Mainz 2004 – wissenschaftliches Programm
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T: Teilchenphysik
T 107: QCD I
T 107.4: Vortrag
Montag, 29. März 2004, 16:45–17:00, RW 5
First measurements of transverse spin asymmetries at COMPASS — •Rainer Joosten1, Jens Bisplinghoff1, Franco Bradamante2, Wolfgang Eyrich3, Horst Fischer4,5, Anna Martin2, Paolo Pagano2, and Richard Webb3 — 1Helmholtz-Institut für Strahl- und Kernphysik, Universität Bonn — 2Università degli Studi and INFN, Trieste — 3Physikalisches Institut, Friedrich-Alexander-Universität Erlangen-Nürnberg — 4Albert-Ludwigs-Universität Freiburg — 5CERN, Geneva
COMPASS is a fixed target experiment on the SPS M2 beamline at CERN. Its 6LiD target can be polarised both longitudinally and transversally with respect to the polarised 160GeV µ+ beam. Approximately 20% of the beam-time in 2002 and 2003 was spent in the transverse configuration. The analysis of semi-inclusive deep inelastic events in transverse mode opens up a number of channels to investigate the transverse quark distribution function ΔT q(x) and its associated structure function h1. One of these is the azimuthal asymmetry in single pion production, the so-called Collins effect. During the 2002 beam time COMPASS collected approximately 1.2 · 107 tranversely polarised SIDIS events, enabling a first determination of the Collins asymmetry. Preliminary results of this analysis will be reported. This work was supported by the BMBF.