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Particles and Fields


Eur. Phys. J. C 21, 567-575 (2001)
DOI: 10.1007/s100520100758

Supersymmetric model contributions to B0d- $\bar B^0_d$ mixing and $B\to\pi\pi, \rho\gamma$ decays

A. Arhrib, C.-K. Chua and W.-S. Hou

Department of Physics, National Taiwan University, Taipei, Taiwan 10764, R.O.C.

(Received: 12 April 2001 / Revised version: 7 July 2001 / Published online: 24 August 2001 -© Springer-Verlag / Società Italiana di Fisica 2001 )

Abstract
Recent results from the Belle and BaBar Collaborations hint at a small $\sin2\phi_1$, while the measured $B\to\pi\pi$ rate also seems to be on the low side. Supersymmetric (SUSY) models with down squark mixings can account for the deficits in both cases. By studying the origin of SUSY contributions that could impact on B0d- $\bar B^0_d$ mixing and $B\to\pi\pi$ decay, we find that the former would most likely arise from left-left or right-right squark mixings, while the latter would come from left-right squark mixings. These two processes in general are not much correlated in the minimum supersymmetric standard model. If the smallness of $B\to\pi\pi$ is due to SUSY models, one would likely have a large $B\to\rho\gamma$ from chiral enhancement, and the rate could be within the present experimental reach. Even if $B\to\rho\gamma$ is not greatly enhanced, it could have large mixing dependent CP violation.



© Società Italiana di Fisica, Springer-Verlag 2001