CP Violation from Scatterings with Gauge Bosons in Leptogenesis

Details CP Violation from Scatterings with Gauge Bosons in Leptogenesis CP Violation from Scatterings with Gauge Bosons in Leptogenesis

2010-10-11

arxiv.org/abs/1010.2209v1

Phys.Lett.B697:463-470,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 3 figures

Scientific paper

10.1016/j.physletb.2011.02.025

We present an explicit computation of the CP asymmetry in scattering processes involving the heavy right-handed neutrinos of the type I seesaw framework and the Standard Model gauge bosons. Compared to CP violation in two--body decays and in scatterings with top quarks there are new contributions at one loop in the form of new type of vertex corrections as well as of box diagrams. We show that their presence implies that, unlike the CP asymmetry in scatterings with top quarks, the CP asymmetry in scatterings with gauge bosons is different from the two-body decay asymmetry even for hierarchical right-handed neutrinos. This also holds for the L-conserving CP asymmetry in scatterings with U(1)$_Y$ gauge bosons.

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