Mainz 2012 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 8: Hadronenstruktur und -spektroskopie

HK 8.5: Talk

Monday, March 19, 2012, 17:45–18:00, RW 1

Analysis of diffractive dissociation of exclusive K⁻ π⁺ π⁻ events in the high energetic hadron beam of the COMPASS-experiment — •Prometeusz Jasinski¹ and for the COMPASS Collaboration² — ¹Institut für Kernphysik, Universität Mainz, Johann-Joachim-Becherweg 45, 55099 Mainz — ²CERN

The COMPASS experiment at CERN took data with a 190 GeV/c hadron beam hitting a liquid hydrogen target in the years 2008 and 2009. The main purpose is the study of the light meson spectrum in the context of non-pertubative QCD.

The negative hadron beam contains mainly pions but also a small fraction of about 2.5% of kaons, giving access to production mechanisms of isospin 1/2 resonances. One of the channels of interest is diffractively produced resonances decaying into the K⁻ π⁺ π⁻ final state. I will discuss the data selection and quality studies for this channel. The invariant mass spectra show already the well known resonances as the K₁(1270) K₁(1400) and the K₂(1770). To disentangle all contributing resonances, techniques of mass-indendent partial wave analysis are applied. Most important results are discussed.

Supported by BMBF under the contract 06MZ224