Köln 2004 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 17: Electromagnetic and Hadronic Probes II
HK 17.2: Gruppenbericht
Dienstag, 9. März 2004, 16:00–16:30, B
First measurements of transverse spin asymmetries at COMPASS — •Richard Webb1, Jens Bisplinghoff2, Franco Bradamante3, Wolfgang Eyrich1, Horst Fischer4,5, Rainer Joosten2, Anna Martin3, and Paolo Pagano3 — 1Physikalisches Institut, Friedrich-Alexander-Universität Erlangen-Nürnberg — 2Helmholtz-Institut für Strahl- und Kernphysik, Universität Bonn — 3Università degli Studi and INFN, Trieste — 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.