Publications
Publication Information
| Title | Extracting Transition Generalized Parton Distributions From Hard Exclusive Pion-Nucleon Scattering |
| Authors | Zhite Yu, Jianwei Qiu |
| JLAB number | JLAB-THY-24-3985 |
| LANL number | (None) |
| Other number | DOE/OR/23177-7381 |
| Document Type(s) | (Journal Article) |
| Associated with EIC: | No |
| Supported by Jefferson Lab LDRD Funding: | No |
| Funding Source: | Nuclear Physics (NP) |
| Other Funding: | US Department of Energy U.S. National Science Foundation Wu-Ki Tung endowed fund |
|
Journal Compiled for Physical Review D Volume 109 Page(s) 074023 | |
| Publication Abstract: | We study the extraction of transition generalized parton distributions (GPDs) from production of two back-to-back high transverse momentum photons ($\gamma\gamma$) and a massive pair of leptons ($\ell^+\ell^-$) in hard exclusive pion-nucleon scattering. We argue that the exclusive scattering amplitude of both processes could be perturbatively factorized into pion distribution amplitude and nonperturbative transition GPDs, convoluted with perturbatively calculable short-distance matching coefficients. We demonstrate that the exclusive diphoton production is not only complementary to the Drell-Yan type dilepton production for extracting the GPDs, but also providing enhanced sensitivities for extracting the parton momentum fraction $x$-dependence of GPDs. We show that both exclusive observables are physically measurable at the J-PARC and AMBER experiment energies. If the target nucleon can be polarized, corresponding spin-asymmetries can offer additional sensitivities for extracting transition GPDs. |
| Experiment Numbers: | |
| Group: | THEORY CENTER |
| Document: | |
| DOI: | https://doi.org/10.1103/PhysRevD.109.074023 |
| Accepted Manuscript: | PhysRevD.109.074023.pdf |
| Supporting Documents: | |
| Supporting Datasets: | |