Diffractive Dissociation of 190 GeV/c ${\pi }^{-}$ into ${\pi }^{-}{\pi }^{+}{\pi }^{-}$ Final States at COMPASS

Abstract

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.

3 pages, 3 figures, proceedings of the "11th International Workshop on Meson Production, Properties, and Interaction" (MESON2010), Krakow, Poland, June 10 - 15, 2010

References in corpus (2)

• The COMPASS Experiment at CERN
• Observation of a J^PC = 1-+ exotic resonance in diffractive dissociation of 190 GeV/c pi- into pi- pi- pi+