%0 Journal Article
%T Diffractive Dissociation of 190 GeV/c $¦Ð^-$ into $¦Ð^-¦Ð^+¦Ð^-$ Final States at COMPASS
%A Boris Grube
%A for the COMPASS Collaboration
%J Physics
%D 2010
%I arXiv
%R 10.1142/S0217751X11052347
%X We present results from a Partial-Wave Analysis (PWA) of diffractive dissociation of 190 GeV/c $\pi^-$ into $\pi^-\pi^+\pi^-$ final states on nuclear targets. A PWA of the data sample taken during a COMPASS pilot run in 2004 on a Pb target showed a significant spin-exotic $J^{PC} = 1^{-+}$ resonance consistent with the controversial $\pi_1(1600)$, which is considered to be a candidate for a non-$q\bar{q}$ mesonic state. In 2008 COMPASS collected a large diffractive $\pi^-\pi^+\pi^-$ data sample using a hydrogen target. A first comparison with the 2004 data shows a strong target dependence of the production strength of states with spin projections $M = 0$ and 1.
%U http://arxiv.org/abs/1008.3838v2