Pseudovector meson with strangeness and closed-charm

TL;DR

This study uses lattice QCD to explore the mass spectrum of exotic 1^{+} mesons with specific quark content, identifying a resonance around 4010 MeV with novel operator techniques.

Contribution

It introduces molecular and diquark-antidiquark operators in lattice QCD to study exotic mesons with strangeness and charm, revealing a resonance at 4010 MeV.

Findings

Detection of a 1^{+} resonance at ~4010 MeV

Use of novel operators in quenched lattice QCD

Resonance persists as light quark mass approaches physical values

Abstract

We investigate the mass spectrum of 1^{+} exotic mesons with quark content (\c\s\cbar\qbar) or (\c\q\cbar\sbar), using molecular and diquark-antidiquark operators, in quenched lattice QCD with exact chiral symmetry. For the molecular operator {(\qbar\gamma_i\c)(\cbar\gamma_5\s)-(\cbar\gamma_i\s)(\qbar\gamma_5\c)} and the diquark-antidiquark operator {(\q^T C \gamma_i \c)(\sbar C \gamma_5 \cbar^T)- (\q^T C \gamma_5 \c)(\sbar C \gamma_i^T \cbar^T)}, both detect a 1^{+} resonance with mass around 4010 +- 50 MeV in the limit m_q -> m_{u,d}.