Understanding photon TMDs with light-front wave function
Submitted to HP 2024 Proceeding
S. Puhan, N. Kaur, and H. Dahiya
HP 2024
November 20, 2024
Abstract
In this work, we try to understand the transverse structure of photon through transverse momentum dependent parton distribution functions (TMDs) in quantum chromodynamics. We calculate all the possible time reversal photon TMDs using light-front wave functions. For this work, we have considered photon as a Fock-state of quark anti-quark pair. All the 9 T-even TMDs have been presented in the overlap and explicit form of light-front wave functions using the helicity amplitudes. We observe that only 3 TMDs are non-zero for the case of a real photon as compared to 8 for virtual photon. We briefly discuss the unpolarized f_1(x, k_perp), longitudinally polarized g_1L(x, k_perp^2), transversely polarized h_1(x, k_perp^2) and tensor polarized f_1LL(x, k_perp^2) TMDs for both real and virtual photon.
Summary
Presents all 9 T-even photon TMDs using light-front wave functions for a quark-antiquark Fock state. Finds only 3 TMDs are nonzero for real photons vs. 8 for virtual photons. Discusses unpolarized, longitudinal, transverse, and tensor-polarized TMDs.
Authors: S. Puhan, N. Kaur, and H. Dahiya
Published in: HP 2024

