Details

Autor(en) / Beteiligte

• 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.

Titel

Measurement of the e+e− → π+π− process cross section with the SND detector at the VEPP-2000 collider in the energy region 0.525 <s< 0.883 GeV

Ist Teil von

• The journal of high energy physics, 2021-01, Vol.2021 (1)

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2021

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• 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.