Münster 2011 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 12: Hadronenstruktur und -spektroskopie IV
HK 12.7: Vortrag
Montag, 21. März 2011, 18:15–18:30, HS3
Diffractive and Coulomb Dissociation of pions into three charged pions at low momentum transfer at COMPASS — •Stefanie Grabmüller — Technische Universität München, Physik-Department E18, James-Franck-Straße, 85748 Garching
COMPASS is a multi-purpose fixed-target experiment at the CERN SPS, that investigates the structure and spectroscopy of hadrons. Dissociation of pions on nuclear or hydrogen targets provides clean access to the light meson spectrum. During a short run with a 190 GeV/c π− beam on lead in the year 2004, about 4 million exclusive π−π−π+ events have been collected. For the 3 million events with low momentum transfer t′<0.01 (GeV/c)2, coherent scattering off the nucleus as a whole can be assumed, with contributions from Reggeon, Pomeron and photon exchange. For the lowest t′<0.001 (GeV/c)2, the photo-produced part becomes apparent.
The status of the partial-wave analysis of these data will be presented, focussing on new techniques for the extraction of the photo-produced contribution, to be compared to ChPT calculations.
This work is supported by BMBF, Maier-Leibnitz-Labor München and the DFG Cluster of Excellence Exc153.