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Updated BBN bounds on the cosmological lepton asymmetry for non-zero 13

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Updated BBN bounds on the cosmological lepton asymmetry for non-zero 13

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dc.contributor.author	Mangano, Gianpiero
dc.contributor.author	Miele, Gennaro
dc.contributor.author	Pastor Carpi, Sergio
dc.contributor.author	Pisanti, Ofelia
dc.contributor.author	Sarikas, Srdjan
dc.date.accessioned	2013-11-25T11:57:21Z
dc.date.available	2013-11-25T11:57:21Z
dc.date.issued	2012
dc.identifier.citation	Mangano, Gianpiero Miele, Gennaro Pastor Carpi, Sergio Pisanti, Ofelia Sarikas, Srdjan 2012 Updated BBN bounds on the cosmological lepton asymmetry for non-zero 13 Physics Letters B 708 1 5
dc.identifier.uri	http://hdl.handle.net/10550/31408
dc.description.abstract	We discuss the bounds on the cosmological lepton number from Big Bang Nucleosynthesis (BBN), in light of recent evidences for a large value of the neutrino mixing angle theta(13), sin(2) theta(13) greater than or similar to 0.01 at 2 sigma. The largest asymmetries for electron and mu, tau neutrinos compatible with He-4 and H-2 primordial yields are computed versus the neutrino mass hierarchy and mixing angles. The flavour oscillation dynamics is traced till the beginning of BBN and neutrino distributions after decoupling are numerically computed. The latter contains in general, non-thermal distortion due to the onset of flavour oscillations driven by solar squared mass difference in the temperature range where neutrino scatterings become inefficient to enforce thermodynamical equilibrium. Depending on the value of theta(13), this translates into a larger value for the effective number of neutrinos, N-eff. Upper bounds on this parameter are discussed for both neutrino mass hierarchies. Values for N-eff which are large enough to be detectable by the Planck experiment are found only for the (presently disfavoured) range sin(2) theta(13) <= 0.01.
dc.relation.ispartof	Physics Letters B, 2012, vol. 708, p. 1-5
dc.subject	Partícules (Física nuclear)
dc.title	Updated BBN bounds on the cosmological lepton asymmetry for non-zero 13
dc.type	journal article	es_ES
dc.date.updated	2013-11-25T11:57:21Z
dc.identifier.doi	10.1016/j.physletb.2012.01.015
dc.identifier.idgrec	070778
dc.rights.accessRights	open access	es_ES
dc.identifier.url	10.1016/j.physletb.2012.01.015