χc1(2p): an overshadowed charmoniumlike resonance

Abstract

A thorough study of the JPC = 1++ elastic {D}^0{overline{D}}^{ast 0} and D+D∗− scattering, where the form of the meson-meson interaction is inferred from lattice QCD calculations of string breaking, is carried out for center-of-mass energies up to 4 GeV. We show that the presence of χc1(3872), which can be naturally assigned to either a bound or virtual charmoniumlike state close below the {D}^0{overline{D}}^{ast 0} threshold, can overshadow a quasiconventional charmoniumlike resonance lying above threshold. This makes difficult the experimental detection of this resonance through the {D}^0{overline{D}}^{ast 0} and D+D∗− channels, despite being its expected main decay modes. We analyze alternative strong and electromagnetic decay modes. Comparison with existing data shows that this resonance may have already been observed through its decay to ωJ/ψ.