We report the observation of e+e-→ϕη near √s=10.58 GeV with 6.5σ significance in the K+K-γγ final state in a data sample of 224 fb-1 collected by the BABAR experiment at the PEP-II e+e- storage rings. We measure the restricted radiation-corrected cross section to be σ(e+e-→ϕη)=2.1±0.4(stat)±0.1(syst) fb within the range |cosθ*|<0.8, where θ* is the center-of-mass polar angle of the ϕ meson. The ϕ meson is required to be in the invariant mass range of 1.008<mϕ<1.035 GeV/c2. The radiation-corrected cross section in the full cosθ* range is extrapolated to be 2.9±0.5(stat)±0.1(syst) fb.
Observation of the exclusive reaction e+e-→ϕη at √s=10.58 GeV
SIMI, GABRIELE;GAZ A;MARGONI, MARTINO;SIMONETTO, FRANCO;STROILI, ROBERTO;VOCI, CESARE;
2006
Abstract
We report the observation of e+e-→ϕη near √s=10.58 GeV with 6.5σ significance in the K+K-γγ final state in a data sample of 224 fb-1 collected by the BABAR experiment at the PEP-II e+e- storage rings. We measure the restricted radiation-corrected cross section to be σ(e+e-→ϕη)=2.1±0.4(stat)±0.1(syst) fb within the range |cosθ*|<0.8, where θ* is the center-of-mass polar angle of the ϕ meson. The ϕ meson is required to be in the invariant mass range of 1.008File in questo prodotto:
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