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A light stop and electroweak baryogenesis

D. Delepine, J. -M. Gerard, R. Gonzalez Felipe, J. Weyers

Abstract

The possibility of creating baryon asymmetry at the electroweak phase transition in the minimal supersymmetric standard model is considered for the case when right-handed squarks are much lighter than left-handed ones. It is shown that the usual requirement v(T_c)/T_c > 1 for baryogenesis can be satisfied in a range of the parameters of the model, consistent with present experimental bounds.

A light stop and electroweak baryogenesis

Abstract

The possibility of creating baryon asymmetry at the electroweak phase transition in the minimal supersymmetric standard model is considered for the case when right-handed squarks are much lighter than left-handed ones. It is shown that the usual requirement v(T_c)/T_c > 1 for baryogenesis can be satisfied in a range of the parameters of the model, consistent with present experimental bounds.

Paper Structure

This paper contains 23 equations, 2 figures.

Figures (2)

  • Figure 1: Dependence of the ratios $v(T_0)/T_0$ (solid line) and $v(T_1)/T_1$ (bold-dashed line) on the right-handed stop mass $m_{\tilde{t}_R}$ for the particular values of $\tan \beta = 1.5$, $m_L = 1$ TeV and $m_t=174$ GeV.
  • Figure 2: The curves $v(T_0)/T_0$ (solid line) and $v(T_1)/T_1$ (bold-dashed line) as functions of $\tan \beta$ for $m_R=0$, $m_L=500$ GeV and $m_t=174$ GeV.