2015/05/14 by Zhan Sun, Hong-Fei Zhang · 1 citation
Physics and Astronomy · #Hadron #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Physics beyond the Standard Model #Polarization (electrochemistry) #Production (economics) #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Scaling #hep-ph
paper · pdf · doi:10.1088/1674-1137/42/4/043104
arxiv created 2015/05/14 · openalex created_date 2016/06/24 · openalex publication_date 2018/04/01 · arxiv updated 2018/04/18 · openalex updated_date 2026/08/05
A thorough study reveals that the only key parameter for ψ (J/ψ, ψ') polarization at hadron colliders is the ratio , if the velocity scaling rule holds. A slight variation of this parameter results in substantial change of the ψ polarization. We find that with equally good description of the yield data, this parameter can vary significantly. Fitting the yield data is therefore incapable of determining this parameter, and consequently, of determining the ψ polarization. We provide a universal approach to fixing the long-distance matrix elements (LDMEs) for J/ψ and ψ' production. Further, with the existing data, we implement this approach, obtain a favorable set of the LDMEs, and manage to reconcile the charmonia production and polarization experiments, except for two sets of CDF data on J/ψ polarization.