Precise extractions of the x and Q sup 2 dependence of R =. sigma. sub L /. sigma. sub T , F sub 2p , F sub 2d , and F sub 2n / sub 2p from a combined analysis of SLAC (Stanford Linear Accelerator Center) deep inelastic electron scattering experiments

Conference · Thu May 03 00:00:00 EDT 1990

OSTI ID:7134418

Whitlow, L W ^[1]; Rock, S ^[2]; Bodek, A; Dasu, S ^[3]; Riodan, E M ^[4]

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1. Stanford Univ., CA (USA)
2. American Univ., Washington, DC (USA)
3. Rochester Univ., NY (USA)
4. Stanford Linear Accelerator Center, Menlo Park, CA (USA)

We report on a precise study of the x and Q{sub 2} dependence of the proton, deuteron and neutron structure functions. In particular R = {sigma}{sub L}/{sigma}{sub T}, F{sub 2{sub p}}, F{sub 2{sub d}}, and the ratio F{sub 2{sub d}}/F{sub 2{sub p}} were extracted in a combined analysis of SLAC deep inelastic electron scattering experiments. Data from eight experiments were radiatively corrected with a new improved radiative correction formalism, and all experiments were normalized to the precise data of SLAC E140, thus yielding a single coherent data set. We find that R{sub p} = R{sub d} as expected from QCD. The results for R are somewhat larger than the prediction of QCD with target mass effects, thus indicating the existence of additional dynamic higher twist effects. Using both SLAC and CERN data, we obtained a parametrization of R in the range 0.5< Q{sup 2} <200 GeV/c{sup 2} and 0.1 < x < 0.86. This fit in conjunction with the normalized hydrogen and deuterium cross sections was used to extract precise values of F{sub 2}. These data provide a constraint at low Q{sup 2} for high Q{sup 2} muon and neutrino experiments. A study of the Q{sup 2} dependence of the ratio of deuteron and proton structure functions shows a slope which is consistent with QCD and explains the difference in this ratio between SLAC and CERN experiments. 7 figs.

• Research Organization: Rochester Univ., NY (USA). Dept. of Physics and Astronomy
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC02-76ER13065
• OSTI ID: 7134418
• Report Number(s): DOE/ER/13065-568; UR-1101; CONF-9003161-1; ON: DE90011013; TRN: 90-016728
• Resource Relation: Conference: 25. Rencontres de Moriond on QCD and hadronic interactions conference, Les Arcs (France), Mar 1990
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
DEUTERONS
STRUCTURE FUNCTIONS
NEUTRONS
PROTONS
CROSS SECTIONS
DEEP INELASTIC SCATTERING
ELECTRON REACTIONS
RADIATIVE CORRECTIONS
BARYONS
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
CORRECTIONS
ELEMENTARY PARTICLES
FERMIONS
FUNCTIONS
HADRONS
INELASTIC SCATTERING
INTERACTIONS
LEPTON REACTIONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
NUCLEAR REACTIONS
NUCLEONS
PARTICLE INTERACTIONS
SCATTERING
645204* - High Energy Physics- Particle Interactions &amp; Properties-Theoretical- Strong Interactions &amp; Properties