On the decay mode B− → μ−νμγ

A QCD relativistic potential model is employed to compute the decay rate and the photon spectrum of the process B− → μ−νμγ. The result B(B− → μ−νμγ) ∼- 1 × 10−6 confirms the enhancement of this decay channel with respect to the purely leptonic mode, and supports the proposal of using this process to access relevant hadronic quantities such as the B-meson leptonic decay constant and the CKM matrix element Vub.