Extracting transition generalized parton distributions from hard exclusive pion-nucleon scattering

Qiu, Jian-Wei; Yu, Zhite

doi:10.1103/physrevd.109.074023

Title: Extracting transition generalized parton distributions from hard exclusive pion-nucleon scattering

Journal Article · 22 April 2024 · Physical Review. D.

DOI: https://doi.org/10.1103/physrevd.109.074023 · OSTI ID:2339905

Qiu, Jian-Wei ^[1];

^[2]

Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); College of William and Mary, Williamsburg, VA (United States)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Michigan State University, East Lansing, MI (United States)

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.

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE; National Science Foundation (NSF); Wu-Ki Tung

Grant/Contract Number:: AC05-06OR23177; PHY-2013791

OSTI ID:: 2339905

Alternate ID(s):: OSTI ID: 2339777

Report Number(s):: JLAB-THY-24-3985; DOE/OR/23177-7381; PHY-2013791; TRN: US2410486

Journal Information:: Physical Review. D., Vol. 109, Issue 7; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Extracting transition generalized parton distributions from hard exclusive pion-nucleon scattering

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