Speaker
Description
A new zoo consisting of dozens of heavy subatomic particles that contain more than three quarks and antiquarks have been discovered beginning in 2003. Although they must be described by QCD, the pattern of these exotic heavy hadrons remained unexplained for more than 20 years. I will present a simple proposal for the pattern based on the Born-Oppenheimer approximation for QCD. This pattern could be corroborated by lattice QCD calculations of the spectrum of gluino hadrons (hadrons bound to a color-octet source). The existence of the isospin-0 hidden-charm tetraquark $\chi_{c1}(3872)$ implies that the lowest-energy gluino hadron has isospin 0 and $J^{PC} = 1^{- -}$. The pattern also explains a remarkable property of the isospin-1 hidden-bottom tetraquark $T_{c \bar c}(10650)$.