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<b><span style="font-size:48.0pt">Physics Seminar<o:p></o:p></span></b></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span class="value"><b><span style="font-size:22.0pt">Axel Schmidt</span></b></span><span class="value"><span style="font-size:22.0pt"><o:p></o:p></span></span></p>
<p class="MsoNormal" align="center" style="text-align:center"><span class="value"><b><span style="font-size:22.0pt">Massachusetts Institute of Technology
</span></b></span><o:p></o:p></p>
<p class="MsoNormal"><b><i><span style="font-size:12.0pt"><o:p> </o:p></span></i></b></p>
<p class="MsoNormal" align="center" style="text-align:center"><i><span style="font-size:22.0pt">The SRC-EMC Connection</span></i><i><span style="font-size:22.0pt"><o:p></o:p></span></i></p>
<p class="MsoNormal" align="center" style="text-align:center"><i><span style="font-size:22.0pt"><o:p> </o:p></span></i></p>
<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size:18.0pt">Abstract:</span></b><br>
<br>
<br>
The EMC Effect, the observation that quark momentum distributions in nuclei are substantially different from those of free protons and neutrons, has eluded a definitive explanation for over 35 years and remains one of the large open questions in nuclear physics.
The fact that quarks and gluons, with GeV-scale dynamics, are affected by the MeV-scale nuclear environment, may point the way to learning something profound about nuclei, or even confinement itself. While several explanations for the EMC Effect have been
ruled out by experiment, two broad classes of explanations remain. In one, the EMC Effect comes about from the attractive mean-field, leading to a modest modification to the structure of all nucleons. In the other, the SRC-EMC hypothesis, most nucleons are
un-modified, but those in short-range correlated (SRC) pairs change their structure dramatically.<br>
<br>
In a recent paper, I and my collaborators presented new data from CLAS and developed a phenomenological model that lends strong support to the SRC-EMC hypothesis. Our analysis is the first simultaneous extraction of the EMC effect and the SRC pair density in
carbon, aluminum, iron, and lead. Our model shows that the universal modification of only SRC nucleons can explain the world EMC Effect data, and has numerous applications, such as the extraction of the free neutron structure function.<br>
<br>
The SRC-EMC hypothesis will be tested experimentally using a technique called ``Recoil-tagged deep inelastic scattering." The current BAND experiment (Hall B) and upcoming LAD experiment (Hall C) will make a definitive statement about the role SRC pairs play
in the EMC Effect.<b><span style="font-size:18.0pt"><o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size:18.0pt">Friday, April 5, 2019<o:p></o:p></span></b></p>
<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size:18.0pt">11:00am<o:p></o:p></span></b></p>
<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size:18.0pt">CEBAF Center Auditorium<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Stephanie Tysor<o:p></o:p></p>
<p class="MsoNormal">Thomas Jefferson National Accelerator Facility<o:p></o:p></p>
<p class="MsoNormal">Physics Division<o:p></o:p></p>
<p class="MsoNormal">Hall A Administrative Assistant<br>
(office)<a href="callto:757-269-6005"><span style="color:blue">757-269-6005</span></a> (fax)<a href="callto:757-269-5235"><span style="color:blue">757-269-5235</span></a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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