Abstract
Single-spin asymmetries for pions and charged kaons are measured in semi-inclusive deep-inelastic scattering of positrons and electrons off a transversely nuclear-polarized hydrogen target. The dependence of the cross section on the azimuthal angles of the target polarization (ΦS) and the produced hadron (Φ) is found to have a substantial sin(Φ+ΦS) modulation for the production of π+, π- and K+. This Fourier component can be interpreted in terms of non-zero transversity distribution functions and non-zero favored and disfavored Collins fragmentation functions with opposite sign. For π0 and K- production the amplitude of this Fourier component is consistent with zero.
| Original language | English |
|---|---|
| Pages (from-to) | 11-16 |
| Number of pages | 6 |
| Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
| Volume | 693 |
| Issue number | 1 |
| DOIs | |
| State | Published - Sep 2010 |
Keywords
- Collins function
- Polarized structure functions
- Semi-inclusive DIS
- Single-spin asymmetries
- Transversity