mixing in the minimal supergravity model

We investigate the effect of SUSY phases ( θA and θμ ) on the B 0 d−B 0 d mixing in the minimal supergravity model. It is known that the complex phase θA = arg(A) ( A is the universal coefficient of the trilinear scalar couplings ) is essentially unconstrained by the electric dipole moment experiment, while the phase θμ = arg(μ) ( μ is the supersymmetric Higgsino mass ) is strongly constrained to zero. We found that θA does not affect the phase of the B d−B 0 d mixing matrix element M12(B) by numerical analysis of the renormalization group equations. This means that the measurement of the B d−B 0 d mixing at the future B-factory could give the direct information on the parameters of the CKM matrix even in the framework of the minimal supergravity model with the SUSY phase θA. JSPS Research Fellow.