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.
- Lepton-nucleon scattering
ASJC Scopus subject areas
- Nuclear and High Energy Physics