The spectrum of charmonium-like vector mesons in lattice QCD

TL;DR

This paper presents the first lattice QCD calculations of exotic vector meson spectra, identifying states like X(3872) and Y(4260), and predicting heavier exotic mesons with various quark compositions.

Contribution

It provides the first lattice QCD results for the spectrum of exotic vector mesons using molecular and diquark-antidiquark operators with exact chiral symmetry.

Findings

X(3872) and Y(4260) are in the QCD spectrum with specific quantum numbers.

First theoretical predictions of heavier exotic mesons with various quark configurations.

Lattice results support the existence of these exotic states in QCD.

Abstract

We present the first lattice results of the spectrum of exotic vector mesons extracted from the molecular and diquark-antidiquark operators, with quark fields c-q-cbar-qbar, and c-s-cbar-qbar (c-q-cbar-sbar) respectively, in lattice QCD with exact chiral symmetry. Our results suggest that X(3872) and Y(4260) are in the spectrum of QCD, with J^{PC} = 1^{++} and 1^{--} respectively. Moreover, we obtain the spectrum of heavier exotic mesons with c-s-cbar-ubar (c-u-cbar-sbar), c-s-cbar-dbar (c-d-cbar-sbar), c-s-cbar-sbar, and c-c-cbar-cbar, as the first theoretical predictions from lattice QCD.