Speaker
Description
The discovery of the exotic heavy tetraquark state X(3872) by the Belle Collaboration and hidden charm pentaquarks ($P_{c\bar{c}}$) by the LHCb Collaboration marked a breakthrough in exotic hadron physics. Following these observations, numerous exotic hadrons have been found. Understanding their production mechanisms and internal multiquark structures will illuminate the fundamental origin of matter. Theoretically, these exotic states can be interpreted as either hadronic molecular states of genuine multiquark states, or even hybrid states containing gluons. In this talk, we will present a series of recent works on the production mechanisms of hidden charm pentaquarks with multiple strangeness $S=0,-1,-2,-3$, based on the fully off-mass-shell coupled channel formalism. The coupled-channel effects play an essential role in forming hadronic molecular states with charm mesons and single charmed baryons in $S$-wave. We also predict possible genuine pentaquark states with positive parity. We propose a plausible explanation of the reason for the null results of finding $P_{c\bar{c}}$'s from $J/\psi$ photoproduction by the GlueX experiment.
