2009/12/31 by H. Eberl, Helmut Eberl, Sebastian M. R. Frank +2
Mathematics · Physics and Astronomy · #Asymmetry #CP violation #Chargino #Combinatorics #Coupling (piping) #Gluino #Graph #High-Energy Particle Collisions Research #Large Hadron Collider #Mathematics #Minimal Supersymmetric Standard Model #Neutrino Physics Research #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quark #Top quark #Vertex (graph theory) #hep-ph
paper · pdf · doi:10.1140/epjc/s10052-010-1501-5
published as Eur.Phys.J.C70:1017-1024,2010 · Version accepted for publication in Eur. Phys. J. C (8 pages, 8 figures)
openalex publication_date 2010/11/25 · arxiv created 2010/12/06 · arxiv updated 2010/12/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
In the MSSM with complex parameters, loop corrections to the decay of a stop into a bottom quark and a chargino can lead to a CP violating decay rate asymmetry. We calculate this asymmetry at full one-loop level and perform a detailed numerical study, analyzing the dependence on the parameters and complex phases involved. If the stop can decay into a gluino, the self-energy and the vertex correction dominate due to the strong coupling. It is shown that the vertex contribution is always suppressed. We therefore give a simple approximate formula for the asymmetry. We account for the constraints on the parameters coming from several experimental limits. Asymmetries up to 25 percent are obtained. We also comment on the feasibility of measuring this asymmetry at the LHC.