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arXiv · 1310.3734

Impact of hadronic and nuclear corrections on global analysis of spin-dependent parton distributions

P. Jimenez-Delgado·A. Accardi·W. Melnitchouk
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Abstract

We present the first results of a new global next-to-leading order analysis of spin-dependent parton distribution functions from the most recent world data on inclusive polarized deep-inelastic scattering, focusing in particular on the large-x and low-Q^2 regions. By directly fitting polarization asymmetries we eliminate biases introduced by using polarized structure function data extracted under nonuniform assumptions for the unpolarized structure functions. For analysis of the large-x data we implement nuclear smearing corrections for deuterium and 3He nuclei, and systematically include target mass and higher twist corrections to the g_1 and g_2 structure functions at low Q^2. We also explore the effects of Q^2 and W^2 cuts in the data sets, and the potential impact of future data on the behavior of the spin-dependent parton distributions at intermediate and large x.

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P. Jimenez-Delgado, A. Accardi, W. Melnitchouk. 2013-10-14. Impact of hadronic and nuclear corrections on global analysis of spin-dependent parton distributions. https://doi.org/10.1103/physrevd.89.034025

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