Twist-three Fragmentation Function Contribution to the Single Spin Asymmetry in pp Collisions

Details Twist-three Fragmentation Function Contribution to the Single Spin Asymmetry in pp Collisions Twist-three Fragmentation Function Contribution to the Single Spin Asymmetry in pp Collisions

2010-02-02

arxiv.org/abs/1002.0399v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 3 ps figures

Scientific paper

We study the twist-three fragmentation function contribution to the single transverse spin asymmetries in inclusive hadron production in pp collisions, pp->h+X. In particular, we evaluate the so-called derivative contribution which dominates the spin asymmetry in the forward direction of the polarized proton. With certain parametrizations for the twist-three fragmentation function, we estimate its contribution to the asymmetry of pi0 production at RHIC energy. We find that the contribution is sizable and might be responsible for the big difference between the asymmetries in eta and pi0 productions observed by the STAR collaboration at RHIC.

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