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Probing neutrino non-standard interactions with atmospheric neutrino data

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Probing neutrino non-standard interactions with atmospheric neutrino data

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dc.contributor.author Fornengo, Nicolao
dc.contributor.author Maltoni, Michele
dc.contributor.author Tomàs, Ricard
dc.contributor.author Furtado Valle, José Wagner
dc.date.accessioned 2015-10-19T12:12:21Z
dc.date.available 2015-10-19T12:12:21Z
dc.date.issued 2002
dc.identifier.citation Fornengo, Nicolao Maltoni, Michele Tomàs, Ricard Furtado Valle, José Wagner 2002 Probing neutrino non-standard interactions with atmospheric neutrino data Physical Review D 65 1 013010
dc.identifier.uri http://hdl.handle.net/10550/47780
dc.description.abstract We have reconsidered the atmospheric neutrino anomaly in light of the laetst data from Super-Kamiokande contained events and from Super-Kamiokande and MACRO up-going muons. We have reanalysed the proposed solution to the atmospheric neutrino anomaly in terms of non-standard neutrino-matter interactions (NSI) as well as the standard nu_mu -> nu_tau oscillations (OSC). Our statistical analysis shows that a pure NSI mechanism is now ruled out at 99%, while the standard nu_mu -> nu_tau OSC mechanism provides a quite remarkably good description of the anomaly. We therefore study an extended mechanism of neutrino propagation which combines both oscillation and non-standard neutrino-matter interactions, in order to derive limits on flavour-changing (FC) and non-universal (NU) neutrino interactions. We obtain that the off-diagonal flavour-changing neutrino parameter epsilon and the diagonal non-universality neutrino parameter epsilon' are confined to -0.03 < epsilon < 0.02 and |epsilon'| < 0.05 at 99.73% CL. These limits are model independent and they are obtained from pure neutrino-physics processes. The stability of the neutrino oscillation solution to the atmospheric neutrino anomaly against the presence of non-standard neutrino interactions establishes the robustness of the near-maximal atmospheric mixing and massive-neutrino hypothesis. The best agreement with the data is obtained for Delta_m^2 = 2.3*10^{-3} eV^2, sin^2(2*theta) = 1, epsilon = 6.7*10^{-3} and epsilon' = 1.1*10^{-3}, although the chi^2 function is quite flat in the epsilon and epsilon' directions for epsilon, epsilon' -> 0.
dc.language.iso eng
dc.relation.ispartof Physical Review D, 2002, vol. 65, num. 1, p. 013010
dc.subject Física
dc.title Probing neutrino non-standard interactions with atmospheric neutrino data
dc.type journal article es_ES
dc.date.updated 2015-10-19T12:12:21Z
dc.identifier.doi 10.1103/PhysRevD.65.013010
dc.identifier.idgrec 031781
dc.rights.accessRights open access es_ES

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