<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1253">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<span style="font-size:12pt;margin:0px;background-color:rgb(255, 255, 255)">Hello All,</span>
<div style="font-size:12pt;margin:0px;background-color:rgb(255, 255, 255)">
<div style="margin:0px"><br>
</div>
<div style="margin:0px">Tomorrow, October 3rd at 1:00 PM (EDT), Stella Schindler will give our next hybrid theory seminar of the Fall term.</div>
<div style="margin:0px">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:<span> </span><a href="https://jlab-org.zoomgov.com/j/1611179843?pwd=M09CNTFpbFVZSW1IQlhIMGp3RUVHUT09" target="_blank" rel="noopener noreferrer" data-auth="NotApplicable" data-linkindex="0" style="margin:0px">https://jlab-org.zoomgov.com/j/1611179843?pwd=M09CNTFpbFVZSW1IQlhIMGp3RUVHUT09</a><br>
</div>
<div class="x__Entity x__EType_OWALinkPreview x__EId_OWALinkPreview x__EReadonly_1" style="margin:0px">
</div>
<br>
<div style="margin:0px">Please see below for the title and abstract of Stella's talk.</div>
<div style="margin:0px"><br>
</div>
<div style="margin:0px"><u><b>Theory Seminar</b></u></div>
<div style="margin:0px">Monday, October 3rd at 1:00 PM</div>
<div style="margin:0px"><br>
</div>
<div style="margin:0px"><u><b>Stella Schindler</b></u><span> </span>(MIT)</div>
<div style="margin:0px">will discuss "Enabling lattice calculation of TMDs via factorization"</div>
<div style="margin:0px"><br>
</div>
<div style="margin:0px"><u><b>Abstract:</b></u><span> </span>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 á_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.</div>
<div style="margin:0px"><br>
See you tomorrow !<br>
</div>
Caroline, Colin & Patrick</div>
<br>
</div>
</body>
</html>