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HK: Fachverband Physik der Hadronen und Kerne
HK 9: Elektromagnetische und Hadronische Sonden
HK 9.2: Talk
Monday, March 10, 2008, 16:45–17:00, 1C
Investigation of Diffractive Pion Dissociation at COMPASS — •Quirin Weitzel1, Alexander Austregesilo1, Suh-Urk Chung1,2, Anna-Maria Dinkelbach1, Jan Friedrich1, Sergei Gerassimov1, Stefanie Grabmüller1, Florian Haas1, Christian Höppner1, Bernhard Ketzer1, Igor Konorov1, Markus Krämer1, Roland Kuhn1, Alexander Mann1, Thiemo Nagel1, Sebastian Neubert1, Stephan Paul1, and Dmitri Ryabchikov3 for the COMPASS collaboration — 1Technische Universität München, Physik-Department E18, 85748 Garching, Germany — 2Brookhaven National Laboratory, Upton, NY 11973, USA — 3Institute for High Energy Physics, 142284 Protvino, Russia
COMPASS is a fixed-target experiment at the CERN SPS, which investigates the structure and spectroscopy of hadrons. In 2004, a first run with a 190 GeV/c π− beam took place, using nuclear targets. Diffractive reactions in COMPASS provide clean access to meson resonances with masses below 2.5 GeV/c2, where candidates for spin-exotic states (e. g. 1−+) have been reported in the past. Within a few days of data taking, a competitive number of events on lead with π−π−π+ final states were recorded. In this talk we will report on the results of a first partial wave analysis of this data set.
This work is supported by the German Bundesministerium für Bildung und Forschung (06MT244), the Cluster of Excellence for Fundamental Physics (EXC153) and the Maier-Leibnitz-Labor der LMU und TU München.