The angular distribution of upward-going muons produced by atmospheric neutrinos in the rock below the MACRO detector shows anomalies in good agreement with two flavor nu (mu) --> nu (tau) oscillations with maximum mixing and Deltam(2) around 0.0024 eV(2). Exploiting the dependence of magnitude of the matter effect on oscillation channel, and using a set of 809 upward-going muons observed in MACRO, we show that the two flavor nu (mu) --> nu (s) oscillation is disfavored with 99% C.L. with respect to nu (mu) --> nu (tau).
Matter effects in upward-going muons and sterile neutrino oscillations / Ambrosio, M., Antolini, R., Auriemma, G., Bakari, D., Baldini, A., Barbarino, G.C., Barish, B.C., Battistoni, G., Becherini, Y., Bellotti, R., Bemporad, C., Bernardini, P., Bilokon, H., Bisi, V., Bloise, C., Bower, C., Brigida, M., Bussino, S., Cafagna, F., Calicchio, M., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 517:1-2(2001), pp. 59-66. [10.1016/S0370-2693(01)00992-3]
Matter effects in upward-going muons and sterile neutrino oscillations
Giglietto, N;Nicolo, D;Spinelli, P;
2001
Abstract
The angular distribution of upward-going muons produced by atmospheric neutrinos in the rock below the MACRO detector shows anomalies in good agreement with two flavor nu (mu) --> nu (tau) oscillations with maximum mixing and Deltam(2) around 0.0024 eV(2). Exploiting the dependence of magnitude of the matter effect on oscillation channel, and using a set of 809 upward-going muons observed in MACRO, we show that the two flavor nu (mu) --> nu (s) oscillation is disfavored with 99% C.L. with respect to nu (mu) --> nu (tau).| File | Dimensione | Formato | |
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