$B\to \varphi K_s$ versus Electric Dipole Moment of ${}^{199}$Hg Atom in Supersymmetric Models with Right-handed Squark Mixing

Abstract

The correlation between the CP asymmetry in $B\to \varphi K_s$ ($S_{\varphi K_s}$) and the chromoelectric dipole moment (CEDM) of strange quark ($d_s^C$), which is constrained by the electric dipole moment (EDM) of ${}^{199}$Hg, is studied in the supersymmetric (SUSY) models with the right-handed squark mixing. It is known that, if the right-handed bottom and strange squarks have a CP-violating mixing, such as in the SUSY SU(5) GUT with right-handed neutrinos, the induced gluon-penguin diagram may give a sizable contribution to $S_{\varphi K_s}$. However, when the left-handed bottom and strange squarks also have a mixing, the conspiracy of the left and right-handed squarks may lead to a sizable $d_s^C$, which is enhanced by $m_b/m_s$. While the estimate for the EDM of ${}^{199}$Hg, induced by $d_s^C$, might have large uncertainties due to the hadron and nuclear dynamics, the current bound implies the gluon penguin contribution by the right-handed squarks to $S_{\varphi K_s}$ should be suppressed and the deviation of $S_{\varphi K_s}$ from the Standard Model may not be so large. Also, we discuss the constraint from the EDM of ${}^{199}$Hg in the SUSY SU(5) GUT with the right-handed neutrinos.

11 pages, 1 figure, version to appear in PLB

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