Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2010-07-17
AIP Conf.Proc.1257:286-292,2010
Physics
High Energy Physics
High Energy Physics - Experiment
7 pages, 7 figures, to appear in the AIP Conf. Proc., Hadron 2009, XIII Intern. Conference on Hadron Spectroscopy, Nov 29th -
Scientific paper
10.1063/1.3483335
The COMPASS experiment at CERN is designed for light hadron spectroscopy with emphasis on the detection of new states, in particular the search for exotic states and glue-balls. After a short pilot run in 2004 (190 GeV/c negative pion beam, lead target) showing significant production strength for an exotic $J^{PC}=1^{-+}$ state at 1.66\,GeV/${\rm c^2}$, we have collected data with a 190 GeV/c negative charged hadron beam on a proton (liquid hydrogen) and nuclear targets in 2008 and 2009. The spectrometer features good coverage by electromagnetic calorimetry, and our data provide excellent opportunity for simultaneous observation of new states in two different decay modes in the same experiment. The diffractively produced $(3\pi)^{-}$ system for example can be studied in both modes $\pi^{-}p \rightarrow \pi^{-}\pi^{+}\pi^{-}p$ and $\pi^{-}~p \rightarrow \pi^{-}\pi^{0}\pi^{0}~p$. Charged and neutral mode rely on completely different parts of the spectrometer. Observing a new state in both modes provides important cross-check. First results of a preliminary PWA performed on the 2008 data are presented.
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