[Jlab-seminars] Theory Center Seminar

[Mary Fox]

*THEORY CENTER SEMINAR*
Monday, July 17, 2017
1:00 p.m. (coffee at 12:45 p.m.)
CEBAF Center. Room L113*


Lattice Exploration of Pseudo-PDFs*
A. Radyushkin, ODU (in collaboration with K. Orginos,
J. Karpie and S. Zafeiropoulos)

We demonstrate a new method of extracting parton distributions from 
lattice calculations, based on concepts
of pseudo-PDFs and Ioffe-time distributions (ITD). Our lattice 
calculation shows a linear component in the
exponential z_3-dependence in the rest-frame ITD expected from the 
Z(z_3) factor generated by the gauge link.
We also observe that this factor disappears in the ratio of ITDs taken 
at different Ioffe times \nu=Pz_3. When
plotted as a function of the Ioffe time and z_3, the data are very close 
to z_3-independent functions which allows
us to extract PDFs. Our curve for u_v(x)-d_v(x) is rather close to 
experimental global fits. For small z_3, we observe
perturbative DGLAP evolution of pseudo-PDFs, with \alpha_s/\pi =0.1.
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