Baryon decays $J/\psi \to B\bar{B}$ within the QCD factorisation framework

Abstract

We investigate $J/\psi$ decays into octet baryon-antibaryons pairs. The decay amplitudes are computed within the collinear QCD factorisation framework. The subleading amplitude, which describes the decay of longitudinally polarised charmonium, is computed using twist-4 three-quark distribution amplitudes. The obtained results are used for a qualitative analysis of the experimental data. It is found that the polarisation parameter ${\alpha }_B$ can be described with an accuracy $10-30\%$, which may indicate that the pQCD contribution dominates this observable.

Comments: 19 pages, 3 tables, few typos are corrected