SuSpect: A Fortran code for the Supersymmetric and Higgs particle spectrum in the MSSM

Abstract

We present the Fortran code SuSpect version 2.3, which calculates the Supersymmetric and Higgs particle spectrum in the Minimal Supersymmetric Standard Model (MSSM). The calculation can be performed in constrained models with universal boundary conditions at high scales such as the gravity (mSUGRA), anomaly (AMSB) or gauge (GMSB) mediated supersymmetry breaking models, but also in the nonuniversal MSSM case with R-parity and CP conservation. Care has been taken to treat important features such as the renormalization group evolution of parameters between low and high energy scales, the consistent implementation of radiative electroweak symmetry breaking and the calculation of the physical masses of the Higgs bosons and supersymmetric particles taking into account the dominant radiative corrections. Some checks of important theoretical and experimental features, such as the absence of non desired minima, large fine-tuning in the electroweak symmetry breaking condition, as well as agreement with precision measurements can be performed. The program is simple to use, self-contained and can easily be linked to other codes; it is rather fast and flexible, thus allowing scans of the parameter space with several possible options and choices for model assumptions and approximations.* The program with all relevant information can be downloaded from the web at the http site: www.lpta.univ-montp2.fr/~kneur/Suspect or obtained by sending an E-mail to one of the authors,

Enhanced Higgs mass in a gaugino mediation model without the Polonyi problem

“…Here, we use SuSpect [20] to evaluate the spectrum of the SUSY particles. The boundary condition is taken such that all the scalar masses and trilinear coupling constants vanish and the gaugino masses are universal at the cut-off scale (which is taken to be the GUT scale).…”

Charged Higgs in view of the LHC constraints in phenomenological MSSM

“…The particle spectra are generated for more than 100M points using SOFTSUSY [2] and SUSPECT [3]. We impose the SUSY and Higgs mass limits from LEP and Tevatron as described in [4].…”

Thermal relic abundances of long-lived staus

“…In those models, the mass spectrum is found only after renormalization group (RG) evolution from the high scale down to the electroweak scale. Instead, we choose to work in the framework of the "phenomenological MSSM" (pMSSM), see, e.g., [51]. There, all soft-SUSY breaking parameters can be set at the scale of electroweak symmetry breaking-a low scale-which we fix to ∼ 2m e τ 1 .…”

“…For all channels in Table 1, we generate Fortran code for the squared matrix elements |M i | 2 by using the computer algebra packages FeynArts 5.4 [60,61] and FormCalc 5.3 [62,63]. For a chosen point in the SUSY parameter space, we then compute the radiatively corrected superparticle spectrum by running the spectrum generator SuSpect 2.40 [51]. Its output allows us to set all SUSY parameters so that we can compute the total cross 3 Counting wise we distinguish between e τ1 e τ * 1 → X and the conjugate process e τ * 1 e τ1 → X.…”

“…Using our own code for the computation of the resulting thermal relic stau abundance Y e τ , we examine explicitly (i) the effect of left-right mixing of the lighter stau, (ii) the effect of large stau-Higgs couplings, and (iii) stau annihilation at the resonance of the heavy CPeven Higgs boson H 0 . We consider both the "phenomenological MSSM" (pMSSM) (see, e.g., [51]) in which the soft SUSY breaking parameters can be set at the weak scale, and the CMSSM, in which the gaugino masses, the scalar masses, and the trilinear scalar couplings are assumed to take on the respective universal values m 1/2 , m 0 , and A 0 at the scale of grand unification M GUT ≃ 2 × 10 16 GeV. Within the framework of the pMSSM, we show examples in which Y e τ can be well below 10 −15 .…”