CP violation in $B\to \varphi K_S$ decay at large $\tan \beta$

Abstract

We consider the chargino contribution to the CP violation in $B\to \varphi K_S$ decay in the minimal supersymmetric standard model at large $\tan\be$. It is shown that the Wilson coefficient $C_{8g}$ of the chromomagnetic penguin operator can be significantly enhanced by the chargino-mediated diagrams while satisfying other direct/indirect experimental constraints. The enhanced $C_{8g}$ allows large deviation in the CP asymmetry from the standard model prediction, especially it can explain the apparent anomaly reported by BaBar and Belle.

arXiv comment10 pages, 3 figures, typos corrected, references added

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