Matter effects in upward-going muons and sterile neutrino oscillations

Citation
M. Ambrosio et al., Matter effects in upward-going muons and sterile neutrino oscillations, PHYS LETT B, 517(1-2), 2001, pp. 59-66
Citations number
39
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
0370-2693 → ACNP
Volume
517
Issue
1-2
Year of publication
2001
Pages
59 - 66
Database
ISI
SICI code
0370-2693(20010927)517:1-2<59:MEIUMA>2.0.ZU;2-P
Abstract
The angular distribution of upward-going muons produced by atmospheric neut rinos in the rock below the MACRO detector shows anomalies in good agreemen t 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 t he matter effect on oscillation channel, and using a set of 809 upward-goin g muons observed in MACRO, we show that the two flavor nu (mu) --> nu (s) o scillation is disfavored with 99% C.L. with respect to nu (mu) --> nu (tau) . (C) 2001 Elsevier Science B.V. All rights reserved.