A description of charmonia decays $$J/\psi \rightarrow B\bar{B}$$ within the QCD factorisation framework

Abstract

AbstractDecays $$J/\psi \rightarrow B{\bar{B}}$$ J / ψ → B B ¯ into octet baryon-antibaryons pairs are studied within the QCD factorisation framework. The next-to-leading power correction to the leading-order decay amplitude is calculated for the first time. The phenomenological analysis also includes the interference with the electromagnetic decay $$J/\psi \rightarrow \gamma ^*\rightarrow B{\bar{B}}$$ J / ψ → γ ∗ → B B ¯ . The branching fractions and the angular coefficients $$\alpha _B$$ α B are obtained with an accuracy of about $$20\%$$ 20 % . The obtained results allow us to conclude that the calculated amplitudes provide a dominant contribution and therefore QCD factorisation provides a suitable basis for understanding of these decays.