Thursday, July 18, 2013

1307.4699 (M. Antonello et al.)

Search for anomalies in the νe appearance from a νμ beam    [PDF]

M. Antonello, B. Baibussinov, P. Benetti, F. Boffelli, A. Bubak, E. Calligarich, N. Canci, S. Centro, A. Cesana, K. Cieslik, D. B. Cline, A. G. Cocco, A. Dabrowska, D. Dequal, A. Dermenev, R. Dolfini, A. Falcone, C. Farnese, A. Fava, A. Ferrari, G. Fiorillo, D. Gibin, S. Gninenko, A. Guglielmi, M. Haranczyk, J. Holeczek, A. Ivashkin, J. Kisiel, I. Kochanek, J. Lagoda, S. Mania, A. Menegolli, G. Meng, C. Montanari, S. Otwinowski, P. Picchi, F. Pietropaolo, P. Plonski, A. Rappoldi, G. L. Raselli, M. Rossella, C. Rubbia, P. Sala, A. Scaramelli, E. Segreto, F. Sergiampietri, D. Stefan, R. Sulej, M. Szarska, M. Terrani, M. Torti, F. Varanini, S. Ventura, C. Vignoli, H. Wang, X. Yang, A. Zalewska, A. Zani, K. Zaremba
We report an updated result from the ICARUS experiment on the search for {\nu}{\mu} ->{\nu}e anomalies with the CNGS beam, produced at CERN with an average energy of 20 GeV and travelling 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 {\nu}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 x 10-3 and 7.6 x 10-3 respectively. The present result confirms, with an improved sensitivity, the early result already published by the ICARUS collaboration.
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