Münster 2011 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 48: Hauptvorträge V

HK 48.2: Invited Talk

Thursday, March 24, 2011, 12:15–12:45, HS1

Recent Results from the COMPASS Experiment — •Boris Grube — Physik-Department E18, Technische Universität München

COMPASS is a multi-purpose fixed-target experiment at the CERN Super Proton Synchrotron investigating the structure and spectrum of hadrons by scattering high energetic hadrons and polarized muons off various targets. In the years 2002 through 2007 COMPASS mainly focused on nucleon spin physics using 160 GeV/c polarized µ⁺ beams on a polarized ⁶LiD target. This included measurements of the gluon contribution to the nucleon spin using longitudinal target polarization as well as studies of transverse spin effects in the nucleon on a transversely polarized target.

The second part of the COMPASS physics program aims at a precise measurement of the light-quark meson spectrum, where the primary goal is to search for new hadronic states, in particular spin-exotic mesons and glueballs. COMPASS can measure charged as well as neutral final-state particles, so that resonances can be studied in different reactions and decay channels. In addition COMPASS can measure low-energy QCD constants like, e.g. the electromagnetic polarizability of the pion. After a short pilot run in 2004 with a 190 GeV/c π⁻ beam on a Pb target, which showed a significant spin-exotic J^PC = 1⁻⁺ resonance around 1660 MeV/c², COMPASS collected large data samples with negative and positive hadron beams on H₂, Ni, and Pb targets in 2008 and 2009. We will give an overview of the results and present the status of some ongoing analyses.