An alternative interpretation of Belle data on \gamma-\gamma -> \eta'-\pi^+-\pi^-

TL;DR

This paper reinterprets Belle's gamma-gamma to eta'-pi-pi data by fitting a broad 0^(-+) signal, potentially identifying it as a glueball, and confirms the resonant nature of X(1835).

Contribution

It offers an alternative analysis of experimental data suggesting a possible glueball interpretation of a broad resonance.

Findings

Identification of a broad 0^(-+) signal peaking at 2250-2300 MeV.

Confirmation of the resonant phase variation of X(1835).

Refitting data without the eta(1760) resonance.

Abstract

Belle data on gamma-gamma -> eta'-pi-pi are refitted using a broad J^{PC}=0^(-+) signal peaking in the mass range 2250-2300 MeV, but without \eta (1760). There is the possibility that this broad 0^(-+) signal may be identified with the 0^(-+) glueball predicted originally by Morningstar and Peardon. The X(1835) is confirmed to have a resonant phase variation.