Measurement of the $e^+e^-\toπ^+π^-$ cross section from threshold to 1.2 GeV with the CMD-3 detector
hep-ex
/ Authors
CMD-3 Collaboration, :, F. V. Ignatov, R. R. Akhmetshin, A. N. Amirkhanov, A. V. Anisenkov, V. M. Aulchenko, N. S. Bashtovoy, D. E. Berkaev, A. E. Bondar
and 59 more authors
A. V. Bragin, S. I. Eidelman, D. A. Epifanov, L. B. Epshteyn, A. L. Erofeev, G. V. Fedotovich, A. O. Gorkovenko, F. J. Grancagnolo, A. A. Grebenuk, S. S. Gribanov, D. N. Grigoriev, V. L. Ivanov, S. V. Karpov, A. S. Kasaev, V. F. Kazanin, B. I. Khazin, A. N. Kirpotin, I. A. Koop, A. A. Korobov, A. N. Kozyrev, E. A. Kozyrev, P. P. Krokovny, A. E. Kuzmenko
/ Abstract
The cross section of the process $e^+e^-\toπ^+π^-$ has been measured in the center of mass energy range from 0.32 to 1.2 GeV with the CMD-3 detector at the electron-positron collider VEPP-2000. The measurement is based on a full dataset collected below 1 GeV during three data taking seasons, corresponding to an integrated luminosity of about 62 pb$^{-1}$. In the dominant $ρ$-resonance region, a systematic uncertainty of 0.7% has been reached. At energies around $φ$-resonance the $π^+π^-$ production cross section was measured for the first time with high beam energy resolution. The forward-backward charge asymmetry in the $π^+π^-$ production has also been measured. It shows a strong deviation from the theoretical prediction based on the conventional scalar quantum electrodynamics framework, and it is in good agreement with the generalized vector-meson-dominance and dispersive-based predictions. The impact of the presented results on the evaluation of the hadronic contribution to the anomalous magnetic moment of muon is discussed.