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A sample of 35,000 events of the type pi-p --> eta'pi-p_slow (eta' --> etapi-pi+, eta --> gamma gamma) with -t>0.1 GeV^2/c^2 was selected from COMPASS2008 data for a partial-wave analysis. We study the broad P_+ structure knownfrom previous experiments at lower energies, in particular its phase motionrelative to the D_+-wave near the a_2(1320) mass and relative to a broadD_+-wave structure at higher mass. We also find the a_4(2040). We comparekinematic plots for the eta'pi^- and eta pi- final states.

The exotic eta'pi- Wave in 190 GeV pi-p --> pi-eta'p at COMPASS