NAGIOS: RODERIC FUNCIONANDO

Neutrino masses and their ordering: global data, priors and models

Repositori DSpace/Manakin

Valencià Castellano

Inici
Investigació
e-prints
22 - Física
Visualitza element

IMPORTANT: Aquest repositori està en una versió antiga des del 3/12/2023. La nova instal.lació está en https://roderic.uv.es/

Neutrino masses and their ordering: global data, priors and models

Mostra el registre parcial de l'element

dc.contributor.author	Gariazzo, Stefano
dc.contributor.author	Archidiacono, Maria
dc.contributor.author	Fernández de Salas, Pablo
dc.contributor.author	Mena Requejo, Olga
dc.contributor.author	Ternes, C. A.
dc.contributor.author	Tórtola Baixauli, María Amparo
dc.date.accessioned	2019-05-17T13:21:00Z
dc.date.available	2019-05-17T13:21:00Z
dc.date.issued	2018
dc.identifier.citation	Gariazzo, Stefano Archidiacono, Maria Fernández de Salas, Pablo Mena Requejo, Olga Ternes, C. A. Tórtola Baixauli, María Amparo 2018 Neutrino masses and their ordering: global data, priors and models Journal Of Cosmology And Astroparticle Physics 2018 03 011-1 011-22
dc.identifier.uri	http://hdl.handle.net/10550/70227
dc.description.abstract	We present a full Bayesian analysis of the combination of current neutrino oscillation, neutrinoless double beta decay and Cosmic Microwave Background observations. Our major goal is to carefully investigate the possibility to single out one neutrino mass ordering, namely Normal Ordering or Inverted Ordering, with current data. Two possible parametrizations (three neutrino masses versus the lightest neutrino mass plus the two oscillation mass splittings) and priors (linear versus logarithmic) are exhaustively examined. We find that the preference for NO is only driven by neutrino oscillation data. Moreover, the values of the Bayes factor indicate that the evidence for NO is strong only when the scan is performed over the three neutrino masses with logarithmic priors; for every other combination of parameterization and prior, the preference for NO is only weak. As a by-product of our Bayesian analyses, we are able to (a) compare the Bayesian bounds on the neutrino mixing parameters to those obtained by means of frequentist approaches, finding a very good agreement; (b) determine that the lightest neutrino mass plus the two mass splittings parametrization, motivated by the physical observables, is strongly preferred over the three neutrino mass eigenstates scan and (c) find that logarithmic priors guarantee a weakly-to-moderately more efficient sampling of the parameter space. These results establish the optimal strategy to successfully explore the neutrino parameter space, based on the use of the oscillation mass splittings and a logarithmic prior on the lightest neutrino mass, when combining neutrino oscillation data with cosmology and neutrinoless double beta decay. We also show that the limits on the total neutrino mass ∑ mν can change dramatically when moving from one prior to the other. These results have profound implications for future studies on the neutrino mass ordering, as they crucially state the need for self-consistent analyses which explore the best parametrization and priors, without combining results that involve different assumptions.
dc.language.iso	eng
dc.relation.ispartof	Journal Of Cosmology And Astroparticle Physics, 2018, vol. 2018, num. 03, p. 011-1-011-22
dc.subject	Partícules (Física nuclear)
dc.subject	Astrofísica
dc.title	Neutrino masses and their ordering: global data, priors and models
dc.type	journal article	es_ES
dc.date.updated	2019-05-17T13:21:00Z
dc.identifier.doi	10.1088/1475-7516/2018/03/011
dc.identifier.idgrec	127984
dc.rights.accessRights	open access	es_ES