Dortmund 2006 – scientific programme

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T: Teilchenphysik

T 401: QCD Theorie I

T 401.3: Talk

Wednesday, March 29, 2006, 17:00–17:20, HG2-HS2

Single spin asymmetries in semi-inclusive deeply inelastic scattering, and in Drell-Yan — •P. Schweitzer¹, J.C. Collins^2,1, A.V. Efremov³, K. Goeke¹, M. Grosse Perdekamp^4,5, S. Menzel¹, B. Meredith⁴, and A . Metz¹ — ¹Institut für Theoretische Physik II, Ruhr-Universität Bochum, D-44780 Bochum — ²Penn State University, 104 Davey Lab, University Park PA 16802, USA — ³Joint Institute for Nuclear Research, Dubna, 141980 Russia — ⁴University of Illinois, Urbana, IL 61801, USA — ⁵RIKEN BNL Research Center, Upton, New York 11973, USA

Recently the HERMES and COMPASS-Collaborations published data on single spin asymmetries in deeply inelastic production of hadrons from transversely polarized targets. These data allow to access the so-called Collins and Sivers effects — cleanly separated from each other. Hence, these data provide first information for several novel distribution and fragmentation functions, which have been subject to considerable theoretical and phenomenological interest in the past: The transversity distribution h₁(x), the Collins fragmentation function H₁^⊥(z) and the Sivers distribution function f_1T^⊥(x). Different analyses of these data are discussed, and various extractions of the Sivers and Collins functions are compared. The consistency of the HERMES and COMPASS results (from different targets) is demonstrated. Predictions for future experiments are made.