Conventional mesons below 2 GeV

TL;DR

This paper reviews the current understanding of conventional quark-antiquark mesons below 2 GeV, highlighting open questions about specific meson states and their implications for chiral symmetry and anomalies.

Contribution

It provides a concise overview of the meson spectrum below 2 GeV and discusses unresolved issues related to meson classifications and chiral symmetry.

Findings

Uncertain status of the strange-antistrange orbitally excited vector meson.

Open questions about the nonet of axial-tensor mesons.

Potential link between isoscalar mixing angle and chiral anomaly.

Abstract

We briefly review the status of various conventional quark-antiquark mesons below 2 GeV and outline some open questions: the status of the strange-antistrange orbitally excited vector meson, the status of the nonet of axial-tensor mesons (chiral partners of the well known tensor mesons), and the isoscalar mixing angle in the pseudotensor sector, which can eventually represent a novel manifestation of the chiral anomaly.