Diffractive Dissociation into $\pi^{-}\pi^{-}\pi^{+}$ Final States at COMPASS

Haas, Florian

doi:10.1063/1.3647141

Article
Report number	arXiv:1109.1789
Title	Diffractive Dissociation into $\pi^{-}\pi^{-}\pi^{+}$ Final States at COMPASS
Author(s)	Haas, Florian (Munich, Tech. U.)
Collaboration	on behalf of the COMPASS collaboration
Publication	2011-10-25
Imprint	09 Sep 2011
Number of pages	7
In:	AIP Conf. Proc. 1374 (2011) 273
In:	14th International Conference on Hadron Spectroscopy, München, Bayern, Germany, 13 - 17 Jun 2011, pp.273
DOI	10.1063/1.3647141
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN SPS ; COMPASS NA58
Abstract	Diffractive dissociation reactions studied at the COMPASS experiment at CERN provide access to the light-meson spectrum. During a pilot run in 2004, using a pion beam and a lead target, 420k $\pi^{-}\pi^{-}\pi^{+}$ final-state events with masses below 2.5 GeV/c$^{2}$ were recorded, yielding a significant spin-exotic signal for the controversial $\pi_{1}$(1600) resonance. After a significant upgrade of the spectrometer in 2007, the following two years were dedicated to meson spectroscopy. Using again a pion beam, but now with a liquid hydrogen target, an unique statistics of 100M events of the same final state was gathered in 2008. During a short campaign in 2009, the H$_{2}$ target was exchanged by several solid state targets in order to compare final states produced on targets with different atomic numbers. A partial-wave Analysis (PWA) was performed on all these data sets and results are presented.
Copyright/License	arXiv nonexclusive-distrib. 1.0