$\chi_{c1}(2p)$: an overshadowed charmoniumlike resonance

TL;DR

This paper investigates the influence of the $ ext{X}(3872)$ resonance on the detection of a higher charmoniumlike state, revealing that the former can overshadow the latter in certain decay channels, complicating experimental identification.

Contribution

It provides a detailed analysis of meson-meson interactions from lattice QCD, showing how the $ ext{X}(3872)$ can obscure the detection of a nearby higher resonance.

Findings

$ ext{X}(3872)$ can overshadow higher resonances in certain channels.

The higher resonance may have been observed via $ ext{ω}J/ψ$ decay.

Detection of the higher resonance is challenging due to $ ext{X}(3872)$'s influence.

Abstract

A thorough study of the $J^{PC}=1^{++}$ elastic $D^{0}\bar{D}^{\ast0}$ and $D^{+}D^{\ast-}$ 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 $\chi_{c1}(3872)$, which can be naturally assigned to either a bound or virtual charmoniumlike state close below the $D^{0}\bar{D}^{\ast0}$ threshold, can overshadow a quasiconventional charmoniumlike resonance lying above threshold. This makes difficult the experimental detection of this resonance through the $D^{0}\bar{D}^{\ast0}$ and $D^{+}D^{\ast-}$ 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 $\omega J/\psi$.