Uncertainties in determining parton distributions at large x

Accardi, A.; Melnitchouk, W.; Owens, J.F.; Christy, M.E.; Keppel, C.E.; Zhu, L.; Morfin, J.G.

doi:10.1103/PhysRevD.84.014008

Uncertainties in determining parton distributions at large x

A. Accardi
(
- Hampton U. and
- Jefferson Lab
)
,
W. Melnitchouk
(
- Jefferson Lab
)
,
J.F. Owens
(
- Florida State U.
)
,
M.E. Christy
(
- Hampton U.
)
,
C.E. Keppel
(
- Hampton U.
)

Feb, 2011

37 pages

Published in:

Phys.Rev.D 84 (2011) 014008

e-Print:

1102.3686 [hep-ph]

DOI:

10.1103/PhysRevD.84.014008

Report number:

JLAB-THY-11-1312,
FERMILAB-PUB-11-909-T

View in:

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Abstract: (arXiv)

We critically examine uncertainties in parton distribution functions (PDFs) at large x arising from nuclear effects in deuterium F2 structure function data. Within a global PDF analysis, we assess the impact on the PDFs from uncertainties in the deuteron wave function at short distances and nucleon off-shell effects, the use of relativistic kinematics, as well as the use of less a restrictive parametrization of the d/u ratio. We find that in particular the d-quark and gluon PDFs vary significantly with the choice of nuclear model. We highlight the impact of these uncertainties on the determination of the neutron structure function, and on W boson production and parton luminosity at the Tevatron and the LHC. Finally, we discuss prospects for new measurements sensitive to the d-quark and gluon distributions but insensitive to nuclear corrections.

24.85.+p
12.38.-t
parton: distribution function
kinematics: relativistic
deuteron: wave function
n: structure function
effect: off-shell
nuclear physics: effect
Batavia TEVATRON Coll
CERN LHC Coll

References(75)

Figures(15)

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