Eur. Phys. J. A (2008) 38: 61-69
https://doi.org/10.1140/epja/i2008-10654-x

Regular Article - Theoretical Physics

Hidden local symmetry and the reaction e⁺e^- → at energies ⩽ 1 GeV

¹ S. L. Sobolev Institute for Mathematics, Laboratory of Theoretical Physics, 630090, Novosibirsk, Russian Federation
² Novosibirsk State University, 630090, Novosibirsk, Russian Federation

^* e-mail: kozhev@math.nsc.ru

Received: 3 June 2008
Accepted: 19 September 2008
Published online: 15 October 2008

Abstract

Based on the generalized hidden local symmetry as the chiral model of pseudoscalar, vector, and axial vector mesons, the excitation curve of the reaction e ⁺ e ^- → is calculated for energies in the interval 0.65 ⩽ ⩽ 1 GeV. The theoretical predictions are compared to available 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 ≈ 1 GeV the contributions of the above resonances are much larger, by a factor of 30, than the ρ(770) one, and amount to a considerable fraction ∼ 0.3-0.6 of the latter at ∼ m _ρ .