Speaker
Description
We present a one-loop perturbative study of unpolarized twist-two generalized parton distributions (GPDs) of quarks for external on-shell gluon states. A finite quark mass m is kept throughout the calculation and serves as an infrared regulator, allowing us to study the collinear limit of the GPDs. We also analyze this limit using dimensional regularization to regulate infrared divergences, and we discuss the implications of our results for the box diagram in deeply-virtual Compton scattering. Furthermore, by taking the second Mellin moment of the GPDs, we extract the associated form factors of the energy-momentum tensor (EMT) in both QED and QCD, with a special focus on the trace of the EMT. Particular attention is also given to potential anomaly-related pole contributions. This analysis complements our previous work on polarized twist-two GPDs and the axial anomaly.