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Evidence for a Transverse Single-Spin Asymmetry in Leptoproduction of π + π − Pairs Hermes



Abstract: A single-spin asymmetry was measured in the azimuthal distribution of π + π − 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 chiralodd dihadron fragmentation function

Topics: Lepton-Nucleon Scattering
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