Yukawa Interactions and Supersymmetric Electroweak Baryogenesis

TL;DR

This paper investigates how including bottom and tau Yukawa interactions affects supersymmetric electroweak baryogenesis, revealing a dependence of the baryon asymmetry on third-generation superpartner spectra and showing that leptonic interactions can dominate baryon number creation.

Contribution

It introduces the impact of bottom and tau Yukawa interactions into quantum transport equations, uncovering a new dependence of baryon asymmetry on third-generation superpartner spectra.

Findings

Baryon asymmetry varies with superpartner masses.

Leptonic interactions can dominate baryon creation.

Dependence on third-generation superpartners is significant.

Abstract

We analyze the quantum transport equations for supersymmetric electroweak baryogenesis including previously neglected bottom and tau Yukawa interactions and show that they imply the presence of a previously unrecognized dependence of the cosmic baryon asymmetry on the spectrum of third generation quark and lepton superpartners. For fixed values of the CP-violating phases in the supersymmetric theory, the baryon asymmetry can vary in both magnitude and sign as a result of the squark and slepton mass dependence. For light, right-handed top and bottom quark superpartners, the baryon number creation can be driven primarily by interactions involving third generation leptons and their superpartners.