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Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France.
Phys Rev Lett. 2006 Sep 15;97(11):112002. doi: 10.1103/PhysRevLett.97.112002. Epub 2006 Sep 14.
We report the first observation of e(+)e(-) annihilation into states of positive C parity, namely, rho(0)rho(0) and phirho(0). The two states are observed in the pi(+)pi(-)pi(+)pi(-) and K(+)K(-)pi(+)pi(-) final states, respectively, in a data sample of 225 fb(-1) collected by the BABAR experiment at the Positron-Electron Project II e(+)e(-) storage rings at energies near sqrt[s]=10.58 GeV. The distributions of costheta(), where theta() is the center-of-mass polar angle of the phi meson or the forward rho(0) meson, suggest production by two-virtual-photon annihilation. We measure cross sections within the range |costheta(*)|<0.8 of sigma(e(+)e(-)-->rho(0)rho(0))=20.7+/-0.7(stat)+/-2.7(syst) fb and sigma(e(+)e(-)-->phirho(0))=5.7+/-0.5(stat)+/-0.8(syst) fb.
我们报道了首次观测到正负电子湮灭到正C宇称态，即ρ(0)ρ(0)和φρ(0)。这两个态分别在π⁺π⁻π⁺π⁻和K⁺K⁻π⁺π⁻末态中被观测到，该数据样本是由BABAR实验在正电子 - 电子对撞机II（PEP-II）的正负电子储存环上收集的，能量接近√s = 10.58 GeV，数据量为225 fb⁻¹。其中，θ为φ介子或向前的ρ(0)介子的质心极角，cosθ的分布表明产生过程是通过双虚光子湮灭。我们测量了|cosθ*|<0.8范围内的截面，其中σ(e⁺e⁻→ρ(0)ρ(0)) = 20.7±0.7(统计)±2.7(系统) fb，σ(e⁺e⁻→φρ(0)) = 5.7±0.5(统计)±0.8(系统) fb。
