Abstract
The aim of the COMPASS hadron program is to study the light-quark hadron spectrum, and in particular, to search for evidence of hybrids and glueballs. COMPASS is a fixed-target experiment at the SPS at CERN and features a two-stage spectrometer with high momentum resolution, large acceptance, particle identification and calorimetry. A short pilot run in 2004 resulted in the observation of a spin-exotic state with JPC=1−+ consistent with the debated π1(1600). In addition, Coulomb production at low momentum transfer data provide a test of chiral perturbation theory. During 2008 and 2009, a world leading data set was collected with the hadron beam, which is currently being analysed. The large statistics allows for a thorough decomposition of the data into partial waves. The COMPASS hadron data span over a broad range of channels and shed light on several different aspects of quantum chromodynamics.
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