Abstract
The cross section of the process e + e − → π+π− was measured in the spherical neutral detector experiment at the VEPP-2M collider in the energy region \(400 < \sqrt s < 1000 MeV\). This measurement was based on about 12.4 × 106 selected collinear events, which include 7.4 × 106 e + e − → e + e −, 4.5 × 106 e + e − → π+π−, and 0.5 × 106 e + e − → μ+μ− selected events. The systematic uncertainty of cross section determination is 1.3%. The ρ-meson parameters were determined as m ρ = 774.9±0.4±0.5 MeV, Γ ρ = 146.5±0.8±1.5 MeV, and σ(ρ → π+π−) = 1220 ± 7 ± 16 nb and the parameters of the G-parity suppressed decay ω → π+π− as σ(ω → π+π−) = 29.9 ± 1.4 ± 1.0 nb and φρω = 113.5±1.3±1.7°.
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From Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Fiziki, Vol. 128, No. 6, 2005, pp. 1201–1219.
Original English Text Copyright © 2005 by Achasov, Beloborodov, Berdyugin, Bogdanchikov, Bozhenok, A. Bukin, D. Bukin, Dimova, Druzhinin, Golubev, Koop, Korol, Koshuba, Lysenko, Otboev, Pakhtusova, Serednyakov, Shatunov, Sidorov, Silagadze, Skrinsky, Tikhonov, Vasiljev.
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Achasov, M.N., Beloborodov, K.I., Berdyugin, A.V. et al. Study of the process e + e − → π+π− in the energy region \(400 < \sqrt s < 1000 MeV^\P \) . J. Exp. Theor. Phys. 101, 1053–1070 (2005). https://doi.org/10.1134/1.2163921
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DOI: https://doi.org/10.1134/1.2163921