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Type: Journal article
Title: New results in ρ⁰ meson physics
Other Titles: New results in rho(0) meson physics
Author: Benayoun, M.
Eidelman, S.
Maltman, K.
O'Connell, H.
Schwartx, B.
Williams, A.
Citation: European Physical Journal C: Particles and Fields, 1998; 2(2):269-286
Publisher: Springer
Issue Date: 1998
ISSN: 1434-6044
Statement of
M. Benayoun, S. Eidelman, K. Maltman, H.B. O'Connell, B. Shwartz, A.G. Williams
Abstract: We compare the predictions of a range of existing models based on the Vector Meson Dominance hypothesis with data on e+e- → π+π- and e+e- → μ+μ- 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 γπ+π- of magnitude ≃ -e/6, while the common formulation of VMD excludes such a term. The resulting values for the ρ mass and π+π- and e+e- partial widths as well as the branching ratio for the decay w → π+π- obtained within the context of this model are consistent with previous results.
Rights: © Springer-Verlag 1998
DOI: 10.1007/PL00021575
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Appears in Collections:Aurora harvest 2
Special Research Centre for the Subatomic Structure of Matter publications

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