A study of pseudoscalar states produced centrally in pp interactions at 450 GeV/c

TL;DR

This paper investigates the production mechanisms of pseudoscalar mesons, specifically eta and etaprime, in proton-proton collisions at 450 GeV/c, revealing differences from pi0 production and challenging existing models like double Pomeron exchange.

Contribution

It provides new insights into the production mechanisms of eta and etaprime mesons, showing they differ from pi0 and do not align with double Pomeron exchange expectations.

Findings

Eta and etaprime have similar production mechanisms.

Their production differs from pi0.

Maximum cross sections occur at 90-degree azimuthal angles.

Abstract

A study has been made of pseudoscalar mesons produced centrally in pp interactions. The results show that the eta and etaprime appear to have a similar production mechanism which differs from that of the pi0. The production properties of the eta and etaprime are not consistent with what is expected from double Pomeron exchange. In addition the production mechanism for the eta and etaprime is such that the production cross section are greatest when the azimuthal angle between the pT vectors of the two protons is 90 degrees.