Date

A Reevaluation of the Gottfried sum

The New Muon collaboration Arneodo, M. ; Arvidson, A. ; Badelek, B. ; et al.
Phys.Rev. D50 (1994) R1-R3, 1994.
Inspire Record 358419 DOI 10.17182/hepdata.71293
4 data tables

Errors of F2(D) are the estimated total uncertainties and those on the ratio and difference are statistical only.

Values of the Gottfried Sum Rule integral (GS) defined as the integral between X(C=MIN) and X = 0.8 of (F2(P)-F2(N))DX/X.

No description provided.

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Flavour Separation of Helicity Distributions from Deep Inelastic Muon-Deuteron Scattering

The COMPASS collaboration Alekseev, M. ; Alexakhin, V.Yu. ; Alexandrov, Yu. ; et al.
Phys.Lett. B680 (2009) 217-224, 2009.
Inspire Record 820721 DOI 10.17182/hepdata.55300
4 data tables

Inclusive asymmetry as a function of X.

Charged pion and kaon semi-inclusive asymmetries as functions of X.

Correlations coefficients of the unfolded asymmetries.

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The Deuteron Spin-dependent Structure Function g1(d) and its First Moment

The COMPASS collaboration Alexakhin, V.Yu. ; Alexandrov, Yu. ; Alexeev, G.D. ; et al.
Phys.Lett. B647 (2007) 8-17, 2007.
Inspire Record 726688 DOI 10.17182/hepdata.48555

We present a measurement of the deuteron spin-dependent structure function g1d based on the data collected by the COMPASS experiment at CERN during the years 2002-2004. The data provide an accurate evaluation for Gamma_1^d, the first moment of g1d(x), and for the matrix element of the singlet axial current, a0. The results of QCD fits in the next to leading order (NLO) on all g1 deep inelastic scattering data are also presented. They provide two solutions with the gluon spin distribution function Delta G positive or negative, which describe the data equally well. In both cases, at Q^2 = 3 (GeV/c)^2 the first moment of Delta G is found to be of the order of 0.2 - 0.3 in absolute value.

1 data table

Measured values of A1 and G1 at mean values of X, Q**2.. For the first two data points the minimum Q**2 cut was reduced from 1 to 0.7 GeV**2.


Spin asymmetry A1(d) and the spin-dependent structure function g1(d) of the deuteron at low values of x and Q**2

The Compass collaboration Ageev, E.S. ; Alexakhin, V.Yu. ; Alexandrov, Yu. ; et al.
Phys.Lett. B647 (2007) 330-340, 2007.
Inspire Record 742118 DOI 10.17182/hepdata.48534

We present a precise measurement of the deuteron longitudinal spin asymmetry A_1^d and of the deuteron spin-dependent structure function g_1^d at Q^2 < 1 GeV^2 and 4*10^-5 < x < 2.5*10^-2 based on the data collected by the COMPASS experiment at CERN during the years 2002 and 2003. The statistical precision is tenfold better than that of the previous measurement in this region. The measured A_1^d and g_1^d are found to be consistent with zero in the whole range of x.

1 data table

Measured values of A1 and G1 at mean values of X, Q**2 and Y.


Measurement of the spin structure of the deuteron in the DIS region

The COMPASS collaboration Ageev, E.S. ; Alexakhin, V.Yu. ; Alexandrov, Yu. ; et al.
Phys.Lett. B612 (2005) 154-164, 2005.
Inspire Record 675838 DOI 10.17182/hepdata.48552

We present a new measurement of the longitudinal spin asymmetry A_1^d and the spin-dependent structure function g_1^d of the deuteron in the range 1 GeV^2 < Q^2 < 100 GeV^2 and 0.004< x <0.7. The data were obtained by the COMPASS experiment at CERN using a 160 GeV polarised muon beam and a large polarised 6-LiD target. The results are in agreement with those from previous experiments and improve considerably the statistical accuracy in the region 0.004 < x < 0.03.

13 data tables

Measured values of A1 as a function of Q**2 at a mean X value of 0.0051.

Measured values of A1 as a function of Q**2 at a mean X value of 0.0079.

Measured values of A1 as a function of Q**2 at a mean X value of 0.0141.

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Spin asymmetries A(1) and structure functions g1 of the proton and the deuteron from polarized high-energy muon scattering

The Spin Muon collaboration Adeva, B. ; Akdogan, T. ; Arik, E. ; et al.
Phys.Rev. D58 (1998) 112001, 1998.
Inspire Record 471981 DOI 10.17182/hepdata.49492
12 data tables

The virtual photon proton asymmetries.

The virtual photon deuteron asymmetries.

The virtual photon proton asymmetries in smaller X and Q**2 bins. bins. Errors are statistical only.

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A Next-to-leading order QCD analysis of the spin structure function g(1)

The Spin Muon collaboration Adeva, B. ; Akdogan, T. ; Arik, E. ; et al.
Phys.Rev. D58 (1998) 112002, 1998.
Inspire Record 471982 DOI 10.17182/hepdata.49415
7 data tables

The second systematic (DSYS) error is due to QCD evolution.

