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<b><span style="color:black; font-size:28pt; font-family:Times New Roman,serif">Virtual Physics Division Lunch
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<b><span style="color:black; font-size:28pt; font-family:Times New Roman,serif">Seminar</span></b></p>
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<b><span style="color:black; font-size:28pt; font-family:Times New Roman,serif">Stan Brodsky</span></b></p>
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<b><span style="color:black; font-size:26pt; font-family:Times New Roman,serif">Stanford Linear Accelerator Center</span></b></p>
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<i><span style="color:black; font-size:20pt; font-family:Times New Roman,serif">The Hexa-Diquark and Novel QCD Effects in Nuclei</span></i></p>
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<p style="text-align:center" align="center"><b><span style="color:black; font-size:18pt; font-family:Times New Roman,serif">Abstract:</span></b></p>
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<p><span style="color:black; font-size:12pt; font-family:Times New Roman,serif">Diquarks such as the scalar ud diquark plays a key role in baryon spectroscopy. For example, in the holographic approach to QCD, the proton is a bound state of a u quark and the
ud diquark. The eigensolutions of the holographic approach provide a unified Regge spectroscopy of mesons, baryons, and tetraquarks with a universal Regge slope.</span></p>
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<p><span style="color:black; font-size:12pt; font-family:Times New Roman,serif">The hexa-diquark state is a charge-2, spin-0, baryon number-4, isospin-0, color-singlet state created from six strongly bound scalar ud diquarks. It has the same quantum numbers
as the alpha particle, the He-4 nucleus. The existence of the hexa-diquark could be relevant to a number of novel QCD effects in nuclei such as the strong binding of He-4, the origin of isophobic short-range correlations, the EMC effect, and it predicts new
channels which can be produced by the diffractive dissociation of nuclei. </span></p>
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<p><span style="color:black; font-size:12pt; font-family:Times New Roman,serif"> I will also review other novel QCD effects in nuclei, such as color transparency, hidden color, intrinsic nonperturbative heavy quark phenomena, flavor-dependent antishadowing,
and the breakdown of sum rules for the structure functions of nuclei.</span></p>
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<b><span style="color:black; font-size:18pt; font-family:Times New Roman,serif">Friday, June 5, 2020</span></b></p>
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<b><span style="color:black; font-size:18pt; font-family:Times New Roman,serif">12:00pm</span></b></p>
<p style="text-align:center" align="center"><span style="color:black; font-size:12pt; font-family:Times New Roman,serif"><a href="https://bluejeans.com/245615984" target="_blank" rel="noopener noreferrer"><span style="font-size:18pt">https://bluejeans.com/245615984</span></a></span></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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