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Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 67: Poster Session

HK 67.16: Poster

Thursday, March 19, 2009, 14:00–16:00, Audi-Max

Diffractive Dissociation into 3 Pion Final States at COMPASSSuh-Urk Chung1,2, Jan Friedrich1, Stefanie Grabmüller1, •Florian Haas1, Bernhard Ketzer1, Sebastian Neubert1, Stephan Paul1, Dimitry Ryabchikov1,3, and Quirin Weitzel11Technische Universität München, Physik Department E18, 85748 Garching, Germany — 2Brookhaven National Laboratory, Upton, NY 11973, USA — 3Institute for High Energy Physics, 142284 Protvino, Russia

Diffractive dissociation reactions at the COMPASS experiment, CERN, provide access to the meson resonance spectrum. During a pilot run in 2004, using a pion beam on a lead target, a competitive number of π π π+ final state events with masses below 2.5 GeV/c2 were recorded. After COMPASS had finished its muon program in 2007, it used in 2008 again a pion beam, but now a liquid hydrogen target, and gathered during several weeks a unique high statistics. A full partial wave analysis of the 2004 data has been performed, with the focus on the kinematic range of a large momentum transfer (0.1 GeV2/c2 ≤ t’ ≤ 1.0 GeV2/c2). In addition first results of the adjacent analysis with 2008 data will be presented.

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