Effects of transversity in deep-inelastic scattering by polarized protons

Details Effects of transversity in deep-inelastic scattering by polarized protons Effects of transversity in deep-inelastic scattering by polarized protons

2010-06-22

arxiv.org/abs/1006.4221v1

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 3 figures

Scientific paper

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 (phi_S)and the produced hadron (phi) is found to have a substantial sin(phi+phi_S) modulation for the production of pi+, pi- 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 pi0 and K- production the amplitude of this Fourier component is consistent with zero.

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