Meson Spectroscopy and the Search for Exotics

TL;DR

This paper reviews the current evidence for exotic hadrons in the meson sector, including scalar and tensor glueballs, and discusses the prospects for hybrid mesons with exotic quantum numbers.

Contribution

It provides a comprehensive overview of experimental and theoretical progress in identifying and understanding exotic mesons and glueballs.

Findings

Strong evidence for a scalar glueball mixed with scalar mesons

Candidate for tensor glueball identified

Discussion of hybrid mesons with exotic quantum numbers

Abstract

I will review the current status of exotic hadrons in the meson sector. There is currently strong evidence that a scalar glueball mixed into the normal scalar mesons has been found. There is also an interesting candidate for the tensor glueball state. Finally, I will discuss hybrid mesons with explicitly exotic quantum numbers.