Evidence for a 4th state related to the three JPC = 2++, pi- p -> phi phi n states explainable by 2++ Glueball production

TL;DR

This paper presents evidence for a new 4th state related to known JPC states, explained by 2++ glueball production, based on multiple experiments observing phi phi resonances that break OZI suppression.

Contribution

It provides experimental evidence supporting the existence of a 2++ glueball state causing OZI suppression breakdown in phi phi production.

Findings

Observation of three phi phi resonances in the 2.038 to 2.600 GeV mass range.

Resonances are consistent with a 2++ glueball hypothesis.

Possible connection between phi phi resonances and f2(1950) decay modes.

Abstract

Four separate experiments, observing the OZI forbidden disconnected reaction pi- p -> phi phi n with increasing statistics were consistent. These experiments very selectively completely broke down the OZI suppression by 3 phi phi resonances with IG JPC = 0+ 2++ in the observed mass region 2.038 to 2.600 GeV. The only viable proposed explanation has been that the IG JPC = 0+ 2++ Glueball expected in this mass region caused the hard glue in the disconnection to resonate and very selectively breakdown the OZI suppression for its quantum numbers only. Recently a p p central production spin analysis found the f2(1950) had a dominant decay mode f2(1270) pi pi. We consider if it is related to the phi phi resonances, and find that it likely is.