Threshold Structures in Hadron Spectrum and Hadronic Molecules
Numerous candidates for exotic hadrons have been detected experimentally in the past two decades,pre-dominantly near the threshold of a pair of hadrons.This study aims to investigate the overall behavior of near-threshold line shapes in invariant mass distributions.It is noteworthy that the threshold cusp might manifest as a peak only in channels with attractive interaction.The assertion is made that there should be near-threshold structures for any heavy-quark and heavy-antiquark hadron pairs exhibiting attractive interaction at the threshold,as observed in the invariant mass distribution of heavy quarkonium and light hadrons that couple to the open-flavor hadron pair.Furthermore,we have conducted an analysis of potential hadronic molecules comprising pairs of heavy hadrons,util-izing the Bethe-Salpeter equation with constant interactions derived from the one-boson-exchange model.Observed candidates for these hadronic molecules are in good agreement with our predicted spectrum.
threshold structurehadronic moleculesheavy-antiheavy systemsheavy-heavy systems
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