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<b><span style="font-size:28.0pt; font-family:"Times New Roman",serif">Virtual Physics Division Lunch Seminar</span></b></p>
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<span><b><span style="font-size:28.0pt; font-family:"Times New Roman",serif">Stan Brodsky</span></b></span></p>
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<span><b><span style="font-size:26.0pt; font-family:"Times New Roman",serif">Stanford Linear Accelerator Center</span></b></span><b><span style="font-size:26.0pt; font-family:"Times New Roman",serif; mso-fareast-font-family:"Times New Roman""></span></b></p>
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<i><span style="font-size:20.0pt; font-family:"Times New Roman",serif; mso-fareast-font-family:"Times New Roman"; mso-bidi-font-weight:bold">The Hexa-Diquark and Novel QCD Effects in Nuclei</span></i><i><span style="font-size:20.0pt; font-family:"Times New Roman",serif; mso-bidi-font-weight:bold"></span></i></p>
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<b><span style="font-size:18.0pt;mso-fareast-font-family:"Times New Roman"">Abstract:</span></b></p>
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<span style="color:black">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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<span style="color:black">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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<span style="color:black"> 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="font-size:18.0pt; font-family:"Times New Roman",serif">Friday, June 5, 2020</span></b></p>
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<b><span style="font-size:18.0pt; font-family:"Times New Roman",serif">12:00pm</span></b></p>
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"Times New Roman",serif;color:black"><a href="https://bluejeans.com/245615984" target="_blank">https://bluejeans.com/245615984</a></span><span style="font-size:18.0pt;font-family:"Times New Roman",serif"></span></p>
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<b><i>Stephanie Tysor</i></b></div>
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Physics Division<br>
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