A NEW MEASUREMENT OF THE SPIN-DEPENDENT STRUCTURE-FUNCTION G(1)(X) OFTHE DEUTERON
Citation
D. Adams et al., A NEW MEASUREMENT OF THE SPIN-DEPENDENT STRUCTURE-FUNCTION G(1)(X) OFTHE DEUTERON, Physics letters. Section B, 357(1-2), 1995, pp. 248-254
Categorie Soggetti
Physics
SICI code
0370-2693(1995)357:1-2<248:ANMOTS>2.0.ZU;2-Z
Abstract
We present a new measurement of the spin-dependent structure function
g(1)(d) of the deuteron in deep inelastic scattering of 190 GeV polari
sed muons on polarised deuterons, in the kinematic range 0.003<x<0.7 a
nd IGeV2,Q(2)<60GeV(2). This structure function is found to be negativ
e at small x. The first moment Gamma(1)(d)=integral(0)(1)g(1)(d)dx eva
luated at Q(0)(2)=10GeV(2) is 0.034+/-0.009(stat.)+/-0.006(syst). This
value is below the Ellis-Jaffe sum rule prediction by three standard
deviations. Using our earlier determination of Gamma(1)(p), we obtain
Gamma(1)(p)-Gamma(1)(n)=0.199+/-0.038 which agrees with the Bjorken su
m rule.