Abstract
The publicly available spectrum generators for the NMSSM often lead to different predictions for the mass of the standard model-like Higgs boson, even though they all implement two-loop computations in the DR¯ renormalization scheme. Depending on the parameter point, the differences can exceed 5 GeV, and even reach 8 GeV for moderate superparticle masses of up to 2 TeV. It is shown here that these differences can be traced back to the calculation of the running standard model parameters entering all calculations, to the approximations used in the two-loop corrections included in the different codes, and to different choices for the renormalization conditions and scales. In particular, the importance of the calculation of the top Yukawa coupling is pointed out.
Highlights
That run II of the Large Hadron Collider (LHC) has started, either the first clear hints for new physics beyond the standard model (BSM) will show up or many well-motivated theories for BSM physics will come under even greater pressure
We have discussed the differences in the predictions for the scalar Higgs masses and mixings by public spectrum generators for the next-to-minimal supersymmetric standard model (NMSSM)
This has important consequences for phenomenological studies: For minimal supersymmetric standard model (MSSM)-like points, FlexibleSUSY, NMSSMTools, SOFTSUSY and SPheno usually agree quite well with each other, while NMSSMCALC returns in general a smaller value for the SM-like Higgs boson mass
Summary
That run II of the Large Hadron Collider (LHC) has started, either the first clear hints for new physics beyond the standard model (BSM) will show up or many well-motivated theories for BSM physics will come under even greater pressure. The large stop mixing needed to generate a Higgs mass of 125 GeV for stop masses around one TeV turns out to be dangerous because of charge and color breaking minima [3, 4, 5, 6, 7] This leads to the question of whether the MSSM is really a natural completion of the SM and has attracted more interest in other SUSY scenarios. A Z3 symmetry is often introduced to forbid all dimensionful parameters in the superpotential and to solve the μ problem of the MSSM at the same time [9] This realization of a singlet extension of the MSSM is the next-to-minimal supersymmetric standard model (NMSSM).
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