Transverse Spin Physics at HERMES

Abstract

HERMES has measured azimuthal single-spin asymmetries of charged pions produced in deep-inelastic scattering of positrons on a transversely polarised hydrogen target. The presented azimuthal moments provide access to two yet unknown quark distribution functions, the transversity distribution function δq and the Sivers function f_{1T}^{perp}.

4 pages, 2 figures, contribution to the proceedings for the XLIrst Rencontres de Moriond (QCD and High Energy Hadronic Interactions), March 18th to 25th, 2006, La Thuile, Italy