1.
Phys Rev Lett
; 103(15): 152002, 2009 Oct 09.
Artículo
en Inglés
| MEDLINE
| ID: mdl-19905623
RESUMEN
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 pi(+), pi(0), and K(+/-), as well as in the difference of the pi(+) and pi(-) cross sections.