Flavor Composition of the High-Energy Neutrino Events in IceCube
NAGIOS: RODERIC FUNCIONANDO

Flavor Composition of the High-Energy Neutrino Events in IceCube

DSpace Repository

Flavor Composition of the High-Energy Neutrino Events in IceCube

Show simple item record

dc.contributor.author Mena Requejo, Olga
dc.contributor.author Palomares Ruiz, Sergio
dc.contributor.author Vincent, Aaron C.
dc.date.accessioned 2015-04-20T10:46:56Z
dc.date.available 2015-04-20T10:46:56Z
dc.date.issued 2014
dc.identifier.uri http://hdl.handle.net/10550/43238
dc.description.abstract The IceCube experiment has recently reported the observation of 28 high-energy (> 30 TeV) neutrino events, separated into 21 showers and 7 muon tracks, consistent with an extraterrestrial origin. In this Letter, we compute the compatibility of such an observation with possible combinations of neutrino flavors with relative proportion (alpha(e:)alpha(mu):alpha tau)(circle plus). Although the 7: 21 track-to-shower ratio is naively favored for the canonical (1:1:1)(circle plus) at Earth, this is not true once the atmospheric muon and neutrino backgrounds are properly accounted for. We find that, for an astrophysical neutrino E-2 energy spectrum, (1:1:1)(circle plus). at Earth is disfavored at 81% C. L. If this proportion does not change, 6 more years of data would be needed to exclude (1:1:1)(circle plus) at Earth at 3 sigma C.L. Indeed, with the recently released 3-yr data, that flavor composition is excluded at 92% C. L. The best fit is obtained for (1:0:0)(circle plus). at Earth, which cannot be achieved from any flavor ratio at sources with averaged oscillations during propagation. If confirmed, this result would suggest either a misunderstanding of the expected background events or a misidentification of tracks as showers, or even more compellingly, some exotic physics which deviates from the standard scenario.
dc.language.iso eng
dc.relation.ispartof Physical Review Letters, 2014, vol. 113, num. 9, p. 091103
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source Mena Requejo, Olga Palomares Ruiz, Sergio Vincent, Aaron C. 2014 Flavor Composition of the High-Energy Neutrino Events in IceCube Physical Review Letters 113 9 091103
dc.subject Física
dc.title Flavor Composition of the High-Energy Neutrino Events in IceCube
dc.type info:eu-repo/semantics/article
dc.date.updated 2015-04-20T10:46:56Z
dc.identifier.doi http://dx.doi.org/10.1103/PhysRevLett.113.091103
dc.identifier.idgrec 102125

View       (522.0Kb)

This item appears in the following Collection(s)

Show simple item record

Search DSpace

Advanced Search

Browse

Statistics