New insights in the electroweak phase transition in the NMSSM
Citations Over TimeTop 10% of 2015 papers
Abstract
We perform a detailed semianalytical analysis of the electroweak phase transition (EWPT) property in the Next-to-Minimal Supersymmetric standard model, which serves as a good benchmark model in which the 126 GeV Higgs mixes with a singlet. In this case, a strongly first-order electroweak phase transition (SFOEWPT) is achieved by the tree-level effects, and the phase transition strength ${\ensuremath{\gamma}}_{c}$ is determined by the vacua energy gap at $T=0$. We make an anatomy of the energy gap at both tree level and loop level and extract out a dimensionless phase transition parameter ${R}_{\ensuremath{\kappa}}\ensuremath{\equiv}4\ensuremath{\kappa}{v}_{s}/{A}_{\ensuremath{\kappa}}$, which can replace ${A}_{\ensuremath{\kappa}}$ in the parameterization and affect the light CP-odd/even Higgs spectra. We find that SFOEWPT only occurs in ${R}_{\ensuremath{\kappa}}\ensuremath{\sim}\ensuremath{-}1$ and positive ${R}_{\ensuremath{\kappa}}\ensuremath{\lesssim}\mathcal{O}(10)$, which in the non-PQ limit case would prefer either a relatively light CP-odd or CP-even Higgs boson $\ensuremath{\sim}(60,100)\text{ }\text{ }\mathrm{GeV}$, and therefore serves as a smoking gun signal and requires new search strategies at the LHC.