Physics Events: Seminars

Virtual Physics Division Lunch Seminar

Subject: The Hexa-Diquark and Novel QCD Effects in Nuclei
Speaker:    Stan Brodsky
Stanford Linear Accelerator Center
Date: Friday, June 5, 2020
Time: 12:00 p.m.

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.

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.  

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.


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