## 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 (US) |
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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 |

Externally published | Yes |

## Keywords

- Collins function
- Polarized structure functions
- Semi-inclusive DIS
- Single-spin asymmetries
- Transversity

## ASJC Scopus subject areas

- Nuclear and High Energy Physics