Computing the temperature dependence of effective CP violation in the standard model

Brauner T, Taanila O, Tranberg A, Vuorinen A (2012)
JHEP 2012(11).

Journal Article | Published | English

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Abstract
CP violation in the standard model originates from theCabibbo-Kobayashi-Maskawa mixing matrix. Upon integrating all fermions out ofthe theory, its effects are captured by a series of effective nonrenormalizableoperators for the bosonic gauge and Higgs fields. We compute the CP-violatingpart of the effective action to the leading nontrivial, sixth order in thecovariant gradient expansion as a function of temperature. In the limit of zerotemperature, our result addresses the discrepancy between two independentcalculations existing in the literature [1,2]. We find that CP violation in thestandard model is strongly suppressed at high temperature, but that at T<1GeVit may be relevant for certain scenarios of baryogenesis. We also identify aselected class of operators at the next, eighth order and discuss theconvergence of the covariant gradient expansion.
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Brauner T, Taanila O, Tranberg A, Vuorinen A. Computing the temperature dependence of effective CP violation in the standard model. JHEP. 2012;2012(11).
Brauner, T., Taanila, O., Tranberg, A., & Vuorinen, A. (2012). Computing the temperature dependence of effective CP violation in the standard model. JHEP, 2012(11).
Brauner, T., Taanila, O., Tranberg, A., and Vuorinen, A. (2012). Computing the temperature dependence of effective CP violation in the standard model. JHEP 2012.
Brauner, T., et al., 2012. Computing the temperature dependence of effective CP violation in the standard model. JHEP, 2012(11).
T. Brauner, et al., “Computing the temperature dependence of effective CP violation in the standard model”, JHEP, vol. 2012, 2012.
Brauner, T., Taanila, O., Tranberg, A., Vuorinen, A.: Computing the temperature dependence of effective CP violation in the standard model. JHEP. 2012, (2012).
Brauner, Tomás, Taanila, Olli, Tranberg, Anders, and Vuorinen, Aleksi. “Computing the temperature dependence of effective CP violation in the standard model”. JHEP 2012.11 (2012).
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