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Mixing-induced CP violating sources for electroweak baryogenesis from a semiclassical approach

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Abstract

The effects of flavor mixing in electroweak baryogenesis is investigated in a generalized semiclassical WKB approach. Through calculating the non-adiabatic corrections to the particle currents, it is shown that extra CP violation sources arise from the off-diagonal part of the equation of motion of particles moving inside the bubble wall. This type of mixing-induced source is of first order in a derivative expansion of the Higgs condensate, but it is oscillation suppressed. The numerical importance of the mixing-induced source is discussed in the minimal supersymmetric standard model and compared with the source term induced by a semiclassical force. It is found that in a large parameter space where oscillation suppression is not strong enough, the mixing-induced source can dominate over that from the semiclassical force.

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  1. Korea Institute for Advanced Study, Seoul, 130-722, South Korea

    Yu-Feng Zhou

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  1. Yu-Feng Zhou
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Correspondence to Yu-Feng Zhou.

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Zhou, YF. Mixing-induced CP violating sources for electroweak baryogenesis from a semiclassical approach. Eur. Phys. J. C 58, 301–309 (2008). https://doi.org/10.1140/epjc/s10052-008-0753-9

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  • DOI: https://doi.org/10.1140/epjc/s10052-008-0753-9

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