Supersymmetry and tensor coupling in

We study a possible explanation of the tensor currents in the weak radiative decay which was suggested recently by Bolotov et al. Phys. Lett. B 243 (1990) 308] and Poblaguev Phys. Lett. B 238 (1990) 108]. It can be shown that the supersymmetric particles can produce a tensor coupling at order (10⁻⁴−10⁻⁵)G_F which is 2–3 orders of magnitude smaller than the estimates extracted from the experimental data. A reliable calculation of the hadronic matrix element is done. The importance of a precision measurement of the tensor coupling in this decay is discussed as well as the possible relevance of the technicolour models.