S., Ariga, A., Ariga, T., Asada, T., Autiero, D., Dhahbi, A.Ben, Badertscher, A., Bender, D., Bertolin, A., Bozza, C., Brugnera, R., Brunet, F., Brunetti, G., Buonaura, A., Buontempo, S., Buttner, B., Chaussard, L., Chernyavsky, M., Chiarella, V., 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., Favier, J., Ferber, T., Ferone, G., Fini, R.A., Fukuda, T., Galati, G., Garfagnini, A., Giacomelli, G., Goellnitz, C., Goldberg, J., Gornushkin, Y., Grella, G., Grianti, F., Guler, 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., Kawada, J., Kawahara, H., 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., 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., Rokujo, H., Roganova, T., Rosa, G., Rostovtseva, I., Rubbia, A., Ryazhskaya, O., Sato, O., Sato, Y., Schembri, A., Schmidt-Parzefal, W., 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., Strauss, T., Strolin, P., Suzuki, K., Takahashi, S., Tenti, M., Terranova, F., Tioukov, V., 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.
Lenguaje:eng
Publicado: 2014
Materias:
hep-ex
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.89.051102
http://cds.cern.ch/record/1642043
Descripción
Sumario:<p>The OPERA experiment is designed to search for <inline-formula><mml:math display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>ν</mml:mi></mml:mrow><mml:mrow><mml:mi>μ</mml:mi></mml:mrow></mml:msub><mml:mo>→</mml:mo><mml:msub><mml:mrow><mml:mi>ν</mml:mi></mml:mrow><mml:mrow><mml:mi>τ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math></inline-formula> oscillations in appearance mode, i.e., through the direct observation of the <inline-formula><mml:math display="inline"><mml:mi>τ</mml:mi></mml:math></inline-formula> lepton in <inline-formula><mml:math display="inline"><mml:msub><mml:mi>ν</mml:mi><mml:mi>τ</mml:mi></mml:msub></mml:math></inline-formula>-charged current interactions. The experiment has taken data for five years, since 2008, with the CERN Neutrino to Gran Sasso beam. Previously, two <inline-formula><mml:math display="inline"><mml:msub><mml:mi>ν</mml:mi><mml:mi>τ</mml:mi></mml:msub></mml:math></inline-formula> candidates with a <inline-formula><mml:math display="inline"><mml:mi>τ</mml:mi></mml:math></inline-formula> decaying into hadrons were observed in a subsample of data of the 2008–2011 runs. Here we report the observation of a third <inline-formula><mml:math display="inline"><mml:msub><mml:mi>ν</mml:mi><mml:mi>τ</mml:mi></mml:msub></mml:math></inline-formula> candidate in the <inline-formula><mml:math display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>τ</mml:mi></mml:mrow><mml:mrow><mml:mo>-</mml:mo></mml:mrow></mml:msup><mml:mo>→</mml:mo><mml:msup><mml:mrow><mml:mi>μ</mml:mi></mml:mrow><mml:mrow><mml:mo>-</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math></inline-formula> decay channel coming from the analysis of a subsample of the 2012 run. Taking into account the estimated background, the absence of <inline-formula><mml:math display="inline"><mml:msub><mml:mi>ν</mml:mi><mml:mi>μ</mml:mi></mml:msub><mml:mo>→</mml:mo><mml:msub><mml:mi>ν</mml:mi><mml:mi>τ</mml:mi></mml:msub></mml:math></inline-formula> oscillations is excluded at the <inline-formula><mml:math display="inline"><mml:mrow><mml:mn>3.4</mml:mn><mml:mtext> </mml:mtext><mml:mi>σ</mml:mi></mml:mrow></mml:math></inline-formula> level.</p>

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