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HK: Fachverband Hadronen und Kerne

HK 5: Hadron Structure and Spectroscopy II

HK 5.2: Invited Group Report

Monday, March 16, 2009, 14:30–15:00, H-ZO 30

Recent results from the COMPASS experiment at CERN — •Fabienne Kunne — IRFU CEA Saclay, France

COMPASS is a multipurpose fixed target experiment running at CERN, designed to scatter polarized muons as well as hadrons with energies of several hundred GeVs, on various targets, polarized or not. After having completed a program on nucleon spin physics (2002-2007), we are currently starting a program on light meson spectroscopy (2008-2009).

All recent results on spin physics will be discussed. They include measurements of the gluon polarization from both the open charm and the high pT channels, extraction of the strange quark polarization, measurement of the longitudinal polarization of lambda and anti lambda, and results on transversity among which the Collins and Sivers asymmetries on the proton. First results on meson spectroscopy will be shortly summarized and plans for the future will be presented.