Electroweak phase transition in the MNMSSM with explicit CP violation

TL;DR

This paper investigates the conditions under which the MNMSSM with explicit CP violation can produce a strongly first-order electroweak phase transition, considering one-loop radiative corrections from top and stop quarks and their impact on Higgs sector mixing.

Contribution

It introduces the analysis of CP violation effects from stop quark mass non-degeneracy on the electroweak phase transition in the MNMSSM at the one-loop level.

Findings

A strongly first-order EWPT can occur without a very light stop quark.

The strength of the EWPT depends on the lightest Higgs mass and CP phase.

Radiative corrections induce scalar-pseudoscalar mixing in the Higgs sector.

Abstract

In explicit CP violation scenario of the minimal non-minimal supersymmetric standard model (MNMSSM), the possibility of a strongly first-order electroweak phase transition (EWPT) is investigated at the one-loop level, where the radiative corrections from the loops of the top and stop quarks are taken into account. Assuming that the stop quark masses are not degenerate, the radiative corrections due to the stop quarks give rise to a CP phase, which triggers the scalar-pseudoscalar mixing in the Higgs sector of the MNMSSM. The lighter stop quark need not always to have a small mass in order to ensure the strongly first-order EWPT. In the MNMSSM with explicit CP violation, it is found that the strength of the first-order EWPT depends on several factors, such as the lightest neutral Higgs boson mass and the nontrivial CP phase arising from stop quark masses. The effects of these factors are discussed.