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Pure leptonic radiative decays of heavy-light mesons are calculated using avery simple non-relativistic model. Dominant contribution originates fromphoton emission from light initial quark. We find$BR(B^\pm\to\ell\nu\gamma)\sim3.5\times10^{-6}$ and $BR(D_s\to\ell\nu\gamma)\sim1.7 \times10^{-4}$. The importance of these reactions toclarify the dynamics of the annihilation graph is emphasized.Comment: 7 pages, LaTeX, 3 figure

PURE LEPTONIC RADIATIVE DECAYS B±, Ds→ℓνγ AND THE ANNIHILATION GRAPH

PURE LEPTONIC RADIATIVE DECAYS B^±, D_s→ℓνγ AND THE ANNIHILATION GRAPH