Sensitivity of the squark flavor mixing to the CP violation of K, B0 and Bs mesons

We study the sensitivity of the squark flavor mixing to the CP violating phenomena of $K$, $B^0$ and $B_s$ mesons in the framework of the split-family scenario, where the first and second family squarks are very heavy, ${cal O}(10)$TeV, on the other hand, the third family squark masses are at ${cal O}(1)$TeV. In order to constrain the gluino-sbottom-quark mixing parameters, we input the experimental data of the CP violations of $K$, $B^0$, and $B_s$ mesons, that is $epsilon_K$, $phi_d$, and $phi_s$. The experimental upper bound of the chromo-EDM of the strange quark is also input. In addition, we take account of the observed values $Delta M_{B^0}$, $Delta M_{B_s}$, the CKM mixing $|V_{ub}|$, and the branching ratio of $bto sgamma$. The allowed region of the mixing parameters are obtained as $|delta_{13}^{dL(dR)}|=0sim 0.01$ and $|delta_{23}^{dL(dR)}|=0sim 0.04$. By using these values, the deviations from the SM are estimated in the CP violations of the $B^0$ and $B_s$ decays. The deviation from the SM one is tiny in the CP asymmetries of $B^0to phi K_S$ and $B^0to eta K^0$ due to the chromo-EDM of the strange quark. On the other hand, the CP asymmetries $B_s to phi phi$ and $B_s to phi eta $ could be largely deviated from the SM predictions. We also predict the time dependent CP asymmetry of $B^0to K^0bar K^0$ and the semi-leptonic CP asymmetries of $B^0 to mu ^-X$ and $B_s to mu ^-X$. We expect those precise measurements at Belle II, which will provide us interesting tests for the squark flavor mixing.

SUSY contributions to CP violations in $bto s$ and $bto d$ transitions facing on new data

We study the contribution of the gluino-squark mediated flavor changing process for the CP violation in $bto s$ and $bto d$ transitions facing on recent experimental data. The mass insertion parameters of squarks are constrained by the branching ratios of $bto sgamma $ and $bto dgamma $ decays. In addition, the time dependent CP asymmetries of $B^0to phi K_S$ and $B^0to eta K^0$ decays severely restrict the allowed region of the mass insertion parameter for the $bto s$ transition. By using these constraints with squark and gluino masses of 1.5 TeV, we predict the CP asymmetries of $B_sto phi phi $, $B_sto eta phi $, and $B^0to K^0bar K^0$ decays, as well as the CP asymmetries in $bto sgamma $ and $bto dgamma $ decays. The CP violation in the $B_sto phi phi$ decay is expected to be large owing to the squark flavor mixing, which will be tested at LHCb soon.