Total Cross Section of the Process e+e- -> pi+pi-pi+pi- in the C.M.Energy Range 980-1380 MeV
R. R. Akhmetshin, et al. (CMD-2 Collaboration)
TL;DR
This paper reports a precise measurement of the e+e- -> pi+pi-pi+pi- cross section in the 980-1380 MeV energy range, improving accuracy through refined analysis techniques and increased data sample.
Contribution
It provides the first detailed measurement of the cross section in this energy range with reduced systematic errors.
Findings
Cross section measured with 5-7% systematic error
Data sample doubled compared to previous measurements
Refined analysis method improved accuracy
Abstract
The e+e- -> pi+pi-pi+pi- cross section has been measured using 5.8/pb of integrated luminosity collected with the CMD-2 detector at the VEPP-2M collider. Analysis of the data with a refined efficiency determination and use of both three- and four-track events allowed doubling of a data sample and reduction of systematic errors to 5-7%.
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