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arXiv 0806.3893hep-ex
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e+e-> rho+rho-近sqrt（s）=10.58 GeV

Observation of e+e- --> rho+rho- near sqrt(s)=10.58 GeV

The BABAR Collaboration, B. Aubert

备注：
8 pages, 4 postscript figures, submitted to PRD-RC
发表信息：
Phys.Rev.D78:071103,2008
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摘要：

We report the first observation of $e^+e^- \to ρ^+ρ^-$ , 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 $\sqrt{s} = 10.58 GeV. We measure a cross section of $ σ({e^+e^-\} \to ρ^+ ρ^-) = {19.5 \pm 1.6(stat) \pm 3.2(syst) fb} $. 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 $ |{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.

英文摘要：

We report the first observation of $e^+e^- \to ρ^+ρ^-$, 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 $\sqrt{s} = 10.58 GeV. We measure a cross section of $σ({e^+e^-\} \to ρ^+ ρ^-) = {19.5 \pm 1.6(stat) \pm 3.2(syst) fb}$. 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 $|{F}_{00}|^2$ result is inconsistent with the prediction of 1.0 made by QCD models with a significance of 3.1 standard deviations including systematic uncertainties.

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