a_1(1260) dominance in the process e+e- \to 4πat energies 1.05--1.38 GeV

Details a_1(1260) dominance in the process e+e- \to 4πat energies 1.05--1.38 GeV a_1(1260) dominance in the process e+e- \to 4πat energies 1.05--1.38 GeV

1999-04-22

arxiv.org/abs/hep-ex/9904024v2

Phys.Lett.B466:392-402,1999

Physics

High Energy Physics

High Energy Physics - Experiment

31 pages, 13 figures, LaTex2e

Scientific paper

10.1016/S0370-2693(99)01080-1

First results of the study of the process e+e- \to 4\pi by the CMD-2 collaboration at VEPP-2M are presented for the energy range 1.05--1.38 GeV. Using an integrated luminosity of 5.8 pb^{-1}, energy dependence of the processes e+e- \to \pi^+\pi^- 2\pi^0 and e+e- \to 2\pi^+ 2\pi^- has been measured. Analysis of the differential distributions demonstrates the dominance of the a_1\pi and \omega\pi intermediate states. Upper limits for the contributions of other alternative mechanisms are also placed.

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