Speaker
Description
Compton scattering of hadrons in the low-to-intermediate energy range provides a window into the transition between perturbative and non-perturbative QCD. However, the standard perturbative and effective theory techniques struggle to describe this energy region, making first-principles lattice calculations all the more valuable.
The CSSM/QCDSF collaboration has performed numerous calculations of the Compton amplitude using the lattice Feynman-Hellmann method. Despite the success of this approach, low-energy results remain difficult to obtain due to Feynman-Hellmann-specific contaminations.
Focusing on the structure functions $g_1$ and $F_3$, I present a method to control these low-energy contaminations and discuss physical information, such as the effective strong coupling, that can be accessed with this approach.