B --> Phi K_S and Supersymmetry

Details B --> Phi K_S and Supersymmetry B --> Phi K_S and Supersymmetry

2002-12-06

arxiv.org/abs/hep-ph/0212092v3

Phys.Rev. D70 (2004) 035015

Physics

High Energy Physics

High Energy Physics - Phenomenology

33 pages, 32 figures, Updated version for PRD. Includes discussions of other recent works on this topic. Added discussions & p

Scientific paper

10.1103/PhysRevD.70.035015

The rare decay B --> Phi K_S is a well-known probe of physics beyond the Standard Model because it arises only through loop effects yet has the same time-dependent CP asymmetry as B --> Psi K_S. Motivated by recent data suggesting new physics in B --> Phi K_S, we look to supersymmetry for possible explanations, including contributions mediated by gluino loops and by Higgs bosons. Chirality-preserving LL and RR gluino contributions are generically small, unless gluinos and squarks masses are close to the current lower bounds. Higgs contributions are also too small to explain a large asymmetry if we impose the current upper limit on B(B_s --> mu mu). On the other hand, chirality-flipping LR and RL gluino contributions can provide sizable effects and while remaining consistent with related results in B --> Psi K_S, Delta M_s, B --> X_s gamma and other processes. We discuss how the LR and RL insertions can be distinguished using other observables, and we provide a string-based model and other estimates to show that the needed sizes of mass insertions are reasonable.

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