A study of the eta etaprime and etaprime etaprime channels produced in central pp interactions at 450 GeV/c

TL;DR

This paper reports the first observation of eta eta' and eta' eta' production in central pp interactions at 450 GeV/c, revealing new resonant structures and quantum number assignments.

Contribution

It presents the first observation of these channels in central production and identifies specific resonant states and quantum numbers.

Findings

Evidence for f0(1500) in eta eta' channel

Peak at 1.95 GeV in eta eta' channel

Peak at threshold in eta' eta' channel compatible with JPC=2++

Abstract

The reactions pp -> pf (X0) ps, where X0 is observed decaying to eta etaprime and etaprime etaprime, have been studied at 450 GeV/c. This is the first time that these channels have been observed in central production and only the second time that the etaprime etaprime channel has been observed in any production mechanism. In the eta etaprime channel there is evidence for the f0(1500) and a peak at 1.95 GeV. The etaprime etaprime channel shows a peak at threshold which is compatible with having JPC = 2++ and spin projection JZ = 0.