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- W2100748551 abstract "Experiments soon to be performed, such as Coulomb dissociation of hadrons and ${e}^{ifmmodepmelsetextpmfi{}}{e}^{ensuremath{-}}ensuremath{rightarrow}{e}^{ifmmodepmelsetextpmfi{}}{e}^{ensuremath{-}}+mathrm{hadrons}$, will be able to measure radiative decays of mesons with ${J}^{mathrm{PC}}={2}^{++}, {1}^{++}, {0}^{++}, mathrm{and} {1}^{+ensuremath{-}}$. In advance of these experiments, predictions are made for rates and angular distributions in such processes as ${A}_{1,2}ensuremath{rightarrow}ensuremath{pi}ensuremath{gamma}$, ${f}_{0}ensuremath{rightarrow}ensuremath{rho}ensuremath{gamma}$, and ${f}_{0}ensuremath{rightarrow}ensuremath{gamma}ensuremath{gamma}$. These predictions are based only on vector dominance and single-quark selection rules, but will permit the first tests of such hypotheses for excited mesons. Results include: (a) relatively large partial widths for ${f}_{0}ensuremath{rightarrow}ensuremath{gamma}ensuremath{rho}$ and ${f}_{0}ensuremath{rightarrow}ensuremath{gamma}ensuremath{gamma}$: $ensuremath{Gamma}({f}_{0}ensuremath{rightarrow}ensuremath{gamma}ensuremath{rho})ensuremath{simeq}1.5$ MeV and $ensuremath{Gamma}({f}_{0}ensuremath{rightarrow}ensuremath{gamma}ensuremath{gamma})ensuremath{simeq}8$ keV; (b) the suppression of $ensuremath{lambda}=0, ifmmodepmelsetextpmfi{}1$ decays relative to $ensuremath{lambda}=ifmmodepmelsetextpmfi{}2$ for these processes; (c) relative phases for helicity amplitudes in these processes, implying definite angular distributions in $ensuremath{gamma}ensuremath{gamma}ensuremath{rightarrow}{f}_{0}ensuremath{rightarrow}ensuremath{pi}ensuremath{pi}$ and ${f}_{0}ensuremath{rightarrow}ensuremath{gamma}ensuremath{rho}ensuremath{rightarrow}ensuremath{gamma}{ensuremath{pi}}^{+}{ensuremath{pi}}^{ensuremath{-}}$; and (d) the nearly complete suppression of $ensuremath{gamma}ensuremath{gamma}$ couplings of ${0}^{++}$ $qoverline{q}$ states." @default.
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- W2100748551 date "1976-09-01" @default.
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- W2100748551 title "Radiative transitions of low-lying positive-parity mesons" @default.
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- W2100748551 doi "https://doi.org/10.1103/physrevd.14.1286" @default.
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