QCD Hard Scattering and the Sign of the Spin Asymmetry A_LL^pi

Details QCD Hard Scattering and the Sign of the Spin Asymmetry A_LL^pi QCD Hard Scattering and the Sign of the Spin Asymmetry A_LL^pi

2003-10-16

arxiv.org/abs/hep-ph/0310197v2

Phys.Rev.Lett. 92 (2004) 121803

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 3 figures, final version published in PRL (only minor changes; note: title changed in published version)

Scientific paper

10.1103/PhysRevLett.92.121803

Recent preliminary PHENIX data are consistent with a negative and sizable longitudinal double-spin asymmetry A_LL^pi for pi^0 production at moderate transverse momentum p_perp \simeq 1 - 4 GeV and central rapidity. By means of a systematic investigation of the relevant degrees of freedom we show that the perturbative QCD framework at leading power in p_perp produces at best a very small negative asymmetry in this kinematic range.

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