Journal Article

Search for anomalies in the nu^sub e^ appearance from a nu^sub mu^ beam

Picchi, P, Raselli, G L, Canci, N, Cesana, A, Falcone, A, Menegolli, A, Montanari, C, Segreto, E, Rubbia, C, Meng, G, Zalewska, A, Farnese, C, Fiorillo, G, Holeczek, J, Centro, S, Kochanek, I, Pietropaolo, F, Rappoldi, A, Benetti, P, Scaramelli, A, Baibussinov, B, Yang, X, Cline, D B, Varanini, F, Dequal, D, Dermenev, A, Cielik, K, Guglielmi, A, Kisiel, J, Szarska, M, Torti, M, Lagoda, J, Kirsanow, M, Stefan, D, Zaremba, K, Ferrari, A, Ventura, S, Dolfini, R, Vignoli, C, Sala, P, Antonello, M, Plonski, P, Dabrowska, A, Rossella, M, Haranczyk, M, Fava, A, Terrani, M, Sulej, R, Boffelli, F, Mania, S, Sergiampietri, F, Otwinowski, S, Cocco, A G, Gninenko, S, Wang, H G, Bubak, A, Gibin, D, Calligarich, E, Zani, A

2013

Overview

We report an updated result from the ICARUS experiment on the search for ν ^sub [mu]^[arrow right]ν ^sub e^ anomalies with the CNGS beam, produced at CERN with an average energy of 20 GeV and traveling 730 km to the Gran Sasso Laboratory. The present analysis is based on a total sample of 1995 events of CNGS neutrino interactions, which corresponds to an almost doubled sample with respect to the previously published result. Four clear ν ^sub e^ events have been visually identified over the full sample, compared with an expectation of 6.4±0.9 events from conventional sources. The result is compatible with the absence of additional anomalous contributions. At 90 % and 99 % confidence levels, the limits to possible oscillated events are 3.7 and 8.3 respectively. The corresponding limit to oscillation probability becomes consequently 3.4×10^sup -3^ and 7.6×10^sup -3^, respectively. The present result confirms, with an improved sensitivity, the early result already published by the ICARUS Collaboration.

• Publisher: Springer Nature B.V