Intermediate dynamics of the four pions production in $e^+e^-$ annihilation and tau decay processes
June 10, 2020
In this article we print out preliminary results of an amplitude analysis of the $e^+e^-\to 4\pi$ process. The amplitude analysis is performed using experimental data from the CMD-3 detector at the VEPP-2000 collider in the energy range 0.9--2.007 GeV. In the study the dominance of the $e^+e^- \to \omega \pi^0 \to 4 \pi$ and $e^+e^- \to a_1(1260) \pi \to 4\pi$ amplitudes is proved, as well as sizable contributions of the $\rho^+\rho^-, \rho f_0(980), \rho \sigma$ and etc. states are observed. The obtained amplitude is used for the test of the isospin relations and hypothesis of conserved vector current (CVC).
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