Chargino Contributions in $B\to \varphi K_S$ Asymmetry

Abstract

CP asymmetry in $B\to \varphi K_S$ decay is studied in a special context of supersymmetry theories, in which the charginos play an important role. We find that in addition to the gluino, chargino can also make large contributions to CP asymmetry in $B\to \varphi K_S$ decay. After considering the constraints from $B\to J/psi{K}_S$ decay, we study three special scenarios: (a). Large mixing on left-handed charm and top squarks (LL mixing); (b). Large mixing on right-handed charm and top squarks (RR mixing); (c). Large mixing on left-handed charm and top squarks plus right-handed charm and top squarks (LL + RR mixing). We show quantitatively that because of large squark mixing within second and third generations, an $\mathcal{O}$(1) effect on CP violation in $B\to \varphi K_S$ is possible.

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• CP asymmetry in B \to phi K_S in a SUSY SO(10) GUT
• New Physics in b --> s bar(s) s Decay
• Time dependent CP asymmetry in $B^0\to {\rho }^0\gamma$ decay to probe the origin of CP violation