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 Higgs bosons into charginos and neutralinos 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 radiation. We restricted ourselves to a version of our renormalization scheme which is valid for \(|M_1| < |M_2|, |\mu |\) and \(M_2 \ne \mu \) to simplify the analysis, even though we are able to switch to other parameter regions. The dependence of the Higgs boson predictions on the relevant cMSSM parameters is analyzed numerically. We find sizable contributions to many partial decay widths. They are roughly of 10 % of the tree-level results, but they can go up to 20 % or higher. 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. There are plans to implement the evaluation of the branching ratios of the Higgs bosons into the Fortran code FeynHiggs, together with an automated choice of the renormalization scheme valid for the full cMSSM parameter space.
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
If SUSY is realized in nature and the charged Higgs-boson mass is MH± 1.5 TeV, the heavy Higgs bosons could be detectable at the LHC [12,13] and/or at a future linear e+e− collider such as the ILC [15,16,17,18,19] or CLIC [20,21]. (Results on the combination of LHC and ILC results can be found in Refs. [22,23,24].) The discovery potential at the HL-LHC goes up to O(1 TeV) for large tan β values and somewhat lower at low tan β values
In this work we take another step in the direction of completion of the calculation of all two-body decays at the one-loop level in the cMSSM in this stable and reliable renormalization scheme: we calculate all two-body decay modes of the Higgs bosons to charginos and neutralinos in the cMSSM
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. Decays to (lighter) Higgs bosons have been evaluated at the full one-loop level in the cMSSM in Ref. Within the cMSSM a full one-loop calculation of Higgs boson decays to scalar fermions has recently been published in Ref. In this paper we present a full one-loop calculation for all two-body decay channels of the Higgs bosons into charginos and neutralinos in the cMSSM, taking into account soft and hard QED radiation. 5. There are plans to implement the evaluation of the branching ratios of the heavy Higgs bosons into the Fortran code FeynHiggs [39,40,41,42,43,44], together with an automated choice of the renormalization scheme valid for the full cMSSM parameter space
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