HEPData Search

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The Present status of the nucleon spin structure functions

The Spin Muon collaboration Horikawa, N. ;

Nucl.Phys.A 577 (1994) 313C-318C, 1994.

Inspire Record 386219 DOI 10.17182/hepdata.36532

SMC is progressing a series of experiments to reveal the spin structure of nucleon at CERN. The first experiment on deuteron has been performed in 1992. We will report here the data on deuteron and discuss the present status of nucleon spin structure using all data including SMC and also E142(SLAC) data recently reported.

1 data table

Table 1

First moment of the spin-dependent structure function G1.

Accurate measurement of F2(d)/F2(p) and R(d)-R(p).

The New Muon collaboration Arneodo, M. ; Arvidson, A. ; Badełek, B. ; et al.

Nucl.Phys.B 487 (1997) 3-26, 1997.

Inspire Record 426595 DOI 10.17182/hepdata.32750

Results are presented for F2d/F2p and Rd-Rp from simultaneous measurements of deep inelastic muon scattering on hydrogen and deuterium targets, at 90, 120, 200 and 280 GeV. The difference Rd-Rp, determined in the range 0.002<x<0.4 at an average Q^2 of 5 GeV^2, is compatible with zero. The x and Q^2 dependence of F2d/F2p was measured in the kinematic range 0.001<x<0.8 and 0.1<Q^2<145 GeV^2 with small statistical and systematic errors. For x>0.1 the ratio decreases with Q^2.

23 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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A Re-Evaluation of the nuclear Structure Function Ratios for D, He, Li, C and Ca

The New Muon collaboration Amaudruz, P. ; Arneodo, M. ; Arvidson, A. ; et al.

Nucl.Phys.B 441 (1995) 3-11, 1995.

Inspire Record 393377 DOI 10.17182/hepdata.32848

We present a re-evaluation of the structure function ratios F2(He)/F2(D), F2(C)/F2(D) and F2(Ca)/F2(D) measured in deep inelastic muon-nucleus scattering at an incident muon momentum of 200 GeV. We also present the ratios F2(C)/F2(Li), F2(Ca)/F2(Li) and F2(Ca)/F2(C) measured at 90 GeV. The results are based on data already published by NMC; the main difference in the analysis is a correction for the masses of the deuterium targets and an improvement in the radiative corrections. The kinematic range covered is 0.0035 < x < 0.65, 0.5 < Q^2 <90 GeV^2 for the He/D, C/D and Ca/D data and 0.0085 < x < 0.6, 0.84 < Q^2 < 17 GeV^2 for the Li/C/Ca ones.

6 data tables

Table 1

Additional normalization uncertainty of 0.4 pct not included.

Table 2

Additional normalization uncertainty of 0.4 pct not included.

Table 3

Additional normalization uncertainty of 0.4 pct not included.

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Measurements of the Nucleon Structure Function in the Range 0.002-GeV2 < x < 0.17-GeV2 and 0.2-GeV2 < q2 < 8-GeV**2 in Deuterium, Carbon and Calcium

The European Muon collaboration Arneodo, M. ; Arvidson, A. ; Aubert, J.J. ; et al.

Nucl.Phys.B 333 (1990) 1-47, 1990.

Inspire Record 283347 DOI 10.17182/hepdata.33074

Small angle scattering of 280 GeV positive muons by deuterium, carbon and calcium has been measured at scattering angles down to 2 mrad. The nucleon structure function F 2 extracted from deuterium does not show a significant x dependence in the measured range of Q 2 and its Q 2 dependence is linear in log Q 2 . For calcium, a depletion of F 2 is observed at low x by 30% as compared with the values at x = 0.1 where F 2 (Ca) and F 2 (D) are not significantly different. This depletion is attributed to shadowing. The carbon structure function exhibits a similar, but less pronounced, x dependence. Such behaviour is observed to be independent of Q 2 . The data are consistent with those obtained from other charged lepton experiments both at similar and higher values of x and Q 2 and considerably extend the range of the measurements down to the low values of x to be measured in forthcoming experiments at HERA.

