Measurements of atmospheric muon neutrino oscillations, global analysis of the data collected with MACRO detector

Ambrosio, M.; Antolini, R.; Bakari, D.; Baldini, A.; Barbarino, G. C.; Barish, B. C.; Battistoni, G.; Becherini, Yvonne; Bellotti, R.; Bemporad, C.; Bernardini, P.; Bilokon, H.; Bloise, C.; Bower, C.; Brigida, M.; Cafagna, F.; Campana, D.; Carboni, M.; Cecchini, S.; Cei, b. F.; Chiarella, V.; Choudhary, B. C.; Cosson, D.; Coutu, S.; De Cataldo, G.; Dekhissi, H.; De Marzo, C.; De Mitri, I.; Denni, U.; Derkauoi, J.; De Vincenzi, M.; Di Credico, A.; Favuzzi, C.; Forti, C.; Frani, A.; Fusco, P.; Giacomelli, GIORGIO MARIA; Giannini, G.; Giglietto, N.; Giorgini, Miriam; Grassi, M.; Grillo, A.; Guarino, F.; Gustavino, C.; Habig, A.; Hanson, K.; Heinz, R.; Iarocci, E.; Katsavounidis, E.; Katsavounidis, I.; Kearns, E.; Kim, H.; Kyriazopoulou, S.; Lamanna, E.; Lane, C.; Levin, D. S.; Lipari, P.; Longo, M. J.; Loparco, F.; Maaroufi, F.; Mancarella, G.; Mandrioli, G.; Manzoor, S.; Margiotta, Annarita; Marini, A.; Martello, D.; Marzari Chiesa, A.; Mazziotta, M. N.; Mengucci, A.; Michael, D. G.; Mikheyev, S.; Monacelli, P.; Montaruli, T.; Monteno, M.; Mufson, S.; Musser, J.; Nicolo, D.; Nolty, R.; Orth, C.; Osteria, G.; Palamara, O.; Patera, V.; Patrizii, L.; Pazzi, R.; Peck, C. W.; Perrone, L.; Petrera, S.; Popa, V.; Rain`o, l. A.; Reynoldson, J.; Ronga, F.; Satriano, C.; Scholberg, K.; Sciubba, A.; Sioli, Maximiliano; Sitta, M.; Spinelli, n. P.; Spinetti, M.; Spurio, Maurizio; Steinberg, R.; Stone, J. L.; Sulak, L. R.; Surdo, A.; Tarle’, G.; Togo, V.; Vakili, M.; Walter, C. W.; Webb, R.

doi:10.1140/epjc/s2004-01951-9

The final analysis of atmospheric neutrino events collected with the MACRO detector is presented. Three different classes of events, generated by neutrinos in different energy ranges, are studied looking at rates, angular distributions and estimated energies. The results are consistent for all the subsamples and indicate a flux deficit that depends on energy and path-length of neutrinos. The no-oscillation hypothesis is excluded at ~ 5sigma , while the hypothesis of nu mu -> nu tau oscillation gives a satisfactory description of all data. The parameters with highest probability in a two flavor scenario are sin 2 2theta m = 1 and Delta m2 = 0.0023 {eV}2. This result is independent of the absolute normalization of the atmospheric neutrino fluxes. The data can also be used to put experimental constrain on this normalization.

M. Ambrosio, R. Antolini, D. Bakari, A. Baldini, G. C. Barbarino, B. C. Barish, et al. (2004). Measurements of atmospheric muon neutrino oscillations, global analysis of the data collected with MACRO detector. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 3, 323-339 [10.1140/epjc/s2004-01951-9].