The lightest CP-even Higgs boson h in the minimum supersymmetric standard model (MSSM) has a mass upper bound depending on the top quark and squark masses. An ee collider with enough energy and luminosity to produce h + Z at measurable rates up to the maximum h mass would cover the entire MSSM parameter space, if h+A production was also searched for. We explore the energy and/or luminosity need...

The minimal supersymmetric extension of standard model (MSSM) is examined by analyzing its quantum effects on the precision electroweak measurements and the muon g − 2. We examine carefully the effects of light charginos and neutralinos that are found to improve the fit to the electroweak data. We identify two distinct regions on the (μ,M2)-plane that fit well to the electroweak data and give s...

Diagrammatic two-loop results are presented for the leading QCD corrections to the masses of the neutral CP-even Higgs bosons in the Minimal Supersymmetric Standard Model (MSSM). The results are valid for arbitrary values of the parameters of the Higgs and scalar top sector of the MSSM. Their impact on a precise prediction for the mass of the lightest Higgs boson is briefly discussed. The MSSM ...

We present the program SuSpect3 that calculates masses and couplings of Higgs supersymmetric particles predicted by Minimal Supersymmetric Standard Model (MSSM). The model is implemented in both its non-constrained version, MSSM, constrained versions, such as minimal supergravity gauge or anomaly mediated supersymmetry breaking models, which soft supersymmetry–breaking parameters obey certain u...

We show that the current LEP2 lower bound upon the benchmark MSSM lightest Higgs mass rules out quasi-fixed scenarios for string scales between 10 8 and 10 14 GeV. We consider the implications for charge and colour breaking (CCB) bounds in the MSSM, and demonstrate that CCB bounds from F and D-flat directions are significantly weakened. For scales less than 10 10 GeV these bounds become merely ...

Precision electroweak measurements provide a window to physics beyond the Standard Model by constraining the size of radiative corrections from new particles and interactions. In this contribution, we summarize the constraints from the LEP and SLD data on an R–parity violating extension to the MSSM. Details are presented in Ref. 1. We extend the MSSM with the addition of the the following terms...

The possibility is discussed to observe the sparticle decay modes of the heavy MSSM Higgs bosons at the Large Hadron Collider. We focus on the heavy neutral Higgses H and A, and argue that their decay into neutralinos may access an interesting region in MSSM parameter space up to mA = 450 GeV for low and intermediate values of tanβ. If neutralinos and sleptons are light enough, the H, A → χ02χ ...

Recent studies of QCD and MSSM processes are discussed. These processes are handled with the GRACE system, which is a package of the automatic calculation of the amplitude based on the standard model (SM) and the minimal supersymmetric extension of the standard model (MSSM), are discussed. In order to evaluate multi-loop diagrams, we have developed the direct computation method (DCM). As an app...

We discuss the large radiative corrections to the masses of supersymmetric Higgs bosons in the MSSM and in its simplest extension, the NMSSM, with particular attention paid to the bounds on the lightest CP-even Higgs mass found in both models. In the case of the MSSM, these corrections are found to be primarily associated with the effects top quark and stop squark loops, while for extended mode...

Various aspects of the Higgs boson phenomenology of the Minimal Supersymmetric Standard Model (MSSM) are reviewed. Emphasis is put on the effects of higher-order corrections. The masses and couplings are discussed in the MSSM with real and complex parameters. Higherorder corrections to Higgs boson production channels at a prospective e+e− linear collider are investigated. Corrections to Higgs b...