Dresden 2013 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 2: Hadronenstruktur und -spektroskopie

HK 2.5: Talk

Monday, March 4, 2013, 12:15–12:30, HSZ-105

A Partial-Wave Analysis of Centrally Produced Two-Pseudoscalar Final States in pp Reactions at COMPASS — •Alexander Austregesilo — Physik-Department E18, Technische Universität München

COMPASS is a fixed-target experiment at CERN SPS which investigates the structure and dynamics of hadrons. The experimental setup features a large acceptance and high momentum resolution spectrometer including particle identification and calorimetry and is therefore ideal to access a broad range of different final states. In 2008 and 2009, COMPASS collected a world-leading data set with a 190 GeV/c hadron beam impinging on either liquid hydrogen or nuclear (Pb, Ni) targets. Spin-exotic meson as well as glueball candidates formed in both diffractive dissociation and central production are presently studied.

The double-pomeron-exchange process is believed to provide a gluon-rich environment, where the production of mesons without valence quark content (glueballs) is enhanced. The lightest glueball candidates are expected in the scalar sector, which is studied in π⁺π⁻ and K⁺K⁻ decay channels. We introduce a model to describe the selected data in terms of partial waves. The spin-parity decomposition is complicated by mathematical ambiguities inherent to two-pseudoscalar final states. We present preliminary resonance parameters extracted from fits to the data and compare the results to previous experiments.

Supported by BMBF, MLL and the Cluster of Excellence Exc153 ’Origin and Structure of the Universe’