Computing the temperature dependence of effective CP violation in the standard model
Aug, 2012
34 pages
Published in:
- JHEP 11 (2012) 076
e-Print:
- 1208.5609 [hep-ph]
Report number:
- BI-TP-2012-38
View in:
Citations per year
Abstract: (arXiv)
CP violation in the standard model originates from the Cabibbo-Kobayashi-Maskawa mixing matrix. Upon integrating all fermions out of the theory, its effects are captured by a series of effective nonrenormalizable operators for the bosonic gauge and Higgs fields. We compute the CP-violating part of the effective action to the leading nontrivial, sixth order in the covariant gradient expansion as a function of temperature. In the limit of zero temperature, our result addresses the discrepancy between two independent calculations existing in the literature [1,2]. We find that CP violation in the standard model is strongly suppressed at high temperature, but that at T<1GeV it may be relevant for certain scenarios of baryogenesis. We also identify a selected class of operators at the next, eighth order and discuss the convergence of the covariant gradient expansion.Note:
- 34 pages, 5 eps figures, jheppub style/ v2: minor corrections, published version
- CP violation
- Standard Model
- Thermal Field Theory
- CP: violation
- temperature dependence
- expansion: gradient
- operator: nonrenormalizable
- effective action
- baryogenesis
- suppression
References(39)
Figures(5)
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