Leptogenesis in B-L gauged SUSY with MSSM Higgs sector

TL;DR

This paper explores a modified $U(1)_{B-L}$ gauged MSSM model that generates sufficient CP violation through Higgs and sneutrino interactions to account for the universe's baryon asymmetry, supported by Monte Carlo analysis.

Contribution

It introduces a comprehensive analysis of all superpotential terms and couplings in the $B-L$ MSSM, demonstrating enhanced CP violation mechanisms for leptogenesis.

Findings

Model produces enough CP violation to explain baryon asymmetry.

Two dominant decay channels drive CP violation.

Monte Carlo analysis confirms significant CP violation in Higgs decays.

Abstract

We study a modified version of a $U(1)_{B-L}$ gauged MSSM that was recently shown to produce a new source of leptogenesis through the CP asymmetry of sneutrinos and antisneutrinos (K.S. Babu, Y. Meng, Z. Tavartkiladze, Phys Lett B681:37 (2009)). By taking all superpotential terms and couplings between the MSSM Higgs and $B-L$ scalar sectors into account we find that the model allows a large enough CP violation to explain the observed baryon number to entropy ratio. Monte Carlo analysis shows that a large amount of CP violation can be produced in the decays of the $B-L$ Higgs bosons and that there are two dominating channels that drive CP violation.