Friday, December 7, 2012

1212.1221 (Zhong-Bo Kang et al.)

Transverse momentum-weighted Sivers asymmetry in semi-inclusive deep
inelastic scattering at next-to-leading order
   [PDF]

Zhong-Bo Kang, Ivan Vitev, Hongxi Xing
We study the next-to-leading order perturbative QCD corrections to the transverse momentum-weighted Sivers asymmetry in semi-inclusive hadron production in lepton-proton deep inelastic scattering. The corresponding differential cross section is evaluated as a convolution of a twist-three quark-gluon correlation function, often referred to as Qiu-Sterman function, the usual unpolarized fragmentation function, and a hard coefficient function. By studying the collinear divergence structure, we identify the evolution kernel for the Qiu-Sterman function. The hard coefficient function, which is finite and free of any divergence, is evaluated at one-loop order.
View original: http://arxiv.org/abs/1212.1221

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