Battaglieri, M.
Spin Dependent Structure Function
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Measurements of the Q**2 dependence of the proton and deuteron spin structure functions g1(p) and g1(d)

The E143 collaboration Abe, K. ; Akagi, T. ; Anthony, P.L. ; et al.
Phys.Lett.B 364 (1995) 61-68, 1995.
Inspire Record 401107 DOI 10.17182/hepdata.28431

The ratio g1/F1 has been measured over the range 0.031 (GeV/c)2. A trend is observed for g1/F1 to decrease at lower Q2. Fits to world data with and without a possible Q2-dependence in g1/F1 are in agreement with the Bjorken sum rule, but Delta_q is substantially less than the quark-parton model expectation.

16 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Measurement of the proton and deuteron spin structure function g2 and asymmetry A2.

The E143 collaboration Abe, K. ; Akagi, T. ; Anthony, P.L. ; et al.
Phys.Rev.Lett. 76 (1996) 587-591, 1996.
Inspire Record 400029 DOI 10.17182/hepdata.19584

We have measured proton and deuteron virtual photon-nucleon asymmetries A2p and A2d and structure functions g2p and g2d over the range 0.03

8 data tables
Table 1

Proton data measured in the 4.5 degree spectrometer.

Table 2

Proton data measured in the 7.0 degree spectrometer.

Table 3

Deuteron data measured in the 4.5 degree spectrometer.

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A New measurement of the spin dependent structure function g1(x) of the deuteron

The Spin Muon collaboration Adams, D. ; Adeva, B. ; Arik, E. ; et al.
Phys.Lett.B 357 (1995) 248-254, 1995.
Inspire Record 397392 DOI 10.17182/hepdata.47847

We present a new measurement of the spin-dependent structure function g 1 d of the deuteron in deep inelastic scattering of 190 GeV polarised muons on polarised deuterons, in the kinematic range 0.003 < x < 0.7 and 1 GeV 2 < Q 2 < 60 GeV 2 . This structure function is found to be negative at small x . The first moment Γ 1 d =∫ 0 1 g 1 d d x evaluated at Q 0 2 = 10 GeV 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 Γ 1 p , we obtain Γ 1 p − Γ 1 n = 0.199 ± 0.038 which agrees with the Bjorken sum rule.

4 data tables
Table 1

Results on the virtual photon deuteron asymmetry.

Table 2

Results on the spin structure function of the deuteron.

Table 3

Results on the spin structure function of the neutron.

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Precision measurement of the deuteron spin structure function g1(d)

The E143 collaboration Abe, K. ; Akagi, T. ; Anthony, P.L. ; et al.
Phys.Rev.Lett. 75 (1995) 25-28, 1995.
Inspire Record 393667 DOI 10.17182/hepdata.19611

We report on a high-statistics measurement of the deuteron spin structure function g1d at a beam energy of 29 GeV in the kinematic range 0.029

2 data tables
Table 1

No description provided.

Table 2

Values of G1 computed assuming G1/F1 is independent of Q**2 and evaluated at Q**2 = 3 GeV**2.


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

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.


Spin asymmetry in muon - proton deep inelastic scattering on a transversely polarized target

The Spin Muon (SMC) collaboration Adams, D. ; Adeva, B. ; Arik, E. ; et al.
Phys.Lett.B 336 (1994) 125-130, 1994.
Inspire Record 375478 DOI 10.17182/hepdata.48344

We measured the spin asymmetry in the scattering of 100 GeV longitudinally-polarized muons on transversely polarized protons. The asymmetry was found to be compatible with zero in the kinematic range $0.006

2 data tables
Table 1

No description provided.

Table 2

Nucleon spin structure function g2.


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

The Spin Muon (SMC) collaboration Adams, D. ; Adeva, B. ; Arik, E. ; et al.
Phys.Lett.B 329 (1994) 399-406, 1994.
Inspire Record 373036 DOI 10.17182/hepdata.48171

: We have measured the spin-dependent structure function $g_1~p$ of the proton in deep inelastic scattering of polarized muons off polarized protons, in the kinematic range $0.003

3 data tables
Table 1

Results on the virtual photon proton asymmetry.

Table 2

Results on the spin structure function of the proton.

Table 3

Data for g1 at fixed Q**2 = 10 GeV (assuming no Q**2 dependence of A1).


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.


Determination of the neutron spin structure function..

The E142 collaboration Anthony, P.L. ; Arnold, R.G. ; Band, H.R. ; et al.
Phys.Rev.Lett. 71 (1993) 959-962, 1993.
Inspire Record 359353 DOI 10.17182/hepdata.19693

The spin structure function of the neutron g1n has been determined over the range 0.03

2 data tables
Table 1

No description provided.

Table 2

Extrapolarity to full x range.


An investigation of the spin structure of the proton in deep inelastic scattering of polarized muons on polarized protons.

The European Muon collaboration Ashman, J. ; Badelek, B. ; Baum, Guenter ; et al.
Nucl.Phys.B 328 (1989) 1, 1989.
Inspire Record 280143 DOI 10.17182/hepdata.49587

The spin asymmetry in deep inelastic scattering of longitudinally polarised muons by longitudinally polarised protons has been measured in the range 0.01<×<0.7. The spin dependent structure function g 1 ( x ) for the proton has been determined and, combining the data with earlier SLAC measurements, its integral over x found to be 0.126±0.010(stat.)±0.015(syst.), in disagreement with the Ellis-Jaffe sum rule. Assuming the validity of the Biorken sum rule, this result implies a significant negative value for the integral of g 1 for the neutron. These integrals lead to the conclusion, in the naïve quark parton model, that the total quark spin constitutes a rather small fraction of the spin of the nucleon. Results are also presented on the asymmetries in inclusive hadron production which are consistent with the above picture.

7 data tables
Table 1

THE MEAN Q**2 FOR EACH OF THE 10 VALUES OF X BELOW ARE 3.5,4.5,6.0, 8.010.3,12.9,15.2,18.0,22.5,29.5.

Table 2

No description provided.

Table 3

No description provided.

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