First moments of the fitted function G1 evaluated on unmeasured X regions. Total uncertainties due to experimental systematics and theoretical sourc es in the QCD evolution.

First moment of fitted G1 evaluated on the whole X region.

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The Spin dependent structure function g1(x) of the deuteron from polarized deep inelastic muon scattering

The Spin Muon (SMC) collaboration Adams, D. ; Adeva, B. ; Akdogan, T. ; et al.
Phys.Lett. B396 (1997) 338-348, 1997.
Inspire Record 440053 DOI 10.17182/hepdata.47513
6 data tables

Measurements of the transverse virtual photon asymmetry A2. Statistical errors only.

The virtual-photon deuteron cross section asymmetry A1 from the combined SMC data. Statistical errors only.

The spin dependent structure function G1(D).

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Spin structure of the proton from polarized inclusive deep inelastic muon - proton scattering

The Spin Muon (SMC) collaboration Adams, D. ; Adeva, B. ; Arik, E. ; et al.
Phys.Rev. D56 (1997) 5330-5358, 1997.
Inspire Record 440355 DOI 10.17182/hepdata.47485

We have measured the spin-dependent structure function $g_1~p$ in inclusive deep-inelastic scattering of polarized muons off polarized protons, in the kinematic range $0.003 < x < 0.7$ and $1 GeV~2 < Q~2 < 60 GeV~2$. A next-to-leading order QCD analysis is used to evolve the measured $g_1~p(x,Q~2)$ to a fixed $Q~2_0$. The first moment of $g_1~p$ at $Q~2_0 = 10 GeV~2$ is $\Gamma~p = 0.136\pm 0.013(stat.) \pm 0.009(syst.)\pm 0.005(evol.)$. This result is below the prediction of the Ellis-Jaffe sum rule by more than two standard deviations. The singlet axial charge $a_0$ is found to be $0.28 \pm 0.16$. In the Adler-Bardeen factorization scheme, $\Delta g \simeq 2$ is required to bring $\Delta \Sigma$ in agreement with the Quark-Parton Model. A combined analysis of all available proton and deuteron data confirms the Bjorken sum rule.

11 data tables

Data for Q**2 > 1 GeV**2.

Data for Q**2 > 0.2 GeV**2.

Statistical errors only.

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

The New Muon collaboration Arneodo, M. ; Arvidson, A. ; Badelek, B. ; et al.
Nucl.Phys. B487 (1997) 3-26, 1997.
Inspire Record 426595 DOI 10.17182/hepdata.32750
23 data tables

No description provided.

No description provided.

No description provided.

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Measurement of the proton and the deuteron structure functions, F2(p) and F2(d)

The New Muon collaboration Arneodo, M. ; Arvidson, A. ; Badelek, B. ; et al.
Phys.Lett. B364 (1995) 107-115, 1995.
Inspire Record 400018 DOI 10.17182/hepdata.48061

The proton and deuteron structure functions F2p and F2d were measured in the kinematic range 0.006<x<0.6 and 0.5<Q~2<75 GeV~2, by inclusive deep inelastic muon scattering at 90, 120, 200 and 280 GeV. The measurements are in good agreement with earlier high precision results. The present and earlier results together have been parametrised to give descriptions of the proton and deuteron structure functions F2 and their uncertainties over the range 0.006<x<0.9.

30 data tables

No description provided.

No description provided.

No description provided.

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Proton and deuteron structure functions in muon scattering at 470-GeV

The E665 collaboration Adams, M.R. ; Aid, S. ; Anthony, P.L. ; et al.
Phys.Rev. D54 (1996) 3006-3056, 1996.
Inspire Record 416076 DOI 10.17182/hepdata.42347
34 data tables

No description provided.

No description provided.

No description provided.

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Shadowing in inelastic scattering of muons on carbon, calcium and lead at low x(Bj)

The E665 collaboration Adams, M.R. ; Aid, S. ; Anthony, P.L. ; et al.
Z.Phys. C67 (1995) 403-410, 1995.
Inspire Record 394981 DOI 10.17182/hepdata.41664

Nuclear shadowing is observed in the per-nucleon cross-sections of positive muons on carbon, calcium and lead as compared to deuterium. The data were taken by Fermilab experiment E665 using inelastically scattered muons of mean incident momentum 470 GeV/c. Cross-section ratios are presented in the kinematic region 0.0001 < XBj <0.56 and 0.1 < Q**2 < 80 GeVc. The data are consistent with no significant nu or Q**2 dependence at fixed XBj. As XBj decreases, the size of the shadowing effect, as well as its A dependence, are found to approach the corresponding measurements in photoproduction.

4 data tables

Per-nucleon cross section ratio for carbon to deuterium.

Per-nucleon cross section ratio for calcium to deuterium.

Per-nucleon cross section ratio for lead to deuterium.

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The Present status of the nucleon spin structure functions

The Spin Muon collaboration Horikawa, N. ;
Nucl.Phys. A577 (1994) 313C-318C, 1994.
Inspire Record 386219 DOI 10.17182/hepdata.36532
1 data table

First moment of the spin-dependent structure function G1.


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. B357 (1995) 248-254, 1995.
Inspire Record 397392 DOI 10.17182/hepdata.47847
4 data tables

Results on the virtual photon deuteron asymmetry.

Results on the spin structure function of the deuteron.

Results on the spin structure function of the neutron.

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A Reevaluation of the nuclear structure function ratios for D, He, Li-6, C and Ca

The New Muon collaboration Amaudruz, P. ; Arneodo, M. ; Arvidson, A. ; et al.
Nucl.Phys. B441 (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

Additional normalization uncertainty of 0.4 pct not included.

Additional normalization uncertainty of 0.4 pct not included.

Additional normalization uncertainty of 0.4 pct not included.

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The Structure Function ratios F2(li) / F2(D) and F2(C) / F2(D) at small x

The New Muon collaboration Arneodo, M. ; Arvidson, A. ; Badelek, B. ; et al.
Nucl.Phys. B441 (1995) 12-30, 1995.
Inspire Record 394050 DOI 10.17182/hepdata.47955

We present the structure function ratios F2(Li)/F2(D) and F2(C)/F2(D) measured in deep inelastic muon-nucleus scattering at a nominal incident muon energy of 200 GeV. The kinematic range 0.0001 < x < 0.7 and 0.01< Q~2 < 70 GeV~2 is covered. For values of $x$ less than $0.002$ both ratios indicate saturation of shadowing at values compatible with photoabsorption results.

2 data tables

Additional normalization error of 0.004 not included.

Data on F2(C)/F2(DEUT) merged with previous NMC data from Amaudruz et al. 1995, NP B441,3. (<a href=http://durpdg.dur.ac.uk/scripts/reacsearch.csh/TESTREAC/red+3106> RED = 3106 </a>). Additional normalization error of 0.004 not included.


Extraction of the ratio $F2_n / F2_p$ from muon - deuteron and muon - proton scattering at small $x$ and Q**2

The E665 collaboration Adams, M.R. ; Aid, S. ; Anthony, P.L. ; et al.
Phys.Rev.Lett. 75 (1995) 1466-1470, 1995.
Inspire Record 393866 DOI 10.17182/hepdata.42379
2 data tables

F2(N) / F2(P) = 2F2(DEUT)/F2(P) - 1.

F2(N) / F2(P) = 2F2(DEUT)/F2(P) - 1. The systematic uncertainty in the Q**2 dependece is negligible as compared to the statistical uncertainty.


Measurement of the ratio $\sigma_n / \sigma_p$ in inelastic muon - nucleon scattering at very low $x$ and $Q^2$

The E665 collaboration Adams, M.R. ; Aid, S. ; Anthony, P.L. ; et al.
Phys.Lett. B309 (1993) 477-482, 1993.
Inspire Record 354238 DOI 10.17182/hepdata.28907
2 data tables

No description provided.

No description provided.


Saturation of shadowing at very low $x_{\rm BJ}$

The E665 collaboration Adams, M.R. ; Aid, S. ; Anthony, P.L. ; et al.
Phys.Rev.Lett. 68 (1992) 3266-3269, 1992.
Inspire Record 333894 DOI 10.17182/hepdata.19864
2 data tables

Data using Electromagnetic Cuts.

Data using Hadron Requirement.


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. B287 (1992) 375-380, 1992.
Inspire Record 341389 DOI 10.17182/hepdata.29153
2 data tables

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

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


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. B302 (1993) 533-539, 1993.
Inspire Record 354911 DOI 10.17182/hepdata.28926
2 data tables

Virtual photon asymmetry A1.

Spin-dependent structure function G1.


A Measurement of the ratio of the nucleon structure function in copper and deuterium

The European Muon collaboration Ashman, J. ; Badelek, B. ; Baum, Guenter ; et al.
Z.Phys. C57 (1993) 211-218, 1993.
Inspire Record 341575 DOI 10.17182/hepdata.14499
3 data tables

Results from the 'chariot' experiment.

Results from the 'addendum' experiment.

Merged 'chariot' and 'addendum' ratio.. Errors are combined statistics and systematics.


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. B294 (1992) 120-126, 1992.
Inspire Record 340582 DOI 10.17182/hepdata.29038
4 data tables

No description provided.

Average overall x values.

No description provided.

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Proton and deuteron f2 structure functions in deep inelastic muon scattering

The New Muon collaboration Amaudruz, P. ; Arneodo, M. ; Arvidson, A. ; et al.
Phys.Lett. B295 (1992) 159-168, 1992.
Inspire Record 338074 DOI 10.17182/hepdata.29003
60 data tables

No description provided.

No description provided.

No description provided.

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