Study of dynamics of the process e+e-→ π+π-π in the energy range 1.15–2.00 GeV: SND Collaboration

M. N. Achasov, A. Yu Barnyakov, A. A. Baykov, K. I. Beloborodov, A. V. Berdyugin, D. E. Berkaev, A. G. Bogdanchikov, A. A. Botov, T. V. Dimova, V. P. Druzhinin, V. B. Golubev, A. N. Kirpotin, L. V. Kardapoltsev, A. S. Kasaev, A. G. Kharlamov, I. A. Koop, A. A. Korol, D. P. Kovrizhin, A. S. Kupich, K. A. MartinN. A. Melnikova, N. Yu Muchnoy, A. E. Obrazovsky, E. V. Pakhtusova, K. V. Pugachev, D. V. Rabusov, Yu A. Rogovsky, Y. S. Savchenko, A. I. Senchenko, S. I. Serednyakov, D. N. Shatilov, Yu M. Shatunov, D. A. Shtol, D. B. Shwartz, Z. K. Silagadze, I. K. Surin, M. V. Timoshenko, Yu V. Usov, V. N. Zhabin, V. V. Zhulanov

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

Аннотация

The dynamics of the process e+e-→ π+π-π is studied in the energy region from 1.15 to 2.00 GeV using data accumulated with the SND detector at the VEPP-2000 e+e- collider. The Dalitz plot distribution and π+π- mass spectrum are analyzed in a model including the intermediate states ρ(770) π, ρ(1450) π, and ωπ. As a result, the energy dependences of the ρ(770) π and ρ(1450) π cross sections and the relative phases between the ρ(770) π amplitude and the ρ(1450) π and ωπ amplitudes are obtained. The ρ(1450) π cross section has a peak in the energy region of the ω(1650) resonance (1.55–1.75 GeV). In this energy range the contributions of the ρ(770) π and ρ(1450) π states are of the same order of magnitude. No resonance structure near 1.65 GeV is observed in the ρ(770) π cross section. We conclude that the intermediate state ρ(1450) π gives a significant contribution to the decay of ω(1650) → π+π-π, whereas the ρ(770) π mechanism dominates in the decay ω(1420) → π+π-π.

Язык оригиналаанглийский
Номер статьи993
Число страниц9
ЖурналEuropean Physical Journal C
Том80
Номер выпуска10
DOI
СостояниеОпубликовано - 1 окт 2020

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