Mass corrections in $J\mathrm{/}\psi \to B\bar{B}$ decay and the role of distribution amplitudes

We consider mass correction effects on the polar angular distribution of a baryon–antibaryon pair created in the chain decay process $e^-e^+ \to J/\psi \to B\bar B$, generalizing a previous analysis of Carimalo. We show the relevance of the features of the baryon distribution amplitudes and estimate the electromagnetic corrections to the QCD results.