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

Abstract

Decays 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/ψ → γ * → B B. The branching fractions and the angular coefficients α B are obtained with an accuracy of about 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.