The ratio F2(n) / F2(p) in deep inelastic muon scattering

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.

muon p: deep inelastic scattering
deep inelastic scattering: muon p
muon deuteron: deep inelastic scattering
deep inelastic scattering: muon deuteron
n: structure function
p: structure function
structure function: ratio
structure function: x-dependence
dependence: momentum transfer
effect: higher-twist

References(33)

Figures(0)

Asymptotic Freedom in Deep Inelastic Processes in the Leading Order and Beyond

Andrzej J. Buras
(
- Fermilab
)

- Rev.Mod.Phys. 52 (1980) 199,
- Ames Wkshp.1978:634
•
DOI:
- 10.1103/RevModPhys.52.199

Evolution of Parton Densities Beyond Leading Order: The Nonsinglet Case

- Nucl.Phys.B 175 (1980) 27-92
•
DOI:
- 10.1016/0550-3213(80)90003-6

Singlet Parton Densities Beyond Leading Order

W. Furmanski
(
- Jagiellonian U.
)
,
R. Petronzio
(
- CERN
)

- Phys.Lett.B 97 (1980) 437-442
•
DOI:
- 10.1016/0370-2693(80)90636-X

Twist Four in the QCD Analysis of Leptoproduction

R.L. Jaffe
(
- MIT, LNS
)
,
M. Soldate
(
- MIT, LNS
)

- Phys.Lett.B 105 (1981) 467-472
•
DOI:
- 10.1016/0370-2693(81)91206-5

Twist Four Corrections to Charged and Neutral Current Neutrino Scattering

P. Castorina
(
- MIT, LNS
)
,
P.J. Mulders
(
- MIT, LNS
)

- Phys.Rev.D 31 (1985) 2753
•
DOI:
- 10.1103/PhysRevD.31.2753

Measurements of the nucleon structure functions $F2_n$ in deep inelastic muon scattering from deuterium and comparison with those from hydrogen and iron

European Muon

Collaboration

•

J.J. Aubert
(
- Unlisted, FR
)

et al.

- Nucl.Phys.B 293 (1987) 740-786
•
DOI:
- 10.1016/0550-3213(87)90090-3

Electron Scattering at 4-Degrees with Energies of 4.5-GeV - 20-GeV

et al.

- Phys.Rev.D 12 (1975) 1884
•
DOI:
- 10.1103/PhysRevD.12.1884

Experimental Studies of the Neutron and Proton Electromagnetic Structure Functions

et al.

- Phys.Rev.D 20 (1979) 1471-1552
•
DOI:
- 10.1103/PhysRevD.20.1471

The Ratio $\sigma^-$ l / $\sigma^-$ t From Deep Inelastic Electron Scattering

et al.

- Phys.Rev.D 27 (1983) 285
•
DOI:
- 10.1103/PhysRevD.27.285

A Comparison of the Structure Functions F2 of the Proton and the Neutron From Deep Inelastic Muon Scattering at High $Q^2$

BCDMS

Collaboration

•

A.C. Benvenuti
(
- Bologna U. and
- INFN, Bologna
)

et al.

- Phys.Lett.B 237 (1990) 599-604
•
DOI:
- 10.1016/0370-2693(90)91232-Z

Measurement of the neutron and the proton F2 structure function ratio

New Muon (NMC)

Collaboration

•

D. Allasia
(
- INFN, Turin and
- Turin U.
)

et al.

- Phys.Lett.B 249 (1990) 366-372
•
DOI:
- 10.1016/0370-2693(90)91270-L

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

New Muon

Collaboration

•

P. Amaudruz

et al.

- Phys.Rev.Lett. 66 (1991) 2712-2715
•
DOI:
- 10.1103/PhysRevLett.66.2712

A Precise extraction of R = sigma-L / sigma-T from a global analysis of the SLAC deep inelastic e p and e d scattering cross-sections

L.W. Whitlow
(
- Stanford U., Phys. Dept.
)
,
Stephen Rock
(
- American U.
)
,
A. Bodek
(
- Rochester U.
)
,
E.M. Riordan
(
- SLAC
)
,
S. Dasu
(
- SLAC
)

- Phys.Lett.B 250 (1990) 193-198
•
DOI:
- 10.1016/0370-2693(90)91176-C

A Large Magnetic Spectrometer System for High-Energy Muon Physics

European Muon

Collaboration

•

O.C. Allkofer
(
- Unlisted, DE
)

et al.

- Nucl.Instrum.Meth. 179 (1981) 445-466
•
DOI:
- 10.1016/0029-554X(81)90169-5

The Vertex and Large Angle Detectors of a Spectrometer System for High-energy Muon Physics

European Muon

Collaboration

•

J.P. Albanese

et al.

- Nucl.Instrum.Meth. 212 (1983) 111
•
DOI:
- 10.1016/0167-5087(83)90682-8

A Detailed Study of the Proton Structure Functions in Deep Inelastic Muon - Proton Scattering

European Muon

Collaboration

•

J.J. Aubert
(
- Unlisted, FR
)

et al.

- Nucl.Phys.B 259 (1985) 189,
- Nucl. Phys. B259 ( 1985) 189-265 and CERN Geneva - CERN-EP 85-034 (85,REC.APR.) 111p
•
DOI:
- 10.1016/0550-3213(85)90635-2