Effects of Large CP-violating Soft Phases on Supersymmetric Electroweak Baryogenesis

TL;DR

This paper investigates how large CP-violating phases in supersymmetry can significantly enhance electroweak baryogenesis, suggesting the need for baryon asymmetry washout and revising the Higgs mass bounds.

Contribution

It incorporates all allowed large CP-violating phases into electroweak baryogenesis calculations, revealing their impact on baryon asymmetry and Higgs mass constraints.

Findings

Large CP-violating phases can produce baryon asymmetry exceeding observed levels.

Significant washout of asymmetry is necessary to match observations.

The upper bound on the light Higgs mass is increased compared to previous estimates.

Abstract

We revisit the results of recent electroweak baryogenesis calculations and include all allowed large CP-violating supersymmetric phases. If the phases are large, the resulting baryon asymmetry can be considerably larger than the observed value $n_B/s \sim 4 \times 10^{-11}$. Much of the asymmetry must therefore be washed out, and we argue that the upper bound on the light Higgs mass is larger than the value reported in previous work.