Abstract
The cross section of the process e+e−→ ηπ+π− is measured using the data collected with the CMD-3 detector at the VEPP-2000 collider in the center-of-mass energy range from 1.1 to 2.0 GeV. The decay mode η → γγ is used for η meson reconstruction in the data sample corresponding to an integrated luminosity of 78.3 pb−1. The energy dependence of the e+e−→ ηπ+π− cross section is fitted within the framework of vector meson dominance in order to extract the Γ(ρ(1450) → e+e−)\( \mathcal{B} \)(ρ(1450) → ηπ+π−) and the Γ(ρ(1700) → e+e−)\( \mathcal{B} \)(ρ(1700) → ηπ+π−) products. Based on conservation of vector current, the analyzed data are used to test the relationship between the e+e−→ ηπ+π− cross section and the spectral function in τ−→ ηπ−π0ντ decay. The e+e−→ ηπ+π− cross section obtained with the CMD-3 detector is in good agreement with the previous measurements.
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CMD-3 collaboration., Gribanov, S.S., Popov, A.S. et al. Measurement of the e+e−→ ηπ+π− cross section with the CMD-3 detector at the VEPP-2000 collider. J. High Energ. Phys. 2020, 112 (2020). https://doi.org/10.1007/JHEP01(2020)112
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DOI: https://doi.org/10.1007/JHEP01(2020)112