Article

# Extra vectorlike matter and the lightest Higgs scalar boson mass in low-energy supersymmetry

Physical review D: Particles and fields 02/2010; 81(3):035004-035004. DOI: 10.1103/PHYSREVD.81.035004

Source: arXiv

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**ABSTRACT:**Introducing heavy particles with strong couplings to the Higgs field can strengthen electroweak phase transition, through the entropy release mechanism from both bosons and fermions. We analyze the possibility of electroweak baryogenesis in the MSSM with new vector-like superfields. The new vector-like particles belong to the representation 5+5bar+10+10bar of SU(5). By analyzing in detail the effective potential at finite temperature, we show that a strongly first order electroweak phase transition in this model is ruled out by a combination of 125 GeV Higgs requirement, the bound for exotic quarks, the gluon fusion Higgs production rate and the Higgs diphoton decay rate as well as the electroweak precision measurement.Physical Review D 02/2014; 89(3). · 4.86 Impact Factor -
##### Article: Inert Higgs extension of the NMSSM

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**ABSTRACT:**We introduce one pair of inert Higgs doublets {H_d, H_u} and singlets {N^c, N}, and consider their couplings with the Higgs doublets of the minimal supersymmetric standard model (MSSM), W \supset y_N N^c h_u H_d + y_N' N h_d H_u. We assign extra U(1)_{Z'} gauge charges only to the extra vector-like superfields, and so all the MSSM superfields remain neutral under the new U(1)_{Z'}. They can be an extension of the "\lambda term," W \supset \lambda S h_u h_d in the next-to-MSSM (NMSSM). Due to the U(1)_{Z'}, the maximally allowed low energy value of y_N can be lifted up to 0.85, avoiding a Landau-pole (LP) below the grand unification scale. Such colorless vector-like superfields remarkably enhance the radiative MSSM Higgs mass particularly for large tan\beta through the y_N term and the corresponding holomorphic soft term. As a result, the lower bound of \lambda and the upper bound of tan\beta can be relaxed to disappear from the restricted parameter space of the original NMSSM, 0.6 < \lambda < 0.7 and 1< tan\beta < 3. Thus, the valid parameter space significantly expands up to 0 < \lambda < 0.7, 0 < y_N < 0.85, and 2 < tan\beta < 50, evading the LP problem and also explaining the 126 GeV Higgs mass naturally.Physical Review D 01/2014; 89(7). · 4.86 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**An analysis of the Dirac neutrino magnetic moment with standard model interactions gives $\mu_\nu\sim 3 \times 10^{-19} \mu_B (m_\nu/1 eV)$. The observation of a significantly larger magnetic moment will provide a clear signal of new physics beyond the standard model. The current experimental limits on the neutrino magnetic moments are orders of magnitude larger than the prediction with the standard model interactions and thus its test appears out of reach. Here we give an analysis of the Dirac neutrino magnetic moments within the framework of a minimal supersymmetric standard model extension with a vectorlike lepton generation. Specifically we compute the moments arising from the exchange of W and the charged leptons in the loop, as well as from the exchange of charginos, charged sleptons and charged mirror sleptons. It is shown that the neutrino moment in this case can be several orders of magnitude larger than the one with standard model like interactions, lying close to and below the current experimental upper limits and should be accessible in improved future experiment. A correlated prediction of the heaviest neutrino lifetimes from radiative decays to the lighter neutrinos via exchange of charginos and sleptons in the loops is also made. The predicted lifetimes are several orders of magnitudes smaller than the one with the standard model interactions and also lie close to the current experimental limits from analyses using the cosmic background neutrino data.Physical Review D 12/2013; 89(5). · 4.86 Impact Factor

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