FIZIKA B 20 (2011) 2, 117-130

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for the COMPASS Collaboration

Technische Universität München, Physik-Department E18, James-Franck-Straße, 85748 Garching, Germany, and
CERN PH-SME, 1211 Geneva 23, Switzerland,
E-mail address:

Received 1 February 2011;    Accepted 9 November 2011
Online 16 January 2012

COMPASS is a fixed-target experiment at the CERN SPS for the investigation of 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. Following the promising observation of a spin-exotic resonance during an earlier pilot run, COMPASS focused on light-quark hadron spectroscopy during the years 2008 and 2009. A data set, world leading in terms of statistics and resolution, has been collected with a 190 GeV/c hadron beam impinging on either liquid hydrogen or nuclear targets. Spin-exotic meson and glueball candidates formed in both diffractive dissociation and central production are presently studied. Since the beam composition includes protons, the excited baryon spectrum is also accessible. Furthermore, Primakoff reactions have the potential to determine radiative widths of the resonances and to probe chiral perturbation theory. An overview of the ongoing analyses will be presented. In particular, the employed partial-wave analysis techniques will be illustrated and recent results will be shown for a selection of final states.

PACS numbers: 13.85.-t, 14.20.Gk
UDC 539.126

Keywords: COMPASS experiment, structure and dynamics of hadrons, light-quark hadron spectroscopy, excited baryon spectrum

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