Vector Meson Photoproduction on Nuclei

Journal Article · Mon Oct 24 04:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3647099· OSTI ID:21608466

Djalali, Chaden ^[1]

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1. Department of Physics and Astronomy, University of South Carolina, 712 Main Street, Columbia, SC 29208 (United States)

Chiral symmetry, which is spontaneously broken in vacuum, is predicted to be partially restored in ordinary nuclear matter. The properties of vector mesons, such as their masses and/or widths are expected to change in the medium. The photoproduction reaction off nuclei is a very clean way of producing the {rho}, {omega} and {phi} mesons, and detect them via their hadronic or leptonic decays. The leptonic decay to e{sup +}e{sup -} has a small branching ratio but has the advantage of being free from final state interactions. One critical aspect in all these experiments is the correct determination of the shape and magnitude of the combinatorial background. The in-medium mass distributions and yields are compared to those measured in vacuum. No significant shift is observed in the masses of the mesons, however substantial increase in their widths is reported.

• OSTI ID: 21608466
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1374; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BASIC INTERACTIONS
BOSONS
BRANCHING RATIO
CHIRAL SYMMETRY
DECAY
DIMENSIONLESS NUMBERS
DISTRIBUTION
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
FINAL-STATE INTERACTIONS
HADRONS
INTERACTIONS
LEPTONIC DECAY
LEPTONS
MASS
MASS DISTRIBUTION
MATTER
MESONS
NUCLEAR MATTER
NUCLEAR REACTION YIELD
OMEGA-782 MESONS
PARTICLE DECAY
PHI MESONS
PHI-1020 MESONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
REST MASS
RHO-770 MESONS
SPATIAL DISTRIBUTION
SYMMETRY
VECTOR MESONS
WEAK INTERACTIONS
WEAK PARTICLE DECAY
YIELDS