Measurement of the e+e- -> pi+pi- cross section with the CMD-2 detector in the 370-520 MeV c.m. energy range
R.R.Akhmetshin, V.M.Aulchenko, V.Sh.Banzarov, L.M.Barkov,, N.S.Bashtovoy, A.E.Bondar, D.V.Bondarev, A.V.Bragin, S.K.Dhawan,, S.I.Eidelman, D.A.Epifanov, G.V.Fedotovich, N.I.Gabyshev, D.A.Gorbachev,, A.A.Grebenuk, D.N.Grigoriev, V.W.Hughes, F.V.Ignatov, S.V.Karpov,, V.F.Kazanin
TL;DR
This paper reports precise measurements of the e+e- -> pi+pi- cross section in the 370-520 MeV range using the CMD-2 detector, enabling improved calculations of the pion electromagnetic radius and muon pair production cross section.
Contribution
First precise measurement of the e+e- -> pi+pi- cross section in this energy range with a systematic uncertainty of 0.7%, contributing to better understanding of pion structure.
Findings
Calculated pion electromagnetic radius from the data.
Determined the cross section for muon pair production.
Achieved high measurement precision with systematic uncertainties.
Abstract
The cross section of the process e+e- -> pi+pi- has been measured at the CMD-2 detector in the 370-520 MeV center-of-mass (c.m.) energy range. A systematic uncertainty of the measurement is 0.7 %. Using all CMD-2 data on the pion form factor, the pion electromagnetic radius was calculated. The cross section of muon pair production was also determined.
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