f0(1370)

TL;DR

The paper provides multiple experimental evidences from different reactions confirming the existence of the f0(1370) meson, including its mass, width, and decay modes, establishing its status as a genuine resonance.

Contribution

It compiles and analyzes diverse experimental data to conclusively demonstrate the existence and properties of the f0(1370) meson, resolving previous ambiguities.

Findings

f0(1370) peak observed with high significance in multiple experiments

Mass and width of f0(1370) determined consistently across data sets

Resonant phase variation confirms the resonant nature of f0(1370)

Abstract

A summary is given of the main sets of data requiring the existence of f0(1370). Crystal Barrel data on pbar-p -> eta eta pizero contain a visible f0(1370) peak and require at least a 19 standard deviation contribution. This alone is sufficient to demonstrate its existence. More extensive data on pbar-p -> 3pizero at rest contain delicate interferences which determine the mass and width independently in 1S_0 and 3P_1 annihilation and agree within 5 MeV for both mass and width. The peak in 2pi is at 1282 +- 5 MeV, but the rapid increase in 4pi phase space with mass displaces the 4pi peak to 1360 MeV. BES II data for J/Psi -> phi-pi-\pi contain a visible f0(1370) -> 2pi signal >8 sigma. In all cases, a resonant phase variation is required.