Odd and Even Partial Waves of ηπ^- and η'π^- in 191 GeV/c π^-p

Abstract

In the year 2008 COMPASS recorded diffractive events of the signature π^-(191 GeV) p --> X_fast p. We present results of the analysis of the subsystems X = η(')π^-. Besides the known resonances a_2(1320), a_4(2040), we study the properties of the spin-exotic P+ wave, and all other natural-exchange partial waves up to spin J = 6. We find a striking difference between the two final states: whereas the even partial waves J = 2, 4, 6 in the two systems are related by phase-space factors, the odd partial waves are relatively suppressed in the ηπ^- system. The relative phases between the even waves appear identical whereas the phase between the D and P waves behave quite differently, suggesting different resonant and non-resonant contributions in the two odd-angular-momentum systems. Branching ratios and parameters of the well-known resonances a_2 and a_4 are measured.

To appear in the proceedings of the XV International Conference on Hadron Spectroscopy-Hadron 2013

References in corpus (1)

• The COMPASS Experiment at CERN

Cited by in corpus (1)

• Odd and Even Partial Waves of $\eta {\pi }^{-}$ and ${\eta }^{\prime }{\pi }^{-}$ in ${\pi }^{-}p\to {\eta }^{(\prime )}{\pi }^{-}p$ at $191\text{GeV}/c$