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Neutrino physics at the turn of the Millennium

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Neutrino physics at the turn of the Millennium

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dc.contributor.author Furtado Valle, José Wagner
dc.date.accessioned 2015-10-22T11:17:21Z
dc.date.available 2015-10-22T11:17:21Z
dc.date.issued 2000
dc.identifier.citation Furtado Valle, José Wagner 2000 Neutrino physics at the turn of the Millennium Physics of Atomic Nuclei 63 6 921 933
dc.identifier.uri http://hdl.handle.net/10550/47862
dc.description.abstract Recent solar & atmospheric nu-data strongly indicate need for physics beyond the Standard Model. I review the ways of reconciling them in terms of 3-nu oscillations. Though not implied by data, bi-maximal nu-mixing models emerge as a possibility. SUSY with broken R-parity provides an attractive way to incorporate it, opening the possibility of testing nu-anomalies at high- energy colliders such as the LHC or at the upcoming long-baseline or nu- factory experiments. Reconciling, in addition, the LSND hint requires a fourth, light sterile neutrino, nus. The simplest are the most symmetric scenarios, in which 2 of the 4 neutrinos are maximally-mixed and lie at the LSND scale, while the others are at the solar scale. The lightness of nus, the nearly maximal atmospheric mixing, and the solar/atmospheric splittings all follow naturally from the assumed lepton-number symmetry and its breaking. These basic schemes can be distinguished at neutral-current-sensitive solar & atmospheric neutrino experiments such as SNO. However underground experiments have not yet proven neutrino masses, as there are many alternatives. For example flavour changing interactions can play an important role in the explanation of solar and contained atmospheric data and could be tested e.g through \mu \to e + \gamma, \mu-e conversion in nuclei, unaccompanied by neutrino-less double beta decay. Conversely, a short-lived numu might play a role in the explanation of the atmospheric data. Finally, in the presence of a nus, a long-lived heavy nutau could delay the time at which the matter and radiation contributions to the energy density of the Universe become equal, reducing density fluctuations on smaller scales, thus saving the standard CDM scenario, while the light nue, numu and nus would explain the solar & atmospheric data.
dc.language.iso eng
dc.relation.ispartof Physics of Atomic Nuclei, 2000, vol. 63, num. 6, p. 921-933
dc.subject Física
dc.title Neutrino physics at the turn of the Millennium
dc.type journal article es_ES
dc.date.updated 2015-10-22T11:17:21Z
dc.identifier.doi 10.1134/1.855728
dc.identifier.idgrec 072180
dc.rights.accessRights open access es_ES

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