Authors
Michelangelo Ambrosio, R Antolini, C Aramo, G Auriemma, A Baldini, G C Barbarino, B C Barish, G Battistoni, R Bellotti, C Bemporad, P Bernardini, H Bilokon, V Bisi, C Bloise, C Bower, S Bussino, F Cafagna, M Calicchio, D Campana, M Carboni, M Castellano, S Cecchini, Fabrizio Cei, V Chiarella, BC Choudhary, Stephane Coutu, L De Benedictis, G De Cataldo, H Dekhissi, C De Marzo, I De Mitri, J Derkaoui, M De Vincenzi, Alessandra Di Credico, O Erriquez, C Favuzzi, C Forti, P Fusco, G Giacomelli, G Giannini, N Giglietto, M Giorgini, M Grassi, L Gray, A Grillo, F Guarino, P Guarnaccia, C Gustavino, A Habig, K Hanson, A Hawthorne, R Heinz, Y Huang, E Iarocci, E Katsavounidis, I Katsavounidis, E Kearns, H Kim, S Kyriazopoulou, E Lamanna, C Lane, DS Levin, P Lipari, NP Longley, MJ Longo, F Maaroufi, G Mancarella, G Mandrioli, S Manzoor, A Margiotta Neri, A Marini, D Martello, A Marzari-Chiesa, MN Mazziotta, C Mazzotta
Publication date
1998/8/27
Journal
Physics Letters B
Volume
434
Issue
3-4
Pages
451-457
Publisher
North-Holland
Description
We present a measurement of the flux of neutrino-induced upgoing muons (<Eν>∼ 100 GeV) using the MACRO detector. The ratio of the number of observed to expected events integrated over all zenith angles is 0.74 ±0.036 (stat) ±0.046 (systematic) ±0.13 (theoretical). The observed zenith distribution for −1.0≤cosθ≤−0.1 does not fit well with the no oscillation expectation, giving a maximum probability for χ2 of 0.1%. The acceptance of the detector has been extensively studied using downgoing muons, independent analyses and Monte Carlo simulations. The other systematic uncertainties cannot be the source of the discrepancies between the data and expectations. We have investigated whether the observed number of events and the shape of the zenith distribution can be explained by a neutrino oscillation hypothesis. Fitting either the flux or zenith distribution independently yields mixing parameters of sin22θ …
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Scholar articles
M Ambrosio, R Antolini, C Aramo, G Auriemma… - Physics Letters B, 1998