793 research outputs found
Recent results from e+ e- --> hadrons
New results on the low energy e+ e- annihilation into hadrons from
Novosibirsk and Beijing are described. Implications of the new measurements for
the evaluation of the hadronic contribution to the muon anomalous magnetic
moment are discussed.Comment: Invited talk at the Seventh International Workshop on Tau Lepton
Physics (TAU02), Santa Cruz, Ca, USA, Sept 2002, 7 pages, 4 figure
Pion Form Factor Phase, PIon Pion Elasticity and New Electron-Positron Data
New precise data on the low energy electron-positron annihilation into
hadrons from Novosibirsk are used to obtain bounds on the elasticity parameter
and the difference between the phase of the pion form factor and that of pion
pion scatteringComment: 9 pages, 4 figures, submitted to Physics Letters
Four-pion production
Starting from the low-energy structure derived from QCD, we extend the
amplitudes for four-pion production in e+ e- annihilation and tau decays up to
invariant four-pion masses of 1 GeV. Cross sections and branching ratios
BR(rho^0 -> 4 pi) are compared with available data.Comment: 4 pages, 3 figures, contribution to Proc. of QCD'02, Montpellier,
July 2002, misprints correcte
Measurement of (1020) meson leptonic width with CMD-2 detector at VEPP-2M Collider
The (1020) meson leptonic width has been determined from the combined
analysis of 4 major decay modes of the resonance () studied with the CMD-2 detector at
the VEPP-2M collider. The following value has been obtained:
keV.
The meson parameters in four main decay channels have been also
recalculated: , , , .Comment: 14 pages, 3 figure
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