Pure Leptonic Radiative Decays B^pm, D_stoellνγ and the Annihilation Graph
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✦ hep-ph
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gammaannihilationdecaysgraphleptonicpureradiativetimes10
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Pure leptonic radiative decays of heavy-light mesons are calculated using a very simple non-relativistic model. Dominant contribution originates from photon 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 to clarify the dynamics of the annihilation graph is emphasized.
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