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High Energy Physics - Phenomenology

arXiv:1503.00629 (hep-ph)
[Submitted on 2 Mar 2015 (v1), last revised 11 May 2015 (this version, v2)]

Title:Flavour always matters in scalar triplet leptogenesis

Authors:Stéphane Lavignac, Benoît Schmauch
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Abstract:We present a flavour-covariant formalism for scalar triplet leptogenesis, which takes into account the effects of the different lepton flavours in a consistent way. Our main finding is that flavour effects can never be neglected in scalar triplet leptogenesis, even in the temperature regime where all charged lepton Yukawa interactions are out of equilibrium. This is at variance with the standard leptogenesis scenario with heavy Majorana neutrinos. In particular, the so-called single flavour approximation leads to predictions for the baryon asymmetry of the universe that can differ by a large amount from the flavour-covariant computation in all temperature regimes. We investigate numerically the impact of flavour effects and spectator processes on the generated baryon asymmetry, and find that the region of triplet parameter space allowed by successsful leptogenesis is significantly enlarged.
Comments: 43 pages, 15 figures; comments and references added, cosmetic changes in Figs. 6 to 8, results unaffected. Version to appear in JHEP
Subjects: High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:1503.00629 [hep-ph]
  (or arXiv:1503.00629v2 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.1503.00629

Submission history

From: Stéphane Lavignac [view email]
[v1] Mon, 2 Mar 2015 17:30:11 UTC (1,648 KB)
[v2] Mon, 11 May 2015 12:45:59 UTC (1,686 KB)
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