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COMPASS is a fixed-target experiment at the CERN SPS that studies thespectrum of light-quark hadrons. In 2009, it collected a large dataset using a$190\,$GeV$/c$ positive hadron beam impinging on a liquid-hydrogen target inorder to measure the central exclusive production of light scalar mesons. Oneof the goals is the search for so-called glueballs, which are hypotheticalmeson-like objects without valence-quark content. We study the decay of neutralresonances by selecting centrally produced pion pairs from the COMPASS dataset.The angular distributions of the two pseudoscalar mesons are decomposed interms of partial waves, where particular attention is paid to the inherentmathematical ambiguities. The large dataset allows us to perform a detailedanalysis in bins of the two squared four-momentum transfers carried by theexchange particles in the reaction. Possible parameterisations of the massdependence of the partial-wave amplitudes in terms of resonances are alsodiscussed.

Light Scalar Mesons in Central Production at COMPASS