A partial wave analysis of the centrally produced pi+pi- system in pp interactions at 450 GeV/c

TL;DR

This paper presents a detailed partial wave analysis of the pi+pi- system produced centrally in proton-proton collisions at 450 GeV/c, identifying several meson states and their quantum numbers.

Contribution

It provides the first unambiguous physical solution for the partial wave analysis of this system and reports evidence for multiple meson resonances.

Findings

Evidence for f0(980), f0(1300), f0(1500), and fJ(1710) with J=0 in the S-wave.

Observation of rho(770) in the P0-wave.

Detection of f2(1270) in the D0-wave and a broad enhancement below 1 GeV.

Abstract

A partial wave analysis of the centrally produced pi+pi- channel has been performed in pp collisions using an incident beam momentum of 450 GeV/c. An unambiguous physical solution has been found. Evidence is found for the f0(980), f0(1300), f0(1500) and fJ(1710) with J = 0 in the the S-wave. The rho(770) is observed dominantly in the P0-wave and the f2(1270) is observed dominantly in the D0-wave. In addition, there is evidence for a broad enhancement in the D-wave below 1 GeV.