Mainz 2012 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 22: Hadronenstruktur und -spektroskopie
HK 22.3: Talk
Wednesday, March 21, 2012, 14:45–15:00, RW 1
Partial-Wave Analysis of the Centrally Produced π+π− System in pp Reactions at COMPASS — •Alexander Austregesilo1, Boris Grube1, Stephan Paul1, and Tobias Schlüter2 — 1Technische Universität München — 2Ludwig-Maximilians-Universität München
COMPASS is a fixed-target experiment at CERN SPS which investigates the structure and spectroscopy of hadrons. During 9 weeks in 2008 and 2009, a 190 GeV/c proton beam impinging on a liquid hydrogen target was used in order to study the production of exotic mesons and glueball candidates at central rapidities. As no bias on the production mechanism was introduced by the trigger system, the contribution from diffractive dissociation of the beam proton poses a challenge. Several approaches were tried to disentangle a clean, centrally produced sample. A model to describe the data in terms of partial-waves will be introduced. Furthermore, preliminary fits will be presented and compared to results from previous experiments. Particular attention has to be paid to the ambiguities in the amplitude analysis of the two-pseudoscalar final state.