A study of the etapipi channel produced in central pp interactions at 450 GeV/c

TL;DR

This paper investigates the eta pi pi channel produced in central pp interactions at 450 GeV/c, identifying decay modes of specific resonances and providing evidence for certain decay channels while ruling out others.

Contribution

It provides new experimental evidence for decay modes of eta2(1645) and eta2(1870) resonances in high-energy proton-proton collisions.

Findings

Evidence for a2(1320)pi decay of eta2(1645) and eta2(1870)

Evidence for a0(980)pi decay of both resonances

Evidence for f2(1270)eta decay of eta2(1870)

Abstract

The reaction pp -> pf (eta pi pi) ps has been studied at 450 GeV/c. There is clear evidence for an a2(1320)pi decay mode of the eta2(1645) and eta2(1870). In addition, there is evidence for an a0(980)pi$ decay mode of both resonances and an f2(1270)eta decay mode of the eta2(1870). No evidence is found for a JPC = 2++ a2(1320)pi wave.