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Heavy Scalar Top Quark Decays in the Complex MSSM: A Full One-Loop Analysis

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arxiv 1111.7289 v2 pith:GFJTX6B7 submitted 2011-11-30 hep-ph

classification hep-ph
keywords quarkscalardecayheavycomplexparametersbranchingcmssm
verification ladder T0 review T1 audit T2 compute T3 formal
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We evaluate all two-body decay modes of the heavy scalar top quark in the Minimal Supersymmetric Standard Model with complex parameters (cMSSM) and no generation mixing. The evaluation is based on a full one-loop calculation of all decay channels, also including hard QED and QCD radiation. The renormalization of the complex parameters is described in detail. The dependence of the heavy scalar top quark decay on the relevant cMSSM parameters is analyzed numerically, including also the decay to Higgs bosons and another scalar quark or to a top quark and the lightest neutralino. We find sizable contributions to many partial decay widths and branching ratios. They are roughly of O(10%) of the tree-level results, but can go up to 30% or higher. These contributions are important for the correct interpretation of scalar top quark decays at the LHC and, if kinematically allowed, at the ILC. The evaluation of the branching ratios of the heavy scalar top quark will be implemented into the Fortran code FeynHiggs.

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Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Light Neutral Higgs-Boson Production at $e^+e^-$ Colliders in the Complex MSSM and NMSSM: A Full One-Loop Analysis

    hep-ph 2025-07 conditional novelty 6.0 of 10

    First full one-loop computation of e+e- -> h1 Z in the cNMSSM: corrections near -10%, nearly identical to the MSSM once the light Higgs mass is fixed.

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