Investigation of color transparency by high transverse momentum pp elastic scattering inside nuclei
Conference
·
OSTI ID:6029818
Following a suggestion of Mueller and Brodsky, we have measured (p, 2p) quasielastic scattering in nuclei at 90(degree) CM at momentum transfers of Q/sup 2/ = 4.8, 8.5 and 10.4 (GeV/c)/sup 2/. In a perturbative QCD model of large transverse momentum exclusive reactions, the hadrons which scatter are anomalously ''small,'' and hence have a reduced absorption in nuclear matter over distances comparable to nuclear radii. At sufficiently high momentum, the absorption should vanish completely and lead to complete ''color transparency.'' The absorption of the initial and final state protons as they pass through nuclear matter is determined from the ratio of the differential cross section for elastic scattering from protons in nuclei to that from free protons. The kinematic constraints of the experiment allow a clear extraction of the (p,2p) quasielastic signal, and a good measurement of the target proton momentum spectrum as probed by large momentum transfers. In contrast to a conventional Glauber picture of constant transparency, a striking energy dependence is observed in this experiment. 11 refs., 4 figs.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 6029818
- Report Number(s):
- BNL-42856; CONF-8903143-3; ON: DE89015109
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
645100* -- High Energy Physics-- Particle Interactions & Properties-Experimental
651420 -- Nuclear Properties & Reactions
A=20-38
Experimental
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALUMINIUM 27 TARGET
BARYON REACTIONS
BARYON-BARYON INTERACTIONS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DIRECT REACTIONS
ELASTIC SCATTERING
HADRON REACTIONS
HADRON-HADRON INTERACTIONS
INTERACTIONS
LINEAR MOMENTUM
MATTER
MOMENTUM TRANSFER
NUCLEAR MATTER
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEON-NUCLEON INTERACTIONS
OPACITY
OPTICAL PROPERTIES
PARTICLE INTERACTIONS
PHYSICAL PROPERTIES
PROTON REACTIONS
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
QUASI-ELASTIC SCATTERING
QUASI-FREE REACTIONS
SCATTERING
TARGETS
TRANSVERSE MOMENTUM
651420 -- Nuclear Properties & Reactions
A=20-38
Experimental
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALUMINIUM 27 TARGET
BARYON REACTIONS
BARYON-BARYON INTERACTIONS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DIRECT REACTIONS
ELASTIC SCATTERING
HADRON REACTIONS
HADRON-HADRON INTERACTIONS
INTERACTIONS
LINEAR MOMENTUM
MATTER
MOMENTUM TRANSFER
NUCLEAR MATTER
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEON-NUCLEON INTERACTIONS
OPACITY
OPTICAL PROPERTIES
PARTICLE INTERACTIONS
PHYSICAL PROPERTIES
PROTON REACTIONS
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
QUASI-ELASTIC SCATTERING
QUASI-FREE REACTIONS
SCATTERING
TARGETS
TRANSVERSE MOMENTUM