Measurement of kinematic and nuclear dependence of R=σL/σT in deep inelastic electron scattering
Creators
- Dasu, S.1
- de Barbaro, P.1
- Bodek, A.1
- Harada, H.1
- Krasny, M.W.1
- Lang, K.1
- Riordan, E.M.1
- Andivahis, L.2
- Arnold, R.2
- Benton, D.2
- Bosted, P.2
- deChambrier, G.2
- Lung, A.2
- Rock, S.E.2
- Szalata, Z.M.2
- Walker, R.C.3
- Filippone, B.W.3
- Jourdan, J.3
- Milner, R.3
- McKeown, R.3
- Potterveld, D.3
- Para, A.4
- Dietrich, F.5
- Van Bibber, K.5
- Button-Shafer, J.6
- Debebe, B.6
- Hicks, R.S.6
- Gearhart, R.7
- Whitlow, L.W.7
- Alster, J.8
- 1. University of Rochester, Rochester, New York 14627 (United States)
- 2. The American University, Washington, D.C. 20016 (United States)
- 3. California Institute of Technology, Pasadena, California 91125 (United States)
- 4. Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States)
- 5. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
- 6. University of Massachusetts, Amherst, Massachusetts 01003 (United States)
- 7. Stanford Linear Accelerator Center, Stanford, California 94305 (United States)
- 8. University of Tel-Aviv, Ramat Aviv, Tel-Aviv 69978 (Israel)
Description
We report results on a precision measurement of the ratio R=σL/σT in deep inelastic electron-nucleon scattering in the kinematic range 0.2≤x≤0.5 and 1≤Q2≤10 (GeV/c)2. Our results show, for the first time, a clear falloff of R with increasing Q2. Our R results are in agreement with QCD predictions only when corrections for target mass effects and some additional higher twist effects are included. At small x, the data on R favor structure functions with a large gluon contribution. We also report results on the differences RA-RD and the cross section ratio σA/σD between Fe and Au nuclei and the deuteron. Our results for RA-RD are consistent with zero for all x,Q2 indicating that possible contributions to R from nuclear higher twist effects and spin-0 constituents in nuclei are not different from those in nucleons. The ratios σA/σD from all recent experiments, at all x,Q2 values, are now in agreement
Additional details
Publishing Information
- Journal Title
- Physical Review. D, Particles Fields
- Journal Volume
- 49
- Journal Issue
- 11
- Journal Page Range
- p. 5641-5670.
- ISSN
- 0556-2821
- CODEN
- PRVDAQ
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 25059997
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; S73: NUCLEAR PHYSICS AND RADIATION PHYSICS;
- Descriptors DEI
- CROSS SECTIONS; DEEP INELASTIC SCATTERING; DEUTERONS; ELECTRON-NUCLEON INTERACTIONS; EMC EFFECT; GLUONS; GOLD; IRON; MASS; QUANTUM CHROMODYNAMICS; STRUCTURE FUNCTIONS
- Descriptors DEC
- BOSONS; CHARGED PARTICLES; ELEMENTARY PARTICLES; ELEMENTS; FIELD THEORIES; FUNCTIONS; INELASTIC SCATTERING; INTERACTIONS; LEPTON-BARYON INTERACTIONS; LEPTON-HADRON INTERACTIONS; LEPTON-NUCLEON INTERACTIONS; METALS; PARTICLE INTERACTIONS; POSTULATED PARTICLES; QUANTUM FIELD THEORY; SCATTERING; TRANSITION ELEMENTS