High Energy Physics Seminar

Exotic hadrons are enigmatic particles that cannot be explained as mesons made of a quark-antiquark pair or baryons made of three quarks. Most of those that have been observed are hidden-heavy hadrons containing a heavy quark-antiquark pair. They are typically found near the threshold for the production of two heavy hadrons. The nature of the exotic hadrons has remained unexplained for the last 20 years, an embarrassment for the theoretical high energy physics community. In this seminar, I illustrate a relatively simple solution to the exotic hadron puzzle that is firmly based on QCD using the Born-Oppenheimer approximation. In this approximation, exotic hidden-heavy hadrons are bound states and resonances in potentials that are repulsive at short range, cross a hadron-pair threshold, and approach the threshold from below. This explains the proximity of the exotic hadrons to hadron-pair thresholds and identifies the fine tunings of QCD that are responsible for the remarkable properties of some exotic hadrons. I will also discuss implications for the gluino-hadron spectrum in models with a long-lived gluino.

The talk is in 469 Lauritsen.

Contact [email protected] for Zoom link.