Twist-three fragmentation function contribution to the single spin asymmetry in pp collisions |
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Authors: | Zhong-Bo Kang Feng Yuan Jian Zhou |
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Affiliation: | 1. RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, NY 11973, United States;2. Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States |
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Abstract: | We study the twist-three fragmentation function contribution to the single transverse spin asymmetries in inclusive hadron production in pp collisions, p↑p→h+X. In particular, we calculate the associated derivative terms which dominate the spin asymmetries in these processes. With certain parameterizations for the twist-three fragmentation function, we estimate its contribution to the single spin asymmetry of π0 production at RHIC energy. We find that the contribution is sizable and might be responsible for the big difference between the asymmetries in η and π0 productions observed by the STAR collaboration at RHIC. |
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Keywords: | Single spin asymmetry Collinear factorization Twist-three fragmentation function Collins effect |
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