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Title: | Observation of e+e− Annihilation into the C=+1 Hadronic Final States ρ0ρ0 and ϕρ0 |
Author: | Graugés Pous, Eugeni BABAR Collaboration |
Keywords: | Física de partícules Experiments Particle physics Experiments |
Issue Date: | 14-Sep-2006 |
Publisher: | American Physical Society |
Abstract: | We report the first observation of e + e − annihilation into states of positive C parity, namely, ρ 0 ρ 0 and ϕ ρ 0 . The two states are observed in the π + π − π + π − and K + K − π + π − 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 √ s = 10.58 GeV . The distributions of cos θ ∗ , where θ ∗ is the center-of-mass polar angle of the ϕ meson or the forward ρ 0 meson, suggest production by two-virtual-photon annihilation. We measure cross sections within the range | cos θ ∗ | < 0.8 of σ ( e + e − → ρ 0 ρ 0 ) = 20.7 ± 0.7 ( stat ) ± 2.7 ( syst ) fb and σ ( e + e − → ϕ ρ 0 ) = 5.7 ± 0.5 ( stat ) ± 0.8 ( syst ) fb . |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.97.112002 |
It is part of: | Physical Review Letters, 2006, vol. 97, num. 11, p. 112002 |
URI: | http://hdl.handle.net/2445/140439 |
Related resource: | https://doi.org/10.1103/PhysRevLett.97.112002 |
ISSN: | 0031-9007 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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