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COMPASS is a fixed-target experiment at CERN SPS which focused on light-quarkhadron spectroscopy during the data taking in 2008 and 2009. A world-leadingdata set was collected with a 190GeV/c hadron beam impinging on a liquidhydrogen target in order to study the central production of glueballcandidates.  In this report, we motivate double-Pomeron exchange as a relevant productionprocess for mesons without valence quark content. We select a centrallyproduced sample from the COMPASS data set recorded with a proton beam andintroduce a decomposition into partial waves. Particular attention is paid toinherent mathematical ambiguities in the amplitude analysis of two-pseudoscalarfinal states. Furthermore, we show a simple parametrisation for the centrallyproduced K+K- system which can describe the mass dependence of the fit resultswith sensible Breit-Wigner parameters.

A Partial-Wave Analysis of Centrally Produced Two-Pseudoscalar Final States in pp Reactions at COMPASS