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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 Fischer^4,5, 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 Δ_T 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.