Study of semileptonic decay of in QCD sum rule

Abstract

In this work we study the semileptonic decay of (l = e, μ, τ) with the QCD sum rule method. We calculate the translation form factors relevant to this semileptonic decay, then the branching ratios of (l = e, μ, τ) decays are calculated with the form factors obtained here. Our result for the branching ratio of agree very well with the recent experimental data. For the unmeasured decay modes such as and , we give theoretical predictions.