Abstract
For the search for additional Higgs bosons in the Minimal Supersymmetric Standard Model (MSSM) as well as for future precision analyses in the Higgs sector a precise knowledge of their decay properties is mandatory. We evaluate all two-body decay modes of the heavy Higgs bosons into sfermions in the MSSM with complex parameters (cMSSM). The evaluation is based on a full one-loop calculation of all decay channels, also including hard QED and QCD radiation. The dependence of the heavy Higgs bosons on the relevant cMSSM parameters is analyzed numerically. We find sizable contributions to many partial decay widths. They are roughly of O(15%) of the tree-level results, but can go up to 30% or higher. The size of the electroweak one-loop corrections can be as large as the QCD corrections. The full one-loop contributions are important for the correct interpretation of heavy Higgs boson search results at the LHC and, if kinematically allowed, at a future linear e+e- collider. The evaluation of the branching ratios of the heavy Higgs bosons will be implemented into the Fortran code FeynHiggs.
Highlights
One of the most important tasks at the LHC is to search for physics effects beyond the Standard Model (SM), where the Minimal Supersymmetric Standard Model (MSSM) [1,2,3,4] is one of the leading candidates
In this paper we present for the first time a full one-loop calculation for all two-body sfermionic decay channels of the Higgs bosons in the cMSSM, taking into account soft and hard QED and QCD radiation
The upper plot shows the partial decay width with MH± varied; the lower plots show the complex phase φAb varied for h2 decays and h3 decays with parameters chosen according to S2
Summary
One of the most important tasks at the LHC is to search for physics effects beyond the Standard Model (SM), where the Minimal Supersymmetric Standard Model (MSSM) [1,2,3,4] is one of the leading candidates. Corrections at and beyond the one-loop level in the MSSM with real parameters (rMSSM) are implemented into the code HDECAY [39,40,41] Both codes were combined by the LHC Higgs Cross Section Working Group to obtain the most precise evaluation for rMSSM Higgs-boson decays to SM particles and decays to lighter Higgs bosons [42]. While their results constitute a full one-loop correction ( not for complex parameters), it differs from our calculation in the renormalization of the SUSY particles and parameters In this paper we present for the first time a full one-loop calculation for all two-body sfermionic decay channels of the Higgs bosons in the cMSSM (with no generation mixing), taking into account soft and hard QED and QCD radiation. The results will be implemented into the Fortran code FeynHiggs [33,34,35,36,37,38]
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