<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Theory Center Seminar<div><span style="background-color: rgb(255, 255, 255);">Monday, July 17</span><div>1:00pm<br>CEBAF Center, Room L102<br><font color="#0f61c8"><br></font><b>A. Radyushkin (in collaboration with K.Orginos, J. Karpie and S. Zafeiropoulos)</b><br><b>Lattice exploration of pseudo-PDFs</b><br><font color="#0f61c8"><br></font>We demonstrate a new method of extracting parton distributions <br>from lattice calculations, based on concepts of pseudo-PDFs and <br>Ioffe-time distributions (ITD). Our lattice calculation shows <br>a linear component in the exponential z_3-dependence <br>in the rest-frame ITD expected from the Z(z_3) factor <br>generated by the gauge link. We also observe that this <br>factor disappears in the ratio of ITDs taken at different Ioffe times \nu=Pz_3. <br>When plotted as a function of the Ioffe time and z_3, the data <br>are very close to z_3-independent functions which allows us to <br>extract PDFs. Our curve for u_v(x)-d_v(x) is rather close<br>to experimental global fits. For small z_3, we observe perturbative <br>DGLAP evolution of pseudo-PDFs, with \alpha_s/\pi =0.1.</div></div></body></html>