On chiral excitations with exotic quantum numbers

TL;DR

This paper predicts the existence of exotic chiral meson resonances with specific quantum numbers, analyzing their properties and potential experimental signals in high-energy physics experiments.

Contribution

It provides a detailed analysis of the flavor sextet of charmed meson resonances with J^P=1^+ using chiral Lagrangian and lattice QCD data, including pole mass calculations.

Findings

Pole masses in the complex energy plane are derived.

Rapid phase shift variation predicted between eta D* and K* thresholds.

Potential experimental signals identified in phase shifts and invariant mass distributions.

Abstract

We consider the flavour sextet of charmed meson resonances with J^P= 1^+ quantum numbers that is predicted by the leading order chiral Lagrangian with up, down and strange quarks. The effect of chiral correction terms as determined previously from QCD lattice data is worked out. Pole masses in the complex energy plane are derived. The most promising signal from such states accessible in experiments like Belle, LHCb and PANDA are foreseen in the s-wave pi D* phase shift and the eta D* invariant mass distribution. For physical quark masses a rapid variation of the phase shift in between the eta D* and the bar K Ds* thresholds is predicted.