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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 1999, vol. 466, p. 392-402

a1(1260)π dominance in the process e+e- → 4π at energies 1.05-1.38 GeV

Akhmetshin R. R., Anashkin E. V., Arpagaus M., Aulchenko V. M., Banzarov V. Sh, Barkov L. M., Bashtovoy N. S., Bondar A. E., Bondarev D. V., Bragin A. V., Chernyak D. V., Chertovskikh A. G., Dvoretsky A. S., Eidelman S. I., Fedotovitch G. V., Gabyshev N. I., Grebeniuk A. A., Grigoriev D. N., Ivanov P. M., Karpov S. V., Kazanin V. F., Khazin B. I., Koop I. A., Korostelev M. S., Krokovny P. P., Kurdadze L. M., Kuzmin A. S., Logashenko I. B., Lukin P. A., Lysenko A. P., Mikhailov K. Yu, Milstein A. I., Nesterenko I. N., Okhapkin V. S., Otboev A. V., Perevedentsev E. A., Polunin A. A., Popov A. S., Purlatz T. A., Root N. I., Ruban A. A., Ryskulov N. M., Shamov A. G., Shatunov Yu M., Shekhtman A. I., Shwartz B. A., Sibidanov A. L., Sidorov V. A., Skrinsky A. N., Smakhtin V. P., Snopkov I. G., Solodov E. P., Stepanov P. Yu, Sukhanov A. I., Titov V. M., Valishev A. A., Yudin Yu V., Zverev S. G., Thompson J. A., Hughes V. W.

The 5.8 pb-1 of data collected by the CMD-2 Collaboration in the energy range 1.05-1.38 GeV have been used to study energy dependence of the processes e+e- → π+π-2π0 and e+e- → 2π+2π-. Analysis of the differential distributions demonstrates the dominance of the a1(1260)π and ωπ intermediate states. Upper limits for the contributions of other possible states are also obtained. © 1999 Published by Elsevier Science B.V. All rights reserved.