Next-to-leading order determination of the singlet axial charge and the polarized gluon content of the nucleon

Ball, Richard D.; Forte, Stefano; Ridolfi, Giovanni

doi:10.1016/0370-2693(96)00376-0

Next-to-leading order determination of the singlet axial charge and the polarized gluon content of the nucleon

Richard D. Ball
(
- CERN and
- Edinburgh U.
)
,
Stefano Forte
(
- CERN
)
,
Giovanni Ridolfi
(
- Genoa U.
)

Oct, 1995

19 pages

Published in:

Phys.Lett.B 378 (1996) 255-266

e-Print:

hep-ph/9510449 [hep-ph]

DOI:

10.1016/0370-2693(96)00376-0

Report number:

CERN-TH-95-266,
EDINBURGH-95-556,
GEF-TH-9-95

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Abstract:

We perform a full next-to-leading analysis of the the available experimental data on the polarized structure function g_1 of the nucleon, and give a precise determination of its singlet axial charge together with a thorough assessment of the theoretical uncertainties. We find that the data are now sufficient to separately determine first moments of the polarized quark and gluon distributions, and show in particular that the gluon contribution is large and positive.

Note:

19 pages, TeX with harvmac and epsf, 4 figures in compressed postscript Report-no: CERN-TH/95-266, Edinburgh 95/556, GeF-TH-9/95

lepton nucleon: deep inelastic scattering
deep inelastic scattering: lepton nucleon
nucleon: structure function
deuteron: structure function
polarization
quantum chromodynamics
perturbation theory: higher-order
charge: axial
quark: momentum spectrum
gluon: momentum spectrum

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