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<div id="x_divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Bernd Surrow <surrow@temple.edu><br>

<b>Sent:</b> Thursday, March 18, 2021 11:46 AM<br>

<b>To:</b> eicug-users@eicug.org <eicug-users@eicug.org><br>

<b>Subject:</b> [eicug-users] CTEQ Webinar on the new SeaQuest results on March 24th</font>

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<div class=""><span class="" style="margin:0px; font-size:12pt">Dear <span class="" style="font-family:Arial; font-size:14.666666984558105px; background-color:rgb(255,255,255)">Colleagues</span>, </span></div>

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<span class="" style="margin:0px; font-size:12pt">We are pleased to announce the first CTEQ Webinar (via Zoom and YouTube Live) with Paul Reimer<span class="" style="font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255)"><span class="x_x_x_Apple-converted-space"> giving</span></span> a </span>

<div class=""><span class="" style="margin:0px; font-size:12pt">colloquium-level talk on the recent SeaQuest results that were published in Nature. Please feel free to forward </span></div>

<div class=""><span class="" style="margin:0px; font-size:12pt">this email to anyone who may be interested.<span class="x_x_x_Apple-converted-space"> </span></span>

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<div class="" style="margin:0px; font-size:12pt">Thank you,<span class="x_x_x_Apple-converted-space"> </span><br class="">

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<div class="" style="margin:0px; font-size:12pt">Pavel and Huey-Wen<span class="x_x_x_Apple-converted-space"> </span><br class="">

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<div class="" style="margin:0px; font-size:12pt">ЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧ<span class="" style="font-size:12pt">ЧЧЧ</span></div>

<div class="" style="margin:0px; font-size:12pt"><span class="" style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt">Date/Time: March 24th 8:30AM CDT/9:30AM EDT</span></div>

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Speaker: Paul Reimer (Argonne National Laboratory)<br class="">

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Title: The asymmetry in the antimatter of the proton</div>

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Abstract:<span class="x_x_x_Apple-converted-space"> </span><br class="">

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For over 40 years we have understood protons as bound states of quarks and gluons interacting through the strong force, </div>

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described by Quantum Chromodynamics (QCD). At large energy scales, perturbative QCD successfully describes the strong </div>

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interaction, yet our understanding of the dynamics that form a physical proton from quarks and gluons is, at best, poor. Both </div>

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experiment and theory fail to explain basic properties including the proton spin, mass, or the flavor composition of the antiquark </div>

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sea. Contrary to naive assumptions, a remarkable asymmetry between the anti-down d and anti-up u quarks has been observed. </div>

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This asymmetry cannot be generated through perturbative QCD and demonstrates that at any energy scale, there is a fundamental </div>

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anti-quark component in the proton. The Drell-Yan reaction is uniquely sensitive to antiquark distributions of the interacting hadrons </div>

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because the reaction requires an anti-quark in one of the initial state hadrons. With the kinematics of the SeaQuest spectrometer, </div>

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it is particularly sensitive to the anti-quarks of the target nuclei. The E906/SeaQuest collaboration has measured the ratio of </div>

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deuterium to hydrogen Drell-Yan cross sections. From these data, we have extracted the ratio of \bar d/\bar u, as a function of the </div>

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fraction of the proton's momentum that is carried by the interacting quark, x<sub class="">Bj</sub>.  These data extend the range of previous measurements </div>

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to larger x<sub class="">Bj</sub>. I will also highlight other continuing analyses future Drell-Yan measurements at Fermilab.</div>

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Zoom Webinar<span class="x_x_x_Apple-converted-space"> </span>Link<span class="x_x_x_Apple-converted-space"> </span><br class="">

<div class="" style="margin:0px"><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__msu.zoom.us_j_98237446129&d=DwMF-g&c=CJqEzB1piLOyyvZjb8YUQw&r=h0ddwZahF7UudlBHJ5C8U0UdF0FQd7mWAANW-z6-AOM&m=AM3q_6PiFUxHqIW7wrfHhqzUOqgiYkIeGH2REbsiRfw&s=s_V_CfiHgipgXz0ISoXx1-0asddKiN06ALqK-jjyH2E&e=" target="_blank" rel="noopener noreferrer" class="" style="margin:0px">https://msu.zoom.us/j/98237446129</a><span class="x_x_x_Apple-converted-space"> </span>(passcode:

 416959)<br class="">

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YouTube Live:</div>

<span class="" style="margin:0px; font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:black"><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__youtu.be_GAdQDhvyI8w&d=DwMF-g&c=CJqEzB1piLOyyvZjb8YUQw&r=h0ddwZahF7UudlBHJ5C8U0UdF0FQd7mWAANW-z6-AOM&m=AM3q_6PiFUxHqIW7wrfHhqzUOqgiYkIeGH2REbsiRfw&s=rnlWxDyXCsCTezTYt8GO9AD-UddBQ5j-xmxvv1WZO50&e=" target="_blank" rel="noopener noreferrer" class="" style="margin:0px">https://youtu.be/GAdQDhvyI8w</a></span></div>

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<span class="" style="font-family:Helvetica">ЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧЧ</span><span class="" style="font-family:Helvetica; font-size:12pt">ЧЧЧ</span></div>

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<font class="" size="2"><span class="" style="font-size:11pt">Prof. Huey-Wen Lin (she/her/hers)<br class="">

Department of Physics and Astronomy & Computational Mathematics, Science and Engineering<br class="">

Michigan State University</span></font></div>

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