Search for ν_μ → ν_τ oscillation

Gruwé, M.; Mommaert, C.; Vilain, P.; Wilquet, G.; Beyer, R.; Flegel, W.; Grote, H.; Mouthuy, T.; Øverås, H.; Panman, J.; Rozanov, A.; Winter, K.; Zacek, G.; Zacek, V.; Büsser, F. W.; Foos, C.; Gerland, L.; Layda, T.; Niebergall, F.; Rädel, G.; Stähelin, P.; Voss, T.; Favart, D.; Grégoire, G. H.; Knoops, E.; Lemaître, V.; Gorbunov, P.; Grigoriev, E.; Khovansky, V.; Maslennikov, A.; Lippich, W.; Nathaniel, A.; Staude, A.; Vogt, J.; Buontempo, S.; Cocco, A. G.; Ereditato, A.; Fiorillo, G.; Marchetti Stasi, F.; Palladino, V.; Strolin, P.; Capone, Antonio; De Pedis, D.; Dore, Ubaldo; Frenkel Rambaldi, A.; Loverre, Pier Ferruccio; Macina, D.; Piredda, G.; Santacesaria, R.; Di Capua, E.; Ricciardi, S.; Saitta, B.; Hiller, K.; Roloff, R. Nahnhauer And H. E.

doi:10.1016/0370-2693(93)90962-H

The fine granularity of the CHARM-II detector has been exploited to search, in the CERN-SPS wide band neutrino beam, for quasi-elastic ντ interactions followed by the decay τ → πντ. Since the sampling thickness of the target calorimeter corresponds to 1/9 of an interaction length, these events appear in the detector as a single track followed by a hadronic shower. The study of the “single pion” events is used to set limits on the νμ → ντ oscillation parameters. The maximum sensitivity to the mixing angle θ is reached for Δm^2 = 50 eV2 allowing to exclude values of sin^2(2θ) greater than 6.4 × 10^−3 at 90% CL.

Search for ν_μ → ν_τ oscillation / M., G., C., M., P., V., G., W., R., B., W., F., H., G., T., M., H., Ø., J., P., A., R., K., W., G., Z., V., Z., F. W., B., C., F., L., G., T., L., F., N., G., R., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - B309:(1993), pp. 463-468. [10.1016/0370-2693(93)90962-H]