Cosmic Microwave Background, Matter-Antimatter Asymmetry and Neutrino Masses

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dc.creatorBuchmuller, W.
dc.creatorDi Bari, P.
dc.creatorPlumacher, M.
dc.date2002-05-31
dc.date2007-08-10
dc.date.accessioned2026-07-07T11:31:15Z
dc.date.available2026-07-07T11:31:15Z
dc.descriptionWe study the implications of thermal leptogenesis for neutrino parameters. Assuming that decays of N_1, the lightest of the heavy Majorana neutrinos, initiate baryogenesis, we show that the final baryon asymmetry is determined by only four parameters: the CP asymmetry epsilon_1, the heavy neutrino mass M_1, the effective light neutrino mass \tilde{m}_1, and the quadratic mean \bar{m} of the light neutrino masses. Imposing the CMB measurement of the baryon asymmetry as constraint on the neutrino parameters, we show, in a model independent way, that quasi-degenerate neutrinos are incompatible with thermal leptogenesis. For maximal CP asymmetry epsilon_1, and neutrino masses in the range from (Δm^2_{sol})^{1/2} to (Δm^2_{atm})^{1/2}, the baryogenesis temperature is T_B = O(10^{10}) GeV.
dc.description28 pages, 14 figures included; v2: erratum added, M_1 lower bound in the strong wash-out regime (see Eq. (63)) relaxed by a factor 2/3
dc.identifierhttps://arxiv.org/abs/hep-ph/0205349
dc.identifierhttp://arxiv.org/abs/hep-ph/0205349
dc.identifierNucl.Phys.B643:367-390,2002; Erratum-ibid.B793:362,2008
dc.identifierdoi:10.1016/S0550-3213(02)00737-X 10.1016/j.nuclphysb.2007.11.030
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/197205
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Theory
dc.titleCosmic Microwave Background, Matter-Antimatter Asymmetry and Neutrino Masses
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