Analysis of diffractive dissociation of exclusive K- π+ π- events in the high energetic hadron beam of the COMPASS-experiment

In order to study the production of exotic mesons 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 negative hadron beam contains mainly pions and a small fraction of about 2.5% of kaons. Kaons are identified using CEDAR PID detectors in the beamline. One of the channels of interest is diffractively produced resonance decaying into the K-π+π- final state. I 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 partial wave analysis are applied. A short review on this studies is presented.