Speaker
Description
A priori, nothing prohibits the existence of exotic hadrons in QCD. However, for the particular case of elusive pentaquarks, more than fifty years of experimental research ended up being inconclusive, leaving the scientific community wondering if they really exist. The LHCb Collaboration announcement on the two new pentaquark states with heavy quark content in 2015 revived the interest in the pentaquark search that waned for a moment after the previous claims at the turn of the millennium turned out to be spurious. Four years after the initial discovery announcement, the LHCb collaboration released new results confirming their previous observation while resolving the previously observed pentaquark state into a double-peak structure and discovering another resonant structure at a lower invariant mass. Today, the true nature of the LHCb’s hidden charm pentaquarks is still unknown and the observation hasn’t been verified in an independent experiment. My talk will focus on the Jefferson Lab experiments that measured the J/ψ photo-production cross section near threshold region to search for these LHCb hidden-charm pentaquark states.
