Guo, Yuxun and Ji, Xiangdong and Liu, Yizhuang (2021) QCD analysis of near-threshold photon-proton production of heavy quarkonium. PHYSICAL REVIEW D, 103 (9): 096010. ISSN 2470-0010, 2470-0029
Full text not available from this repository. (Request a copy)Abstract
The near-threshold photo or electroproduction of heavy vector quarkonium off the proton is studied in quantum chromodynamics. Similar to the high-energy limit, the production amplitude can be factorized in terms of gluonic generalized parton distributions and the quarkonium distribution amplitude. At the threshold, the threshold kinematics has a large skewness parameter xi, leading to the dominance of the spin2 contribution over higher-spin twist-2 operators. Thus, threshold production data are useful to extract the gluonic gravitational form factors, allowing studying the gluonic contributions to the quantum anomalous energy, mass radius, spin, and mechanical pressure in the proton. We use the recent GlueX data on the J/Psi. photoproduction to illustrate the potential physics impact from the high-precision data from the future Jefferson Laboratory 12 GeV and Electron-Ion Collider physics program.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | HARD DIFFRACTIVE ELECTROPRODUCTION; VECTOR-MESONS; EXCLUSIVE PHOTOPRODUCTION; J/PSI-PHOTOPRODUCTION; WAVE-FUNCTIONS; DISTRIBUTIONS; FORCES; MASS |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 26 Aug 2022 06:34 |
| Last Modified: | 26 Aug 2022 06:34 |
| URI: | https://pred.uni-regensburg.de/id/eprint/47056 |
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