[Theory-seminars] Theory Seminar Monday (Hybrid) - Stella Schindler

[Colin Egerer]

Hello All,

This coming Monday, October 3rd at 1:00 PM (EDT), Stella Schindler will give our next hybrid theory seminar of the Fall term.
If you will be on-site and are comfortable doing so, please join us in room F224/225 of CEBAF Center. Otherwise, Stella's seminar will also be provided virtually on our usual ZoomGov link: https://jlab-org.zoomgov.com/j/1611179843?pwd=M09CNTFpbFVZSW1IQlhIMGp3RUVHUT09

Please see below for the title and abstract of Stella's talk.

Theory Seminar
Monday, October 3rd at 1:00 PM

Stella Schindler (MIT)
will discuss "Enabling lattice calculation of TMDs via factorization"

Abstract: Transverse momentum distributions (TMDs) encode the three-dimensional momentum structure of quarks and gluons inside hadrons. Global fits to experimental data exhibit large uncertainties for non-perturbative parton momenta, a kinematic region where lattice QCD is typically well-positioned to provide complementary information. Unfortunately, TMD dynamics are dominated by the lightcone, which induces a so-called sign problem, an obstacle to numerics that is NP-hard in the general case. To circumvent this issue, lattice theorists typically project Wilson lines appearing in TMD matrix elements from a lightcone path onto an equal-time slice. We derive a factorization formula connecting the resulting lattice-calculable equal-time distributions (“quasi-TMDs”) to the TMDs that appear in cross-sections (Collins scheme). This formula holds at leading power to all orders in α_s, for all spins and parton flavors. This rigorously connects lattice calculations and physical TMDs for the first time, and opens the path towards computing gluon TMDs.

Have a pleasant weekend!
Caroline, Colin & Patrick
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