Dr. Abhishek Mohapatra
Technical University of Munich
Born-Oppenheimer Effective Theory: A Unified Approach to exotic XYZ hadrons
Location: 4138 Physics Research
Abstract: The discovery of XYZ exotic states in the hadronic sector, particularly those containing two heavy quarks, remains one of the most intriguing open problems in particle physics. In this talk, I present the Born-Oppenheimer Effective Field Theory (BOEFT), a framework derived from QCD, capable of describing exotic hadrons of any composition. I discuss the general Schrödinger coupled equations governing arbitrary angular momentum of light degrees of freedom, capturing the dynamics of hybrids, tetraquarks, pentaquarks, doubly heavy baryons, and quarkonia at leading order—including nonadiabatic effects. I also explore the predicted multiplet structures, selection rules, and key nonperturbative gauge-invariant correlators—such as static energies, generalized Wilson loops, gluelumps, and adjoint mesons—which serve as essential lattice QCD inputs for BOEFT. Moreover, I show for the first time new results on the behavior of static energies at short distances and mixing with the threshold at long distances based on BOEFT. As an application, I show results for the hybrid spectrum, hybrid decays to quarkonium, results for X(3872) and T_cc (3875), and preliminary results on pentaquark states.
