From Diphoton GDAs and Photon GPDs to the chiral odd Photon DA

2009/07/02 by L. Szymanowski, Szymanowski, L.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.0907.0352

openalex publication_date 2009/07/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The photon is a very interesting object for QCD studies since it has both a pointlike coupling to quarks, which yields a perturbative part of photon's wave function, and a non-perturbative coupling related to the magnetic susceptibility of the QCD vacuum and which builds its chiral-odd twist-2 distribution amplitude. The first feature allows us to compute the photon anomalous generalized parton distributions (GPD) and the diphoton generalized distribution amplitudes. The second feature allows us to use a transverse spin asymmetry to probe the chiral odd distribution amplitude of the photon.

Related

• Accessing GPDs through the exclusive photoproduction of a photon-meson pair with a large invariant mass
• On chiral-odd Generalized Parton Distributions
• Accessing Generalized Parton Distributions through 2 → 3 exclusive processes
• Photon interactions and chiral dynamics
• Chiral Odd and Chiral Even Generalized Parton Distributions in Position Space