2021/09/30 by N. Kivel, Nikolay Kivel
Mathematics · Physics and Astronomy · #Algorithm #Amplitude #Bar (unit) #Baryon #Factorization #High-Energy Particle Collisions Research #Mathematics #Observable #Octet #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Quark #hep-ph
paper · pdf · doi:10.1140/epja/s10050-021-00626-1
19 pages, 3 tables, few typos are corrected
arxiv created 2022/01/14 · openalex publication_date 2022/02/01 · arxiv updated 2022/03/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We investigate J/ψ 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 αB can be described with an accuracy 10-30%, which may indicate that the pQCD contribution dominates this observable.