Journal
PHYSICS LETTERS B
Volume 672, Issue 2, Pages 166-171Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2009.01.004
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Funding
- RFBR [02-06-16659]
- Helmholtz Gemeinschaft [VH-NG-105]
- DFG [SFB/TR 9]
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We study the perturbative QCD corrections to the heavy-quark structure functions of charged-lepton deep-inelastic scattering and their impact on global fits of parton distributions. We include the logarithmically enhanced terms near threshold due to soft gluon resummation in the QCD corrections at next-to-next-to-leading order. We demonstrate that this approximation is sufficient to describe the available HERA data in most parts of the kinematic region. The threshold-enhanced next-to-next-to-leading order corrections improve the agreement between predictions based on global fits of the parton distribution functions and the HERA collider data even in the small-x region. (C) 2009 Published by Elsevier B.V.
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