Low-energy {omega} ({yields}{pi}{sup 0}{gamma}) meson photoproduction in the nucleus

Journal Article · Wed Jun 15 04:00:00 EDT 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.83.064608· OSTI ID:21502792

Das, Swapan ^[1]

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1. Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai 400085 (India)

The {pi}{sup 0{gamma}} invariant mass distribution spectra in the ({gamma},{pi}{sup 0{gamma}}) reaction were measured by the TAPS/ELSA Collaboration to look for the hadron parameters of the {omega} meson in the Nb nucleus. We study the mechanism for this reaction, where we consider that the elementary reaction in the Nb nucleus proceeds as {gamma}N{yields}{omega}N;{omega}{yields}{pi}{sup 0}{gamma}. The {omega}-meson photoproduction amplitude for this reaction is extracted from the measured four-momentum transfer distribution in the {gamma}p{yields}{omega}p reaction. The propagation of the {omega} meson and the distorted wave function for the {pi}{sup 0} meson in the final state are described by the eikonal form. The {omega} and {pi}{sup 0} mesons' nucleus optical potentials, appearing in the {omega} meson propagator and {pi}{sup 0} meson distorted wave function respectively, are estimated using the t{rho} approximation. The effects of pair correlation and color transparency are also studied. The calculated results do not show medium modification for the {omega} meson produced in the nucleus for momentum greater than 200 MeV. It occurs because the {omega} meson predominantly decays outside the nucleus. The dependence of the cross section on the final-state interaction is also investigated. The broadening of the {omega}-meson mass distribution spectra is shown to occur due to the large resolution width associated with the detector used in the experiment.

• OSTI ID: 21502792
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 83; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
APPROXIMATIONS
BARYONS
BASIC INTERACTIONS
BOSONS
CALCULATION METHODS
COLOR MODEL
COMPOSITE MODELS
CORRELATIONS
CROSS SECTIONS
DECAY
DISTORTED WAVE THEORY
DISTRIBUTION
EIKONAL APPROXIMATION
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FINAL-STATE INTERACTIONS
FOUR MOMENTUM TRANSFER
HADRONS
HYPERONS
INTERACTIONS
LINE BROADENING
MASS DISTRIBUTION
MATHEMATICAL MODELS
MESONS
MEV RANGE
MEV RANGE 100-1000
MOMENTUM TRANSFER
NUCLEI
OMEGA BARYONS
OPACITY
OPTICAL PROPERTIES
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PHOTOPRODUCTION
PHYSICAL PROPERTIES
PIONS
PIONS NEUTRAL
PSEUDOSCALAR MESONS
QUARK MODEL
RESOLUTION
SPATIAL DISTRIBUTION
SPECTRA
STRANGE PARTICLES