期刊
PHYSICS LETTERS B
卷 697, 期 5, 页码 463-470出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2011.02.025
关键词
Leptogenesis; CP asymmetry; Gauge boson scatterings
资金
- USA-NSF [PHY-0653342]
- MICINN [2007-66665-C02-01]
- INFN-MICINN [ACI2009-1038, CSD-2008-0037]
- CUR Generalitat de Catalunya [2009SGR502]
- Division Of Physics
- Direct For Mathematical & Physical Scien [969739] Funding Source: National Science Foundation
- ICREA Funding Source: Custom
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)gamma gauge bosons. Quantitatively however, the effects are not very different in size from those of scatterings with top quarks: the CP asymmetry per scattering is O(0.5-2) x the CP asymmetry per decay in all the relevant temperature range for leptogenesis and the generated baryon asymmetry can only be sizeably affected in leptogenesis models that are sensible to the T greater than or similar to M epoch. (C) 2011 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据