Accessing chiral-even quark generalised parton distributions in the exclusive photoproduction of a $\gamma {\pi }^{\pm }$ pair with large invariant mass in both fixed-target and collider experiments

Abstract

We compute the exclusive photoproduction of a $\gamma {\pi }^{\pm }$ pair using the collinear factorisation framework, in the kinematic regime where the pair has a large invariant mass. This exclusive channel presents a new avenue for the investigation of GPDs. It is particularly interesting as the high centre of mass energies available at future experiments will allow the study of GPDs at small skewness $\xi$. We compute the scattering amplitude of the process, at leading twist and leading order in ${\alpha }_s$, which is used to estimate its cross-section and linear polarisation asymmetries with respect to the incoming photon, for JLab~12-GeV, COMPASS, future EIC and LHC (in ultra-peripheral collisions) kinematics. We find that the order of magnitude of estimates are sufficiently large for a dedicated experimental analysis to be performed, especially at JLab. We also compare the results from an asymptotic distribution amplitude (DA) to those using a recently proposed \textit{holographic} DA.

50 pages, 32 figures

References in corpus (5)

• The Physics of Ultraperipheral Collisions at the LHC
• The nucleon spin and momentum decomposition using lattice QCD simulations
• Single diffractive hard exclusive processes for the study of generalized parton distributions
• Exclusive production of a pair of high transverse momentum photons in pion-nucleon collisions for extracting generalized parton distributions
• Collinear factorization of diphoton photoproduction at next to leading order

Cited by in corpus (11)

• Extraction of the Parton Momentum-Fraction Dependence of Generalized Parton Distributions from Exclusive Photoproduction
• NLO corrections to the deeply virtual meson production revisited: impact on the extraction of generalized parton distributions
• Impact of JLab data on the determination of GPDs at zero skewness and new insights from transition form factors $N\to \Delta$
• Extracting transition generalized parton distributions from hard exclusive pion-nucleon scattering
• Exploring Baryon Resonances with Transition Generalized Parton Distributions: Status and Perspectives
• Exclusive photoproduction of ${\eta }_c\gamma$ pairs with large invariant mass
• Nucleon Structure from Basis Light-Front Quantization : Status and Prospects
• Unified and optimal frame choice for generalized parton distributions
• Photoproduction of ${\eta }_c\gamma$ pairs in CGC framework
• Physics with high-luminosity proton-nucleus collisions at the LHC
• New framework for extracting GPDs from exclusive photon electroproduction