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arXiv · 2109.05847

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

Nikolay Kivel
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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.

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Nikolay Kivel. 2021-09-13. Baryon decays $J/\psi\rightarrow B\bar{B}$ within the QCD factorisation framework. https://doi.org/10.1140/epja%2Fs10050-021-00626-1

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