[Theory-seminars] Theory seminar Tomorrow (Mon. Jan 30th, L102) - Anatoly Radyushkin

[Raul Briceno]

Dear all, 
This is just a reminder of tomorrow’s talk. 
Raul

> On Jan 26, 2017, at 3:37 PM, Raul Briceno <rbriceno at jlab.org> wrote:
> 
> Theory Center Seminar
> Monday, Jan 30th, 2017
> 1:00 p.m.
> Room L102
> 
> Anatoly Radyushkin (ODU/JLab)
> Title: Nonperturbative Evolution of Parton Quasi-Distributions
> 
> Abstract:
> Using the formalism of parton virtuality distribution functions (VDFs) we establish a connection between the transverse momentum dependent distributions (TMDs) and quasi-distributions (PQDs) introduced recently by X. Ji for lattice QCD extraction of parton distributions. We build models for PQDs from the VDF-based models for soft TMDs, and analyze the P_z dependence of the resulting PQDs. We observe a strong nonperturbative evolution of PQDs for small and moderately large values of P_z reflecting the transverse momentum dependence of TMDs. Thus, the study of PQDs on the lattice in the domain of strong nonperturbative effects opens a new perspective for investigation of the 3-dimensional hadron structure. A similar analysis is done for the pion distribution amplitude. As there are many models claimed to describe the primordial shape of the pion DA, we present the $p_3$-evolution patterns for models producing some popular proposals: Chernyak-Zhitnitsky, flat and asymptotic DAs!
> . Our results may be used as a guide for future studies of the pion distribution amplitude on the lattice using the quasi-distribution approach.
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