Radiative Leptonic Decays of Dₛ± and D± Mesons

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In this work, we investigate the radiative leptonic decays D(s)- → γℓ ν(ℓ = e, μ) at tree level within the non-relativistic consistuent quark model and the effective Lagrangian for the heavy flavor decays. We find that the contributions for the three Feynman diagrams are all important. With the full calculation, the decay branching ratios are of the order of 10-5 for Dₛ- → γℓ νand 10-6 for D- → γℓ ν, respectively. These decays can be measured at B factories and future CLEO-C experiments to determine the decay constants fDₛ and fD.