Measurement of the Spin Asymmetry in the Photoproduction of Pairs of High-pT Hadrons at HERMES

Details Measurement of the Spin Asymmetry in the Photoproduction of Pairs of High-pT Hadrons at HERMES Measurement of the Spin Asymmetry in the Photoproduction of Pairs of High-pT Hadrons at HERMES

1999-07-14

arxiv.org/abs/hep-ex/9907020v1

Phys.Rev.Lett.84:2584-2588,2000

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages (latex), 4 figures (eps)

Scientific paper

10.1103/PhysRevLett.84.2584

We present a measurement of the longitudinal spin asymmetry A_|| in photoproduction of pairs of hadrons with high transverse momentum p_T. Data were accumulated by the HERMES experiment using a 27.5 GeV polarized positron beam and a polarized hydrogen target internal to the HERA storage ring. For h+h- pairs with p_T^h_1 > 1.5 GeV/c and p_T^h_2 > 1.0 GeV/c, the measured asymmetry is A_|| = -0.28 +/- 0.12 (stat.) +/- 0.02 (syst.). This negative value is in contrast to the positive asymmetries typically measured in deep inelastic scattering from protons, and is interpreted to arise from a positive gluon polarization.

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