Analyzing powers in inclusive pion production at high energy and the nucleon spin structure

Details Analyzing powers in inclusive pion production at high energy and the nucleon spin structure Analyzing powers in inclusive pion production at high energy and the nucleon spin structure

1999-05-28

arxiv.org/abs/hep-ph/9905530v1

Mod.Phys.Lett. A14 (1999) 1403-1412

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 4 figures, latex

Scientific paper

10.1142/S0217732399001504

Analyzing powers in inclusive pion production in high energy transversely polarized proton-proton collisions are studied theoretically in the framework of the quark recombination model. Calculations by assuming the SU(6) spin-flavor symmetry for the nucleon structure disagree with the experiments. We solve this difficulty by taking into account the %We overcome this difficulty by taking into account the realistic spin distribution functions of the nucleon, which differs from the SU(6) expectation at large $x$, %but coincides with a perturbative QCD constraint on the ratio of the unpolarized valence distributions, $u/d \to 5$ as $x \to 1$. We also discuss the kaon spin asymmetry and find $A_N(K^+) = -A_N(K^0)$ in the polarized proton-proton collisions at large $x_F$.

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