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

P. Jimenez-Delgado1, A. Accardi1,2, and W. Melnitchouk1 (Jefferson Lab Angular Momentum (JAM) Collaboration)

  • 1Jefferson Lab, Newport News, Virginia 23606, USA
  • 2Hampton University, Hampton, Virginia 23668, USA

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Phys. Rev. D 89, 034025 – Published 25 February, 2014

DOI: https://doi.org/10.1103/PhysRevD.89.034025

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-Q2 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 He3 nuclei, and systematically include target mass and higher twist corrections to the g1 and g2 structure functions at low Q2. We also explore the effects of Q2 and W2 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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Phys. Rev. D 89, 034025– Published 25 February, 2014
  • Received 18 October 2013

© 2014 American Physical Society

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