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Measurement of e+e- -> pi+pi- cross section with CMD-2 around rho(770) meson

High Energy Physics - Experiment 2007-05-23 v1

Abstract

In experiments with the CMD-2 detector at the VEPP-2M electron-positron collider at Novosibirsk about 150000 e+eπ+πe^+e^-\to\pi^+\pi^- events were recorded in the center-of-mass energy range from 0.61 up to 0.96 GeV. The result of the pion form factor measurement with a 1.4% systematic error is presented. The following values of the ρ\rho-meson and ρω\rho-\omega interference parameters were found: Mρ=(775.28±0.61±0.20)MeV,Γρ=(147.70±1.29±0.40)MeV,Γ(ρe+e)=(6.93±0.11±0.10)keV,Br(ωπ+π)=(1.32±0.23)M_\rho=(775.28\pm 0.61\pm 0.20) MeV, \Gamma_\rho=(147.70\pm 1.29 \pm 0.40) MeV, \Gamma(\rho\to e^+e^-)=(6.93\pm 0.11\pm 0.10) keV, Br(\omega\to\pi^+\pi^-) = (1.32\pm 0.23)%.

Keywords

Cite

@article{arxiv.hep-ex/9904027,
  title  = {Measurement of e+e- -> pi+pi- cross section with CMD-2 around rho(770) meson},
  author = {2 collaboration},
  journal= {arXiv preprint arXiv:hep-ex/9904027},
  year   = {2007}
}

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52 pages