Abstract
We present a new global QCD analysis of parton distribution functions, allowing for possible intrinsic charm (IC) contributions in the nucleon inspired by light-front models. The analysis makes use of the full range of available high-energy scattering data for and , including fixed-target proton and deuteron cross sections at lower energies that were excluded in previous global analyses. The expanded data set places more stringent constraints on the momentum carried by IC, with at most 0.5% (corresponding to an IC normalization of ) at the level for . We also critically assess the impact of older EMC measurements of at large , which favor a nonzero IC, but with very large values.
- Received 7 August 2014
DOI:https://doi.org/10.1103/PhysRevLett.114.082002
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