PHOTON POLARIZATION EFFECTS IN B-]S-GAMMA-G DECAY

We analyze the polarization properties of photons which are produced i n the unpolarized b-quark decay, b --> syg. Using the structure functi on formalism we carry out a general analysis of the polarization chara cteristics of y in terms of the standard Stokes parameters. The expres sions for five independent structure functions are constructed in term s of the weak magnetic transition form factors of the vertices b -->, sy and b --> sg. Numerical calculations of the Stokes parameters and v arious differential distributions for b --> syg are performed for the two-Higgs doublet model (2HDM). We studied the dependences of all thes e characteristics to the model parameters. These results were compared with the Standard Model predictions for different top quark masses. S trong sensitivity of the Stokes parameters, which defines the linear p hoton polarization, to the model is demonstrated.