Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2005-04-14
Acta Phys.Hung. A25 (2006) 347-353
Physics
High Energy Physics
High Energy Physics - Experiment
6 pages, contribution to the proceedings for the 21st Winter Workshop on Nuclear Dynamics
Scientific paper
10.1556/APH.25.2006.2-4.24
For the first time single-spin asymmetries in semi-inclusive pion production are measured by the HERMES experiment with a transversely polarised hydrogen target. Two different sine-modulations are extracted which can be related to the transversity \delta q(x) and Sivers f_{1T}^{\perp q}(x) quark distribution functions. The extracted sine-moments still contain small sub-leading twist contributions which can be extracted from HERMES data combining the results from the transversely polarised hydrogen target with previously measured results from a longitudinally polarised hydrogen target.
Elschenbroich U.
for the HERMES Collaboration
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