PHOTON POLARIZATION IN B-S(D)-]2-GAMMA DECAYS

The Stokes parameters xi1 and xi2 for one of the produced photons, whi ch characterize the T-odd (and P-odd) linear polarization and P-odd ci rcular polarization in the B(s(d)) --> gammagamma decay are calculated . We show that these parameters are very sensitive to the t-quark mass for the B(s) --> gammagamma decay and also to the sign and the absolu te value of the ratio V(ub)/V(td) of the elements of Kobayashi-Maskawa matrix for the B(d) --> 2gamma decay, in the framework of the Standar d Model. It is further shown that in the two Higgs doublet model, ther e is some region of parameters (namely the mass of the charged physica l Higgs and vacuum expectation values) where the predictions for the p olarization effects of the photons differ from the Standard Model pred iction considerably.