Zhou, Chen
Spin Dependent Structure Function
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Precision measurement of the proton spin structure function g1(p).

The E143 collaboration Abe, K. ; Akagi, T. ; Anthony, P.L. ; et al.
Phys.Rev.Lett. 74 (1995) 346-350, 1995.
Inspire Record 375737 DOI 10.17182/hepdata.19665

We have measured the ratio g1pF1p over the range 0.029<x<0.8 and 1.3<Q2<10 (GeV/c)2 using deep-inelastic scattering of polarized electrons from polarized ammonia. An evaluation of the integral ∫01g1p(x, Q2)dx at fixed Q2=3 (GeV/c)2 yields 0.127±0.004(stat)±0.010(syst), in agreement with previous experiments, but well below the Ellis-Jaffe sum rule prediction of 0.160±0.006. In the quark-parton model, this implies Δq=0.27±0.10.

2 data tables
Table 1

No description provided.

Table 2

Values of G1 computed assuming G1/F1 is independent of Q**2 and using a fixed Q**2 of 3 GeV**2.


Measurement of the spin dependent structure function g1(x) of the deuteron.

The Spin Muon collaboration Adeva, B. ; Ahmad, S. ; Arvidson, A. ; et al.
Phys.Lett.B 302 (1993) 533-539, 1993.
Inspire Record 354911 DOI 10.17182/hepdata.28926

We report on the first measurement of the spin-dependent structure function g 1 d of the deuteron in the deep inelastic scattering of polarised muons off polarised deuterons, in the kinematical range 0.006< x <0.6, 1 GeV 2 < Q 2 <30 GeV 2 . The first moment, Γ 1 d =ʃ 0 1 g 1 d d x=0.023±0.020 ( stat. ) ± 0.015 ( syst. ) , is smaller than the prediction of the Ellis-Jaffe sum rules. Using earlier measurements of g 1 p , we infer the first moment of the spin-dependent neutron structure function g 1 n . The difference Γ 1 p − Γ 1 n =0.20±0.05 (stat.) ± 0.04 (syst.) agrees with the prediction of the Bjorken sum rule, Γ 1 p − Γ 1 n =0.191±0.002.

2 data tables
Table 1

Virtual photon asymmetry A1.

Table 2

Spin-dependent structure function G1.