Evidence for a transverse single-spin asymmetry in leptoproduction of π+πpairs

HERMES Collaboration

Research output: Contribution to journalArticlepeer-review


A single-spin asymmetry was measured in the azimuthal distribution of π+πpairs 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.

Original languageEnglish (US)
Article number017
JournalJournal of High Energy Physics
Issue number6
StatePublished - Jun 1 2008


  • Lepton-nucleon scattering

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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