Theory Seminar - Marston Copeland

On Monday, May 13, at 1 p.m., Marston Copeland of Duke University will present "Transverse Momentum Dependent PDFs in Chiral Effective Theory" in CEBAF Center rm. L102 and via Zoom.

We kindly ask all attendees to provide their full name when entering the event. If attendees have questions for the speaker, please introduce yourself before asking the question.

Abstract: I present a theoretical framework to match transverse momentum dependent parton distribution functions (TMD PDFs) onto chiral perturbation theory operators. In this framework, the TMD PDF is expressed as a convolution of TMD hadronic splitting functions, which describe fluctuations into intermediate hadrons in chiral perturbation theory and short-distance matching coefficients, which are the TMD PDFs of intermediate hadrons in the chiral limit. I explore the various limits of the matching condition and apply an operator-product expansion to the high-energy matching coefficients, allowing them to be written in terms of the collinear valence PDFs of intermediate hadrons. As an example, I calculate the isovector TMD hadronic splitting functions for the nucleon at leading order in the chiral expansion. Finally, I present numerical results and discuss phenomenological implications.

Zoom link.