English

Reaction e^+e^-\to\pi^+\pi^-\pi^+\pi^- at energies \sqrt{s}\leq 1 GeV

High Energy Physics - Phenomenology 2009-02-19 v2 High Energy Physics - Experiment Nuclear Theory

Abstract

The cross section of reaction e^+e^-\to\pi^+\pi^-\pi^+\pi^- 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 \rho(1450) and \rho(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 \rho(770) one, and are amount to a considerable fraction \sim0.3-0.6 of the latter at \sqrt{s}\sim m_\rho.

Keywords

Cite

@article{arxiv.0803.2972,
  title  = {Reaction e^+e^-\to\pi^+\pi^-\pi^+\pi^- at energies \sqrt{s}\leq 1 GeV},
  author = {N. N. Achasov and A. A. Kozhevnikov},
  journal= {arXiv preprint arXiv:0803.2972},
  year   = {2009}
}

Comments

4 pages, 3 figures; considerably reduced in size