A partial wave analysis of proton-antiproton annihilation above threshold for phi phi production in the JETSET experiment

The JETSET experiment (PS202) conducted at CERN was designed to search for gluonic resonances in the mass range between 2.1 and 2.4 GeV using the channel pp to phi phi . This channel is OZI suppressed, thus any observed enhancement of the cross section beyond expectations of theOZI rule could indicate possible resonating gluonic degrees of freedom. Infact, the measured cross section is two orders of magnitude beyond OZI expectations. Subsequent spin-parity analyses have suggested a resonance with adominant J = 2 spin component and a parity of +1. Recently, another spin-parity analysis has been performed. This analysis includes the possibility of coherent interference with a scaler background. It will be summarized that the overall fit quality improves when coherent interference is included. A dominant spin component of J = 2 still emerges but a J = 4 component is also present.