Why photoproduction of charmonium on nuclei does not measure the charmonium-nucleon total cross section

Journal Article · Mon Aug 24 04:00:00 EDT 1992 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.69.1156· OSTI ID:7274822

Benhar, O; Kopeliovich, B Z; Mariotti, C; Nikolaev, N N; Zakharov, B G ^[1]

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1. Department of Physics; University of Illinois at Urbana-Champaign; Urbana; Illinois 61801 (United States) Laboratory of Nuclear Physics; Joint Institute for Nuclear Research; Head Post Office; P. O. Box 79; 101000 Moscow (Russia) Istituto Nazionale di Fisica Nucleare Sezione Sanita; Physics Laboratory-Istituto Superiore di Sanita; viale Regina Elena 299; I-00161 Roma (Italy) Dipartimento di Fisica Teorica; Universita di Torino and Istituto Nazionale di Fisica Nucleare; Sezione di Torino; via P. Giuria; 1; I-10125 Torino (Italy) L. D. Landau Institute for Theoretical Physics; GSP-1; 117940; ul. Kosygina 2; V-334 Moscow (Russia) Nuclear Research Institute; High Energy Laboratory; Moscow State University; 177234 Moscow (Russia)

We show that color transparency produces either strong nuclear shadowing or antishadowing, depending on the specific (semi)exclusive photoproduction reaction off nuclei. Neither coherent nor quasielastic diffractive photoproduction of charmonium on nuclei measures the charmonium-nucleon total cross section and the vector-dominance-model interpretation of nuclear photoproduction data cannot be applied. We relate the {ital A} dependence of the coherent and quasielastic photoproduction cross sections and derive the energy dependence of shadowing. The results are in good agreement with the New Muon Collaboration data.

• OSTI ID: 7274822
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 69:8; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

663410* -- Photonuclear Reactions & Photon Scattering-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BASIC INTERACTIONS
BOSONS
CHARMONIUM
COLOR MODEL
COMPOSITE MODELS
CROSS SECTIONS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
FIELD THEORIES
HADRONS
INTERACTIONS
MATHEMATICAL MODELS
MESONS
PARAMETRIC ANALYSIS
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PHOTON-BARYON INTERACTIONS
PHOTON-HADRON INTERACTIONS
PHOTON-NUCLEON INTERACTIONS
PHOTOPRODUCTION
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK MODEL
QUARKONIUM
TOTAL CROSS SECTIONS
VECTOR DOMINANCE MODEL