On Higgs and sphaleron effects during the leptogenesis era

Details On Higgs and sphaleron effects during the leptogenesis era On Higgs and sphaleron effects during the leptogenesis era

2005-12-04

arxiv.org/abs/hep-ph/0512052v2

JHEP 0601 (2006) 068

Physics

High Energy Physics

High Energy Physics - Phenomenology

one reference added

Scientific paper

10.1088/1126-6708/2006/01/068

We discuss the effects of various processes that can be active during the leptogenesis era, and present the Boltzmann equations that take them into account appropriately. A non-vanishing Higgs number asymmetry is always present, enhancing the washout of the lepton asymmetry. This is the main new effect when leptogenesis takes place at $T>10^{12}$ GeV, reducing the final baryon asymmetry and tightening the leptogenesis bound on the neutrino masses. If leptogenesis occurs at lower temperatures, electroweak sphalerons partially transfer the lepton asymmetry to a baryonic one, while Yukawa interactions and QCD sphalerons partially transfer the asymmetries of the left-handed fields to the right-handed ones, suppressing the washout processes. Depending on the specific temperature range in which leptogenesis occurs, the final baryon asymmetry can be enhanced or suppressed by factors of order 20%--40% with respect to the case when these effects are altogether ignored.

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