literature
Literature
Authors
Jobs
Seminars
Conferences
DataBETA

Observation of e+e−→ρ+ρ−e^+ e^- \to \rho^{+} \rho^{-} near s\sqrt{s} = 10.58-GeV

Collaboration
Jun, 2008
8 pages
Published in:
  • Phys.Rev.D 78 (2008) 071103
e-Print:
DOI:
Report number:
  • SLAC-PUB-13230,
  • BABAR-PUB-08-018
Experiments:
View in:
pdflinks
reference search32 citations

Citations per year

20082012201620202024012345
Abstract: (arXiv)
We report the first observation of e+e−→ρ+ρ−e^+e^- \to \rho^+\rho^-, in a data sample of 379 fb−1fb^{-1} collected with the BABAR detector at the {PEP-II} e+e−e^+e^- storage ring at center-of-mass energies near s=10.58GeV.Wemeasureacrosssectionof\sqrt{s} = 10.58 GeV. We measure a cross section of \sigma({e^+e^-\} \to \rho^+ \rho^-) = {19.5 \pm 1.6(stat) \pm 3.2(syst) fb}.Assumingproductionthroughsingle−photonannihilation,therearethreeindependenthelicityamplitudes.Wemeasuretheratiosoftheirsquaredmodulitobe. Assuming production through single-photon annihilation, there are three independent helicity amplitudes. We measure the ratios of their squared moduli to be |{F}_{00}|^2 : |{F}_{10}|^2 : |{F}_{11}|^2 = 0.51 \pm 0.14(stat) \pm 0.07(syst) : 0.10 \pm 0.04(stat) \pm 0.01(syst) : 0.04 \pm 0.03(stat) \pm 0.01(syst).The. The |{F}_{00}|^2$ result is inconsistent with the prediction of 1.0 made by QCD models with a significance of 3.1 standard deviations including systematic uncertainties.
  • 14.40.Ev
  • 13.66.Bc
  • 13.25.-k
  • electron positron: colliding beams
  • electron positron: annihilation
  • rho(770): pair production
  • rho(770): hadronic decay
  • mass spectrum: (pi+ pi- 2pi0)
  • channel cross section
  • angular distribution
  • 1-25 of 30
  • 1
  • 2
  • 25 / page