Abstract
Exotic hadrons reported in the heavy flavor sector have attracted much interest in hadron and nuclear physics. Especially near the thresholds, the hadron-hadron interaction is important to understand these exotic structures. In this talk, the short range πJ/ψ − DD̅* potential whose importance is indicated by the Lattice QCD is studied by the D(*) meson exchange model, and the Born-order quark exchange model. We find the large difference between the results of the D(*) meson exchange and the quark exchange calculations.
Highlights
Exotic hadrons reported in the heavy flavor sector have been one of the interesting topics in hadron and nuclear physics. In the experiments, such as BaBar, Belle, BESIII, and LHCb, unexpected mesons called XYZ states have been reported, whose mass spectra have not been explained by the standard constituent quark picture being qqq as a baryon and qqas a meson [1, 2]
HALQCD collaboration performed Lattice QCD simulation for the coupledchannel system including πJ/ψ − ρηc − DD ∗ corresponding to Zc(3900) at the non physical pion mass mπ = 410 − 700 MeV [15]. This simulation indicates that Zc(3900) is a virtual state, and it is induced by the strong πJ/ψ − DD ∗ potential
In the quark exchange model, the πJ/ψ − DD ∗ interaction is given by the Born-order quark exchange diagram [16, 17]
Summary
Exotic hadrons reported in the heavy flavor sector have been one of the interesting topics in hadron and nuclear physics. HALQCD collaboration performed Lattice QCD simulation for the coupledchannel system including πJ/ψ − ρηc − DD ∗ corresponding to Zc(3900) at the non physical pion mass mπ = 410 − 700 MeV [15] This simulation indicates that Zc(3900) is a virtual state, and it is induced by the strong πJ/ψ − DD ∗ potential. It is an interesting result because such charm quark (charmed meson) exchange process is expected to be suppressed due to the large mass of the exchange particle. In the quark exchange model, the πJ/ψ − DD ∗ interaction is given by the Born-order quark exchange diagram [16, 17]
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