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VOLUME 88 (2008) | ISSUE 1 | PAGE 3
Reaction e+e-→π+π-π+π- at energies \boldsymbol{\sqrt{s}\leq1 }GeV
PACS: 11.30.Rd, 12.39.Fe, 13.30.Eg
Abstract
The cross section of reaction e+e-→π+π-π+π- is calculated for energies 0.65\leq \sqrt{s}\leq1 GeV in the framework of the generalized hidden local symmetry model. The calculations are compared with the data of CMD-2 and BaBaR. It is shown that the inclusion of heavy isovector resonances ρ(1450) and ρ(1700) is necessary for reconciling calculations with the data. It is found that at \sqrt{s}\approx1 GeV the contributions of above resonances are much larger, by the factor of 30, than the ρ(770) one, and are amount to a considerable fraction \sim0.3{-}0.6 of the latter at \sqrt{s}\sim m_\rho.