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Electroweak baryogenesis and the Higgs and stop masses

Mariano Quiros

TL;DR

This work assesses electroweak baryogenesis within the MSSM, addressing whether a strong first-order phase transition and sufficient CP violation can occur inside collider-viable parameter ranges. It develops a resummed treatment of CP-violating chargino currents in a moving bubble wall and couples these to diffusion transport equations for particle densities, enabling a calculation of the baryon asymmetry. The study finds that a strong transition is possible in the light-stop window with a SM-like Higgs near $110$–$115$ GeV, and that achieving the observed BAU requires a CP-violating phase $\sin\varphi_\mu \gtrsim 0.04$, with exact values depending on $m_A$ and other SUSY parameters. These results indicate that MSSM electroweak baryogenesis remains viable under current experimental constraints, provided specific parameter regions and potential EDM suppression mechanisms are realized.

Abstract

In this talk we review the actual situation concerning electroweak phase transition and baryogenesis in the minimal supersymmetric extension of the Standard Model. A strong enough phase transition requires light Higgs and stop eigenstates. For a Higgs mass in the range 110--115 GeV, there is a stop window in the range 105--165 GeV. If the Higgs is heavier than 115 GeV, stronger constrains are imposed on the space of supersymmetric parameters. A baryon-to-entropy ratio is generated by the chargino sector provided that the $μ$ parameter has a CP-violating phase larger than $\sim$ 0.04.

Electroweak baryogenesis and the Higgs and stop masses

TL;DR

This work assesses electroweak baryogenesis within the MSSM, addressing whether a strong first-order phase transition and sufficient CP violation can occur inside collider-viable parameter ranges. It develops a resummed treatment of CP-violating chargino currents in a moving bubble wall and couples these to diffusion transport equations for particle densities, enabling a calculation of the baryon asymmetry. The study finds that a strong transition is possible in the light-stop window with a SM-like Higgs near – GeV, and that achieving the observed BAU requires a CP-violating phase , with exact values depending on and other SUSY parameters. These results indicate that MSSM electroweak baryogenesis remains viable under current experimental constraints, provided specific parameter regions and potential EDM suppression mechanisms are realized.

Abstract

In this talk we review the actual situation concerning electroweak phase transition and baryogenesis in the minimal supersymmetric extension of the Standard Model. A strong enough phase transition requires light Higgs and stop eigenstates. For a Higgs mass in the range 110--115 GeV, there is a stop window in the range 105--165 GeV. If the Higgs is heavier than 115 GeV, stronger constrains are imposed on the space of supersymmetric parameters. A baryon-to-entropy ratio is generated by the chargino sector provided that the parameter has a CP-violating phase larger than 0.04.

Paper Structure

This paper contains 6 sections, 20 equations, 6 figures, 1 table.

Table of Contents

  1. Introductory remarks
  2. The phase transition
  3. The CP-violating chargino currents
  4. The diffusion equations
  5. The baryon asymmetry
  6. Conclusions

Figures (6)

  • Figure 1: The absolute region of stability in the ($m_H,m_{\widetilde{t}_R}$) plane, for $m_Q=2$ TeV. The allowed region is inside the solid lines.
  • Figure 2: Plot of the sources $\gamma_{H,h}$, for the values of supersymmetric parameters specified in the text, as functions of $z/L_\omega$.
  • Figure 3: $\Delta\beta$, in units of $10^{-3}$, as a function of $m_A$ for the values of the supersymmetric and bubble parameters indicated in the text.
  • Figure 4: Plot of the different density-to-entropy ratios for the values of supersymmetric parameters specified in the text.
  • Figure 5: Plots of densities-to-entropy ratios $n_{H,h}/s$ as functions of $z/L_\omega$ for different values of $\Gamma_\mu$.
  • ...and 1 more figures