Bayesian Inferring Nucleon Gravitational Form Factors via Near-Threshold 𝐽/𝜓 Photoproduction

With Bayesian inference, we investigate the impact of recent near-threshold 𝐽/𝜓 production measurements by the 𝐽/𝜓⁢007 experiment and GlueX Collaboration on the extraction of proton gravitational form factors. We apply the generalized parton distribution framework at the next to leading order and demonstrate a stable expansion for the near-threshold kinematics. We find that the experimental constraints are in good agreement with the state-of-the-art lattice simulations, where negative 𝐶_𝑞⁡(𝑡) and 𝐶_𝑔⁡(𝑡) are strongly preferred. This highlights a great potential to extract them from future high-precision experiments.. Authors: Guo, Yuxun [University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000286224480); Yuan, Feng [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000199793853); Zhao, Wenbin [University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000183246134). DOE Contract: AC02-05CH11231; SC0023646. Subjects: QCD phenomenology; form factors; nonrelativistic QCD; perturbative QCD