Vector meson photoproduction studied in its radiative decay channel

We provide an analysis of vector meson photoproduction in the channel of the vector meson decaying into a pseudoscalar meson plus a photon (i.e., V{yields}P{gamma}). It is shown that nontrivial kinematic correlations arise from the measurement of the P{gamma} angular distributions in the overall c.m...

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Bibliographic Details
Published in:Physical review. C, Nuclear physics Nuclear physics, 2005-05, Vol.71 (5), Article 054004
Main Authors: Zhao, Qiang, Al-Khalili, J. S., Cole, P. L.
Format: Article
Language:English
Subjects:
ANGULAR DISTRIBUTION
ASYMMETRY
BRANCHING RATIO
COMPARATIVE EVALUATIONS
CORRELATIONS
DENSITY MATRIX
ETA MESONS
HADRONIC PARTICLE DECAY
K-892 MESONS
KAONS
NUCLEAR REACTION KINETICS
OMEGA-782 MESONS
PHOTONS
PHOTOPRODUCTION
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PIONS NEUTRAL
POLARIZATION
POLARIZED BEAMS
RADIATIVE DECAY
RHO-770 MESONS
SPIN
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Summary:We provide an analysis of vector meson photoproduction in the channel of the vector meson decaying into a pseudoscalar meson plus a photon (i.e., V{yields}P{gamma}). It is shown that nontrivial kinematic correlations arise from the measurement of the P{gamma} angular distributions in the overall c.m. system in comparison with those in the vector meson rest frame. The implication of such kinematic correlations in the measurement of polarization observables is discussed in terms of the vector meson density matrix elements. For {omega} meson production, because of its relatively large branching ratios for {omega}{yields}{pi}{sup 0}{gamma}, additional events from this channel may enrich the information about the reaction mechanism and improve the statistics of the recent measurement of polarized beam asymmetries by the GRAAL Collaboration. For {phi}{yields}{eta}{gamma},{rho}{yields}{pi}{gamma}, and K{sup *}{yields}K{gamma}, we expect that additional information about the spin structure of the vector meson production vertex can be derived.
ISSN:0556-2813
1089-490X
DOI:10.1103/PhysRevC.71.054004