Answers are grounded in this paper and cite their sources.
Azimuthal single-spin asymmetries of leptoproduced pions and charged kaons were measured on a transversely polarized hydrogen target. Evidence for a naive-T-odd, transverse-momentum-dependent parton distribution function is deduced from nonvanishing Sivers effects for π⁺, π⁰, and K^±, as well as in the difference of the π⁺ and π^- cross sections.
No takes yet. Share an insight, caveat, or question.
Airapetian et al. (2009) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: