The exotic eta'pi- Wave in 190 GeV pi-p --> pi-eta'p at COMPASS
Abstract
A sample of 35,000 events of the type pi-p --> eta'pi-pslow (eta' --> eta pi-pi+, eta --> gamma gamma) with -t>0.1 GeV2/c2 was selected from COMPASS 2008 data for a partial-wave analysis. We study the broad P+ structure known from previous experiments at lower energies, in particular its phase motion relative to the D+-wave near the a2(1320) mass and relative to a broad D+-wave structure at higher mass. We also find the a4(2040). We compare kinematic plots for the eta'pi- and eta pi- final states.
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