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HK: Fachverband Hadronen und Kerne

HK 67: Poster Session

HK 67.16: Poster

Donnerstag, 19. März 2009, 14:00–16:00, Audi-Max

Diffractive Dissociation into 3 Pion Final States at COMPASS — Suh-Urk Chung^1,2, Jan Friedrich¹, Stefanie Grabmüller¹, •Florian Haas¹, Bernhard Ketzer¹, Sebastian Neubert¹, Stephan Paul¹, Dimitry Ryabchikov^1,3, and Quirin Weitzel¹ — ¹Technische 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.