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Achasov, M. N.; Baykov, A. A.; Barnyakov, A. Yu; Beloborodov, K. I.; Berdyugin, A. V.; Berkaev, D. E.; Bogdanchikov, A. G.; Botov, A. A.; Dimova, T. V.; Druzhinin, V. P.; Golubev, V. B.; Kardapoltsev, L. V.; Kharlamov, A. G.; Koop, I. A.; Korol, A. A.; Kovrizhin, D. P.; Kupich, A. S.; Lysenko, A. P.; Martin, K. A.; Melnikova, N. A.; Muchnoi, N. Yu; Obrazovsky, A. E.; Pakhtusova, E. V.; Perevedentsev, E. A.; Pugachev, K. V.; Savchenko, Y. S.; Serednyakov, S. I.; Silagadze, Z. K.; Shatunov, P. Yu; Shatunov, Yu. M.; Shtol, D. A.; Shwartz, D. B.; Surin, I. K.; Usov, Yu. V.; Zemlyansky, I. M.; Zhabin, V. N.
The journal of high energy physics, 01/2021, Volume: 2021, Issue: 1Journal Article
A bstract The cross section of the process e + e − → π + π − has been measured in the Spherical Neutral Detector (SND) experiment at the VEPP-2000 e + e − collider VEPP-2000 in the energy region 525 < s < 883 MeV. The measurement is based on data with an integrated luminosity of about 4.6 pb − 1 . The systematic uncertainty of the cross section determination is 0.8% at s > 0 . 600 GeV. The ρ meson parameters are obtained as m ρ = 775 . 3 ± 0 . 5 ± 0 . 6 MeV, Γ ρ = 145 . 6 ± 0 . 6 ± 0 . 8 MeV, B ρ → e + e− × B ρ → π + π− = (4 . 89 ± 0 . 02 ± 0 . 04) × 10 − 5 , and the parameters of the e + e − → ω → π + π − process, suppressed by G -parity, as B ω → e + e− × B ω → π + π− = (1 . 32 ± 0 . 06 ± 0 . 02) × 10 − 6 and and ϕ ρω = 110 . 7 ± 1 . 5 ± 1 . 0 degrees.
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