<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><br class=""></div><div class=""><div class="">Theory Seminar</div><div class="">Monday, July 27, 2015</div><div class="">1:00 p.m.</div><div class="">CEBAF Center, L102</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Title: Nuclear PDFs and Electroweak Boson production in Heavy Nuclei</div><div class="">Speaker D.B. Clark (SMU)</div><div class=""><br class=""></div><div class="">abstract:</div><div class=""><br class=""></div><div class="">Drell-Yan W/Z electroweak boson production at the LHC is an essential standard candle which is used for calibration of beam luminosity and detector properties. In addition to proton-proton collisions, the LHC has measured heavy nuclei lead-lead and proton-lead W/Z production. Comparison of these data sets can provide discriminating information of the nuclear modifications present in the Parton Distribution Functions (PDFs).</div><div class=""><br class=""></div><div class="">The nCTEQ collaboration has recently released the nCTEQ15 set of nuclear PDFs (nPDFs) with Hessian error estimation sets for various values of A. These new nPDFs will be presented along with an analysis of W/Z production in lead-lead and proton-lead collisions at the LHC. Cross-sections are calculated at NLO with the FEWZ program at 2.76 and 5.02 TeV. We identify observables where the nuclear modifications are larger than the predicted uncertainty, and we compare these calculations to recent CMS measurements. </div></div><br class=""><br class=""><div apple-content-edited="true" class="">
<div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><div class="">- - - - -</div><div class="">Dr. César Fernández-Ramírez</div><div class=""><br class=""></div><div class="">Jefferson Lab Theory Center</div><div class="">12000 Jefferson Ave., Newport News, VA 23606, USA</div><div class=""><br class=""></div><div class="">Phone: (+1) 757-269-7844</div><div class="">Fax: (+1) 757-269-7002</div><div class="">E-mail: <a href="mailto:cesar@jlab.org" class="">cesar@jlab.org</a></div></div><div style="color: rgb(0, 0, 0); letter-spacing: normal; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><br class=""></div></div></div><br class="Apple-interchange-newline"></div><br class="Apple-interchange-newline"><br class="Apple-interchange-newline">
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