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., Gruwé; C., Mommaert; P., Vilain; G., Wilquet; R., Beyer; W., Flegel; H., Grote; T., Mouthuy; H., Øverås; J., Panman; A., Rozanov; K., Winter; G., Zacek; V., Zacek; F. W., Büsser; C., Foos; L., Gerland; T., Layda; F., Niebergall; G., Rädel; P., Stähelin; T., Voss; D., Favart; Grégoire, G. H.; E., Knoops; V., Lemaître; P., Gorbunov; E., Grigoriev; V., Khovansky; A., Maslennikov; W., Lippich; A., Nathaniel; A., Staude; J., Vogt; S., Buontempo; A. G., Cocco; A., Ereditato; G., Fiorillo; F., MARCHETTI STASI; V., Palladino; P., Strolin; Capone, Antonio; D., DE PEDIS; Dore, Ubaldo; A., FRENKEL RAMBALDI; Loverre, Pier Ferruccio; D., Macina; G., Piredda; R., Santacesaria; E., DI CAPUA; S., Ricciardi; B., Saitta; K., Hiller; R. NAHNHAUER AND H. E., Roloff. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - B309:(1993), pp. 463-468. [10.1016/0370-2693(93)90962-H]