PRECISION DETERMINATION OF THE NEUTRON SPIN STRUCTURE-FUNCTION G(1)(N)

Citation
K. Abe et al., PRECISION DETERMINATION OF THE NEUTRON SPIN STRUCTURE-FUNCTION G(1)(N), Physical review letters, 79(1), 1997, pp. 26-30
Citations number
46
Categorie Soggetti
Physics
Journal title
ISSN journal
00319007
Volume
79
Issue
1
Year of publication
1997
Pages
26 - 30
Database
ISI
SICI code
0031-9007(1997)79:1<26:PDOTNS>2.0.ZU;2-G
Abstract
We report on a precision measurement of the neutron spin structure fun ction g(l)(n) using deep inelastic scattering of polarized electrons b y polarized He-3. For the kinematic range 0.014 < x < 0.7 and 1 < Q(2) < 17 (GeV/c)(2), we obtain integral(0.014)(0.7) g(l)(n)(x)dx = -0.036 +/- 0.004(stat) +/- 0.005(syst) at an average Q(2) = 5 (GeV/c)(2). We find relatively large negative values for g(l)(n) at low x. The resul ts call into question the usual Regge theory method for extrapolating to x = 0 to find the full neutron integral integral(0)(1) g(l)(n)(x)dx , needed for testing the quark-parton model and QCD sum rules.