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Title: 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 Q2 ≥ 1 GeV2 and W2 ≥ 3.5 GeV2, including fixed-target proton and deuteron deep cross sections at lower energies that were excluded in previously 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 ΔX2 = 1. We also assess the impact of older EMC measurements of Fc2c at large x, which favor a nonzero IC, but with very large X2 values.
Authors:
 [1] ;  [2] ;  [3] ;  [1]
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  2. Indiana Univ., Bloomington, IN (United States); Univ. of Washington, Seattle, WA (United States)
  3. Indiana Univ., Bloomington, IN (United States)
Publication Date:
OSTI Identifier:
1171478
Report Number(s):
JLAB-THY--14-1931; DOE/OR/23177--3145; arXiv:1408.1708
Journal ID: ISSN 0031-9007; PRLTAO; ArticleNumber: 082002; TRN: US1600760
Grant/Contract Number:
PHY-1205019; FG02-87ER40365; FG02-97ER41014; AC05-06OR23177
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 114; Journal Issue: 8; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS