Engelien, H.
New Muon
Neutral Current
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The ratio F2(n) / F2(p) in deep inelastic muon scattering

The New Muon collaboration Amaudruz, P. ; Arneodo, M. ; Arvidson, A. ; et al.
Nucl.Phys.B 371 (1992) 3-31, 1992.
Inspire Record 321412 DOI 10.17182/hepdata.32955

Results are presented on the ratio of neutron and proton structure functions, F 2 n / F 2 p , deduced from deep inelastic scattering of muon from hydrogen and deuterium. The data, which were obtained at the CERN muon beam at 90 and 280 GeV incident energy, cover the kinematic range x = 0.002−0.80 and Q 2 = 0.1−190 GeV 2 . The measured structure function ratios have small statistical and systematic errors, particularly at small and intermediate x . The observed Q 2 dependence in the range x = 0.1−0.4 is stronger than predicted by perturbative QCD. From the present data together with results from other experiments it is suggested that the twist-four coefficient for the proton is smaller than that for the neutron for x larger than 0.2.

16 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

Merged 90 and 280 GeV data.

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Precision measurement of structure function ratios for Li-6, C-12 and Ca-40

The New Muon collaboration Amaudruz, P. ; Arneodo, M. ; Arvidson, A. ; et al.
Z.Phys.C 53 (1992) 73-78, 1992.
Inspire Record 319669 DOI 10.17182/hepdata.14706

The structure function ratiosF2C/F2Li,F2Ca/F2Li andF2Ca/F2C were measured in deep inelastic muonnucleus scattering at an incident muon energy of 90 GeV, covering the kinematic range 0.0085<x<0.6 and 0.8<Q2<17GeV2. The sensitivity of the nuclear structure functions to the size and mean density of the target nucleus is discussed.

3 data tables
Table 1

Overall normalization error of 0.7%, due to uncertainties in target thickness, not included in the table.

Table 2

Overall normalization error of 0.8%, due to uncertainties in target thickness, not included in the table.

Table 3

Overall normalization error of 0.5%, due to uncertainties in target thickness, not included in the table.


Precision measurement of the structure function ratios F2 (He) / F2 (D), F2 (C) / F2 (D) and F2 (Ca) / F2 (D)

The New Muon collaboration Amaudruz, P. ; Arneodo, M. ; Arvidson, A. ; et al.
Z.Phys.C 51 (1991) 387-394, 1991.
Inspire Record 314878 DOI 10.17182/hepdata.14935

We present the structure function ratiosF2He/F2D,F2C/F2D andF2Ca/F2D measured in deep inelastic muon-nucleus scattering at an incident muon momentum of 200 GeV. The kinematic range 0.0035<x<0.65 and 0.5<Q2<90 GeV2 is covered. At lowx the three ratios are significantly smaller than unity and the size of the depletion grows with decreasingx and increasing mass numberA. At intermediatex the ratios show an enhancement of about 2% above unity for C/D and Ca/D, possibly less for He/D. There are indications of someQ2 dependence in the Ca/D data. The integrals of the structure function differencesF2A−F2D are discussed.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


The Gottfried sum from the ratio F2(n) / F2(p)

The New Muon collaboration Amaudruz, P. ; Arneodo, M. ; Arvidson, A. ; et al.
Phys.Rev.Lett. 66 (1991) 2712-2715, 1991.
Inspire Record 313931 DOI 10.17182/hepdata.19908

Experimental results obtained at the CERN Super Proton Synchrotron on the structure-function ratio F2n/F2p in the kinematic range 0.004<x<0.8 and 0.4<Q2<190 GeV2, together with the structure function F2d determined from a fit to published data, are used to derive the difference F2p(x)-F2n(x). The value of the Gottfried sum F(F2p-F2n)dx/x=0.240±0.016 is below the quark-parton-model expectation of 1/3.

1 data table
Table 1

No description provided.