Evidence for a Transverse Single-Spin Asymmetry in Leptoproduction of pi+pi- Pairs

Details Evidence for a Transverse Single-Spin Asymmetry in Leptoproduction of pi+pi- Pairs Evidence for a Transverse Single-Spin Asymmetry in Leptoproduction of pi+pi- Pairs

2008-03-16

arxiv.org/abs/0803.2367v2

JHEP 0806:017,2008

Physics

High Energy Physics

High Energy Physics - Experiment

18 pages, 4 figures, 1 table; minor revisions to content for clarity

Scientific paper

10.1088/1126-6708/2008/06/017

A single-spin asymmetry was measured in the azimuthal distribution of pi+pi- pairs produced in semi-inclusive deep-inelastic scattering on a transversely polarized hydrogen target. For the first time, evidence is found for a correlation between the transverse target polarization and the azimuthal orientation of the plane containing the two pions.The corresponding single-spin asymmetry is expected to be related to the product of the little-known quark transversity distribution function and an unknown naive-T-odd chiral-odd dihadron fragmentation function.

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