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The minimal 3+2 neutrino model versus oscillation anomalies

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The minimal 3+2 neutrino model versus oscillation anomalies

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dc.contributor.author	Donini, Andrea
dc.contributor.author	Hernández Gamazo, Pilar
dc.contributor.author	López Pavón, Jacobo
dc.contributor.author	Maltoni, Michele
dc.contributor.author	Schwetz, Thomas
dc.date.accessioned	2015-04-24T11:16:16Z
dc.date.available	2015-04-24T11:16:16Z
dc.date.issued	2012
dc.identifier.citation	Donini, Andrea Hernández Gamazo, Pilar López Pavón, Jacobo Maltoni, Michele Schwetz, Thomas 2012 The minimal 3+2 neutrino model versus oscillation anomalies Journal of High Energy Physics 07 7 161-1 161-20
dc.identifier.uri	http://hdl.handle.net/10550/43375
dc.description.abstract	We study the constraints imposed by neutrino oscillation experiments on the minimal extension of the Standard Model that can explain neutrino masses, which requires the addition of just two singlet Weyl fermions. The most general renormalizable couplings of this model imply generically four massive neutrino mass eigenstates while one remains massless: it is therefore a minimal 3+2 model. The possibility to account for the confirmed solar, atmospheric and long-baseline oscillations, together with the LSND/MiniBooNE and reactor anomalies is addressed. We find that the minimal model can fit oscillation data including the anomalies better than the standard 3ν model and similarly to the 3+2 phenomenological models, even though the number of free parameters is much smaller than in the latter. Accounting for the anomalies in the minimal model favours a normal hierarchy of the light states and requires a large reactor angle, in agreement with recent measurements. Our analysis of the model employs a new parametrization of seesaw models that extends the Casas-Ibarra one to regimes where higher order corrections in the light-heavy mixings are significant.
dc.language.iso	eng
dc.relation.ispartof	Journal of High Energy Physics, 2012, vol. 07, num. 7, p. 161-1-161-20
dc.subject	Física
dc.title	The minimal 3+2 neutrino model versus oscillation anomalies
dc.type	journal article	es_ES
dc.date.updated	2015-04-24T11:16:17Z
dc.identifier.doi	10.1007/JHEP07(2012)161
dc.identifier.idgrec	080204
dc.rights.accessRights	open access	es_ES