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<b><span style="font-size:28.0pt; font-family:"Times New Roman",serif">Virtual Physics Division Lunch
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<b><span style="font-size:28.0pt; font-family:"Times New Roman",serif">Seminar<o:p> </o:p></span></b></p>
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<span class="value"><b><span style="font-size:28.0pt; font-family:"Times New Roman",serif">Holly Szumila-Vance<o:p> </o:p></span></b></span></p>
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<span class="value"><b><span style="font-size:28.0pt; font-family:"Times New Roman",serif">Jefferson Lab</span></b></span><b><span style="font-size:28.0pt; font-family:"Times New Roman",serif; mso-fareast-font-family:"Times New Roman""><o:p> </o:p></span></b></p>
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<i><span style="font-size:20.0pt">Ruling out Color Transparency in quasi-elastic 12C(e,e’p) up to Q<sup>2</sup> = 14 (GeV/c)<sup>2</sup><o:p> </o:p></span></i></p>
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<b><span style="font-size:18.0pt;mso-fareast-font-family:"Times New Roman"">Abstract:</span></b><o:p> </o:p></p>
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Color transparency (CT) is a fundamental phenomenon of QCD postulating that at high momentum transfer, one can preferentially measure hadrons that fluctuate to a small color neutral transverse size in the nucleus, and final state interactions within the nuclear
medium are suppressed. This talk will discuss the recent quasi-elastic 12C(e, e’p) scattering measurement in Hall C at momentum transfer squared Q<sup>2</sup> = 8, 9.4,11.4, and 14.2 (GeV/c)<sup>2</sup>, the highest ever achieved to date. Nuclear transparency
for this reaction was extracted by comparing the measured yield to that expected from a plane-wave impulse approximation calculation without any final state interactions. The measured transparency was observed to be independent of Q<sup>2</sup>, up to momentum
scales where earlier A(p, 2p) results had indicated a rise in transparency, ruling out the quantum chromodynamics effect of color transparency at such momentum scales. These new results impose strict constraints on models of color transparency for protons.<o:p> </o:p></p>
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<b><span style="font-size:18.0pt; font-family:"Times New Roman",serif"><o:p> </o:p></span></b></p>
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<b><span style="font-size:18.0pt; font-family:"Times New Roman",serif">Friday, October 9, 2020<o:p> </o:p></span></b></p>
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<b><span style="font-size:18.0pt; font-family:"Times New Roman",serif">12:00pm<o:p> </o:p></span></b></p>
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<span style="font-size:18.0pt"><a href="https://bluejeans.com/245615984" target="_blank">https://bluejeans.com/245615984</a><o:p> </o:p></span></p>
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<b>Upcoming Seminars:<o:p> </o:p></b></p>
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<b>Friday, Nov. 13: Camillo Mariani (VT) Argon (e,e’p) Results<o:p> </o:p></b></p>
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<b><i>Stephanie Tysor</i></b></div>
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Physics Division<br>
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Jefferson Lab</div>
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