Generalized Parton Distributions of the Photon with Helicity Flip
Asmita Mukherjee, Sreeraj Nair, Vikash Kumar Ojha
TL;DR
This paper calculates the generalized parton distributions of the photon with helicity flip using light-front wave functions, revealing the role of orbital angular momentum and expressing results in impact parameter space.
Contribution
It provides the first calculation of photon GPDs with helicity flip at leading order, highlighting the orbital angular momentum contributions.
Findings
Photon GPDs with helicity flip are computed at leading order.
Orbital angular momentum of two units is involved in the GPDs.
Results are expressed in impact parameter space.
Abstract
We present a calculation of the generalized parton distributions (GPDs) of the photon when the helicity of the initial photon is different from the final photon. We calculate the GPDs using overlaps of photon light-front wave functions (LFWFs) at leading order in electromagnetic coupling and zeroth order in the strong coupling , when the momentum transfer is purely in the transverse direction. These involve a contribution of orbital angular momentum of two units in the LFWFs. We express these GPDs in the impact parameter space.
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