New results in rho^0 meson physics

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dc.creatorBenayoun, M.
dc.creatorEidelman, S.
dc.creatorMaltman, K.
dc.creatorO'Connell, H. B.
dc.creatorShwartz, B.
dc.creatorWilliams, A. G.
dc.date1997-07-29
dc.date1998-04-10
dc.date.accessioned2026-07-07T11:09:39Z
dc.date.available2026-07-07T11:09:39Z
dc.descriptionWe compare the predictions of a range of existing models based on the Vector Meson Dominance hypothesis with data on e^+ e^- -> pi^+ pi^$ and e^+ e^- -> mu^+ mu^- cross-sections and the phase and near-threshold behavior of the timelike pion form factor, with the aim of determining which (if any) of these models is capable of providing an accurate representation of the full range of experimental data. We find that, of the models considered, only that proposed by Bando et al. is able to consistently account for all information, provided one allows its parameter "a" to vary from the usual value of 2 to 2.4. Our fit with this model gives a point-like coupling (gamma pi^+ π^-) of magnitude ~ -e/6, while the common formulation of VMD excludes such a term. The resulting values for the rho mass and pi^+ pi^- and e^+e^- partial widths as well as the branching ratio for the decay omega -> pi^+ pi^- obtained within the context of this model are consistent with previous results.
dc.description34 pages with 7 figures. Published version also available at http://link.springer.de/link/service/journals/10052/tocs/t8002002.htm
dc.identifierhttps://arxiv.org/abs/hep-ph/9707509
dc.identifierhttp://arxiv.org/abs/hep-ph/9707509
dc.identifierEur.Phys.J.C2:269-286,1998
dc.identifierdoi:10.1007/s100520050137
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/190541
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectNuclear Theory
dc.titleNew results in rho^0 meson physics
dc.typetext

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