TY - JOUR
T1 - Observation of $e^+ e^- \to \rho^ + \rho^ - $ near $\sqrt s $ 10.58-GeV
AU - Bailey, David
AU - Alwyn, Kim
AU - Barlow, Roger
AU - Chia, Yaw
AU - Edgar, Christina
AU - Lafferty, George
AU - West, Timothy
AU - Yi, Jong
AU - The BaBar Collaboration
PY - 2008
Y1 - 2008
N2 - We report the first observation of e+e−→ρ+ρ−, in a data sample of 379 fb−1 collected with the BABAR detector at the {PEP-II} e+e− storage ring at center-of-mass energies near s√=10.58GeV.Wemeasureacrosssectionof\sigma({e^+e^-\} \to \rho^+ \rho^-) = {19.5 \pm 1.6(stat) \pm 3.2(syst) fb}.Assumingproductionthroughsingle−photonannihilation,therearethreeindependenthelicityamplitudes.Wemeasuretheratiosoftheirsquaredmodulitobe|{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|{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.
AB - We report the first observation of e+e−→ρ+ρ−, in a data sample of 379 fb−1 collected with the BABAR detector at the {PEP-II} e+e− storage ring at center-of-mass energies near s√=10.58GeV.Wemeasureacrosssectionof\sigma({e^+e^-\} \to \rho^+ \rho^-) = {19.5 \pm 1.6(stat) \pm 3.2(syst) fb}.Assumingproductionthroughsingle−photonannihilation,therearethreeindependenthelicityamplitudes.Wemeasuretheratiosoftheirsquaredmodulitobe|{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|{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.
U2 - 10.1103/PhysRevD.78.071103
DO - 10.1103/PhysRevD.78.071103
M3 - Article
SN - 1550-7998
VL - D78
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
ER -