33 data tables

Table 1

Deuterium data. Overall normalization error of 7 pct not included.

Table 2

Deuterium data. Overall normalization error of 7 pct not included.

Table 3

Deuterium data. Overall normalization error of 7 pct not included.

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Measurements of the Nucleon Structure Functions F(2)N in Deep Inelastic Muon Scattering from Deuterium and Comparison with Those from Hydrogen and Iron

The European Muon collaboration Aubert, J.J. ; Bassompierre, G. ; Becks, K.H. ; et al.

Nucl.Phys.B 293 (1987) 740-786, 1987.

Inspire Record 245537 DOI 10.17182/hepdata.33529

None

12 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Shadowing in the muon-xenon inelastic scattering cross-section at 490-GeV

The Fermilab E665 collaboration Adams, M.R. ; Aid, S. ; Anthony, P.L. ; et al.

Phys.Lett.B 287 (1992) 375-380, 1992.

Inspire Record 341389 DOI 10.17182/hepdata.29153

Inelastic scattering of 490 GeV μ + from deuterium and xenon nuclei has been studied for x Bj > s .001. The ratio of the xenon/deuterium cross section per nucleon is observed to vary with x Bj , with a depletion in the kinematic range 0.001 < x Bj < 0.025 which exhibits no significant Q 2 dependence. An electromagnetic calorimeter was used to verify the radiative corrections.

2 data tables

Table 1

Xenon structure function parameterized as being equal to the DEUT structurefunction.

Table 2

Xenon structure function parameterized by an x-dependent shadowing factor times the DEUT structure function.

Measurements of R(d) - R(p) and R(Ca) - R(C) in deep inelastic muon scattering

The New Muon collaboration Amaudruz, P. ; Arneodo, M. ; Arvidson, A. ; et al.

Phys.Lett.B 294 (1992) 120-126, 1992.

Inspire Record 340582 DOI 10.17182/hepdata.29038

Results are presented on the difference in R , the ratio of longitudinally to transversely polarised virtual photon absorption cross sections, for the deuteron and the proton. They are obtained by comparing the ratio of cross sections for the deep inelastic scattering of muons from deuterium and hydrogen targets at 90 and 280 GeV incident energy. The results cover the range x =0.01–0.30, at an average Q 2 of 9 GeV 2 . The measured difference R d - R p shows no significant x dependence and is compatible with zero, as well as with expectations from perturbative QCD. We use the same method to obtain the difference R Ca - R C from cross section ratios measured on carbon and calcium targets at 90 and 200 GeV incident energy.

4 data tables

Table 1

No description provided.

Table 2

Average overall x values.

Table 3

No description provided.

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The Ratio of the Nucleon Structure Functions f2 (n) for Iron and Deuterium

The European Muon collaboration Aubert, J.J. ; Bassompierre, G. ; Becks, K.H. ; et al.

Phys.Lett.B 123 (1983) 275-278, 1983.

Inspire Record 188925 DOI 10.17182/hepdata.30745

Using the data on deep inelastic muon scattering on iron and deuterium the ratio of the nucleon structure functions F 2 N ( Fe )/ F 2 N ( D ) is presented. The observed x -dependence of this ratio is in disagreement with existing theoretical predictions.

1 data table

Table 1

RANGE OF Q*2 VARIES WITH X. E.G. AT X=0.05 , 9<Q2<27. AT X=0.65 , 36<Q2<170 GEV**2.

MEASUREMENT OF THE DEUTERON STRUCTURE FUNCTION F2 AND A COMPARISON OF PROTON AND NEUTRON STRUCTURE

The European Muon collaboration Aubert, J.J. ; Bassompierre, G. ; Becks, K.H. ; et al.

Phys.Lett.B 123 (1983) 123-126, 1983.

Inspire Record 188737 DOI 10.17182/hepdata.30753

The deuteron structure function F 2 d has been measured in 280 GeV μ + d interactions. Existing measurements of F 2 p , made with the same apparatus, are used to calculate F 2 p − F 2 n and F 2 n F 2 p . The ratio F 2 n F 2 p has a similar x dependence to that of earlier measurements at lower Q 2 .

10 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.