Intrinsic Charm Parton Distribution Functions from CTEQ-TEA Global Analysis

Sayipjamal Dulat; Tie-Jiun Hou; Jun Gao; Joey Huston; Jon Pumplin; Carl Schmidt; Daniel Stump; C. -P. Yuan

Paper

Intrinsic Charm Parton Distribution Functions from CTEQ-TEA Global Analysis

Abstract

We study the possibility of intrinsic (non-perturbative) charm in parton distribution functions (PDF) of the proton, within the context of the CT10 next-to-next-to-leading order (NNLO) global analysis. Three models for the intrinsic charm (IC) quark content are compared: (i)

(zero-IC model); (ii)

is parametrized by a valence-like parton distribution (BHPS model); (iii)

is parametrized by a sea-like parton distribution (SEA model). In these models, the intrinsic charm content,

, is included in the charm PDF at the matching scale

GeV. The best fits to data are constructed and compared. Correlations between the value of

and the amount of IC are also considered.