Author:
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.
Abstract
Abstract
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 <$$ \sqrt{s} $$
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 $$ \sqrt{s} $$
s
> 0.600 GeV. The ρ meson parameters are obtained as mρ = 775.3 ± 0.5 ± 0.6 MeV, Γρ = 145.6 ± 0.6 ± 0.8 MeV, Bρ→e+e− × Bρ→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 Bω→e+e− × Bω→π+π− = (1.32 ± 0.06 ± 0.02) × 10−6 and and ϕρω = 110.7 ± 1.5 ± 1.0 degrees.
Publisher
Springer Science and Business Media LLC
Subject
Nuclear and High Energy Physics
Reference51 articles.
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