Transverse spin effects in hadron-pair production from semi-inclusive deep inelastic scattering

Details Transverse spin effects in hadron-pair production from semi-inclusive deep inelastic scattering Transverse spin effects in hadron-pair production from semi-inclusive deep inelastic scattering

2012-02-28

arxiv.org/abs/1202.6150v1

Physics

High Energy Physics

High Energy Physics - Experiment

13 pages, 4 figures

Scientific paper

First measurements of azimuthal asymmetries in hadron-pair production in deep-inelastic scattering of muons on transversely polarised ^6LiD (deuteron) and NH_3 (proton) targets are presented. The data were taken in the years 2002-2004 and 2007 with the COMPASS spectrometer using a muon beam of 160 GeV/c at the CERN SPS. The asymmetries provide access to the transversity distribution functions, without involving the Collins effect as in single hadron production. The sizeable asymmetries measured on the NH_ target indicate non-vanishing u-quark transversity and two-hadron interference fragmentation functions. The small asymmetries measured on the ^6LiD target can be interpreted as indication for a cancellation of u- and d-quark transversities.

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