Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2010-08-23
Int.J.Mod.Phys.A26:647-649,2011
Physics
High Energy Physics
High Energy Physics - Experiment
3 pages, 3 figures, proceedings of the "11th International Workshop on Meson Production, Properties, and Interaction" (MESON20
Scientific paper
10.1142/S0217751X11052347
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.
for the COMPASS Collaboration
Grube Boris
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