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A Global Treatment Of VMD Physics Up To The $\phi$: I. $e^+e^-$ Annihilations, Anomalies And Vector Meson Partial Widths

Abstract : The HLS Model, equipped with a mechanism providing the breaking of U(3)/SU(3) symmetry and an isospin symmetry breaking leading naturally to vector meson mixing, has been recently shown to successfully account for $e^+ e^- \ra \pi^+\pi^-$ cross section and for the dipion spectrum in $\tau$ decay. The present study shows that the full anomalous sector of the HLS model can be considered and is validated by the experimental data. Indeed, this extended model provides a successful simultaneous fit to the $e^+ e^- \ra \pi^+\pi^-$ data together with the available data on $e^+ e^- \ra \pi^0\gamma$, $e^+ e^- \ra \eta\gamma$ and $e^+ e^- \ra \pi^0 \pi^+\pi^-$ cross sections. It is shown that the fit of these data sets also predicts an accurate description of the $\eta/\eta^\prime \ra \pi^+ \pi^- \gamma$ decays fully consistent with the reported information on their branching fractions and spectra. Finally, one also derives from our global fits products of widths of the form $\Gamma (V \ra f_1)\Gamma(V \ra e^+ e^-) $ and ratios of the form $\Gamma (V \ra f_1)/\Gamma (V \ra f_2)$ describing decays of vector mesons to several non--leptonic final states.
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http://hal.in2p3.fr/in2p3-00448449
Contributor : Swarna Bassava <>
Submitted on : Tuesday, January 19, 2010 - 9:20:28 AM
Last modification on : Friday, April 16, 2021 - 9:07:01 AM

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M. Benayoun, P. David, L. Delbuono, O. Leitner. A Global Treatment Of VMD Physics Up To The $\phi$: I. $e^+e^-$ Annihilations, Anomalies And Vector Meson Partial Widths. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2010, 65, pp.211. ⟨10.1140/epjc/s10052-009-1197-6⟩. ⟨in2p3-00448449⟩

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