The In-medium Mass and Widths of Light Vector Mesons

Journal Article · Mon May 23 04:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3575098· OSTI ID:21516948

Djalali, C; Paolone, M ^[1]; Weygand, D ^[2]; Wood, M H ^[3]; Nasseripour, R ^[4]

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1. University of South Carolina, Department of Physics and Astronomy, Columbia, SC 29208 (United States)
2. Thomas Jefferson National Accelerator Facility, Newport News, VA 23606 (United States)
3. Canisius College, Department of Physics, Buffalo, NY 14208 (United States)
4. George Washington University, Department of Physics, Washington, DC 20052 (United States)

Partial restoration of chiral symmetry in ordinary nuclear matter suggests the modification of properties of vector mesons, such as a shift in mass and/or a change of width. Photoproduction of vector mesons off nuclei were performed at Jefferson Lab using the CEBAF Large Acceptance Spectrometer (CLAS). The properties of the {rho}, {omega} and {phi} mesons were investigated via their rare leptonic decay to e+e-. This decay channel has an advantage over hadronic modes as it eliminates final state interactions in the nuclear matter. After subtracting the combinatorial background, the meson mass distributions were extracted for each of the nuclear targets. No significant mass shift is observed, however substantial increase in the widths of the mesons is reported.

• OSTI ID: 21516948
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1343; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
BASIC INTERACTIONS
BOSONS
CEBAF ACCELERATOR
CHIRAL SYMMETRY
DECAY
DISTRIBUTION
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
FIELD THEORIES
FINAL-STATE INTERACTIONS
GLUONS
HADRONS
INTERACTIONS
LEPTONIC DECAY
LINEAR ACCELERATORS
MASS
MASS DISTRIBUTION
MEASURING INSTRUMENTS
MESONS
MODIFICATIONS
NUCLEI
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHI MESONS
PHOTOPRODUCTION
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
SPATIAL DISTRIBUTION
SPECTROMETERS
SYMMETRY
VECTOR MESONS
WEAK INTERACTIONS
WEAK PARTICLE DECAY