New limits on intrinsic charm in the nucleon from global analysis of parton distributions

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 Q^{2}≳1 GeV^{2} and W^{2}≳3.5 GeV^{2}...

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Veröffentlicht in:	Physical review letters 2015-02, Vol.114 (8), p.082002-082002, Article 082002
Hauptverfasser:	Jimenez-Delgado, P, Hobbs, T J, Londergan, J T, Melnitchouk, W
Format:	Artikel
Sprache:	eng
Schlagworte:	Cross sections Deuterons Distribution functions Energy use f2c Nucleons Partons PHYSICS OF ELEMENTARY PARTICLES AND FIELDS Scattering
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container_end_page	082002
container_issue	8
container_start_page	082002
container_title	Physical review letters
container_volume	114
creator	Jimenez-Delgado, P Hobbs, T J Londergan, J T Melnitchouk, W
description	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 Q^{2}≳1 GeV^{2} and W^{2}≳3.5 GeV^{2}, 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 ⟨x⟩_{IC} at most 0.5% (corresponding to an IC normalization of ∼1%) at the 4σ level for Δχ^{2}=1. We also critically assess the impact of older EMC measurements of F_{2}^{c} at large x, which favor a nonzero IC, but with very large χ^{2} values.
doi_str_mv	10.1103/physrevlett.114.082002
format	Article
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source	American Physical Society Journals
subjects	Cross sections Deuterons Distribution functions Energy use f2c Nucleons Partons PHYSICS OF ELEMENTARY PARTICLES AND FIELDS Scattering
title	New limits on intrinsic charm in the nucleon from global analysis of parton distributions
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