Exclusive production of a pair of high transverse momentum photons in pion-nucleon collisions for extracting generalized parton distributions

Abstract

We show that exclusive production of a pair of high transverse momentum photons in pion-nucleon collisions can be systematically studied in QCD factorization approach if the photon's transverse momentum $q_T$ with respect to the colliding pion is much greater than ${\Lambda }_{\mathrm{QCD}}$. We demonstrate that the leading power non-perturbative contributions to the scattering amplitudes of this exclusive process are process-independent and can be systematically factorized into universal pion's distribution amplitudes (DAs) and nucleon's generalized parton distributions (GPDs), which are convoluted with corresponding infrared safe and perturbatively calculable short-distance hard parts. The correction to this factorized expression is suppressed by powers of $1/q_T$. We demonstrate quantitatively that this new type of exclusive processes is not only complementary to existing processes for extracting GPDs, but also capable of providing an enhanced sensitivity to the dependence of both DAs and GPDs on the active parton's momentum fraction $x$. We also introduce additional, but the same type of exclusive observables to enhance our capability to explore GPDs, in particular, their $x$-dependence.

60 pages, 28 figures; extended reference and some discussions, with the main results unchanged

References in corpus (9)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Science Requirements and Detector Concepts for the Electron-Ion Collider: EIC Yellow Report
• The deconvolution problem of deeply virtual Compton scattering
• Electroproduction of a large invariant mass photon pair
• Factorization in exclusive quarkonium production
• Collinear factorization of diphoton photoproduction at next to leading order
• Extension of the J-PARC Hadron Experimental Facility: Third White Paper
• A new approach to semi-inclusive deep-inelastic scattering with QED and QCD factorization

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