Measurement of e+e- -> pi+pi- cross section with CMD-2 around rho(770) meson

1999/04/26 by 2 collaboration, 2 Collaboration
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.48550/arxiv.hep-ex/9904027

52 pages

arxiv created 1999/04/26 · openalex publication_date 1999/04/26 · arxiv updated 2009/11/30 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28

Abstract

In experiments with the CMD-2 detector at the VEPP-2M electron-positron collider at Novosibirsk about 150000 e⁺e^-→π⁺π^- events were recorded in the center-of-mass energy range from 0.61 up to 0.96 GeV. The result of the pion form factor measurement with a 1.4% systematic error is presented. The following values of the ρ-meson and ρ-ω interference parameters were found: M_ρ=(775.28± 0.61± 0.20) MeV, Γ_ρ=(147.70± 1.29 ± 0.40) MeV, Γ(ρ→ e⁺e^-)=(6.93± 0.11± 0.10) keV, Br(ω→π⁺π^-) = (1.32± 0.23)%.

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