STUDY OF THE 𝑒+𝑒- → π+π-π0 PROCESS DYNAMICS IN THE ENERGY RANGE 1.075–1.975 GeV

M. N. Achasov; Ачасов М. Н.; A. Yu. Barnyakov; Барняков А. Ю.; K. I. Beloborodov; Белобородов K. И.; D. E. Berkaev; Беркаев Д. Е.; A. V. Berdyugin; Бердюгин А. В.; A. G. Bogdanchikov; Богданчиков А. Г.; A. A. Botov; Ботов А. А.; V. S. Denisov; Денисов В. С.; T. V. Dimova; Димова Т. В.; V. P. Druzhinin; Дружинин В. П.; V. N. Zhabin; Жабин В. Н.; V. V. Zhulanov; Жуланов В. В.; I. M. Zemlyansky; Землянский И. М.; L. V. Kardapoltsev; Кардапольцев Л. В.; A. A. Kattsin; Катцин А. А.; A. N. Kirpotin; Кирпотин А. Н.; D. P. Kovrizhin; Коврижин Д. П.; I. A. Koop; Кооп И. А.; A. A. Korol; Король А. А.; A. S. Kupich; Купич А. С.; A. P. Kryukov; Крюков А. П.; N. A. Melnikova; Мельникова Н. А.; N. Yu. Muchnoi; Мучной Н. Ю.; A. E. Obrazovsky; Oбразовский А. Е.; E. V. Pakhtusova; Пахтусова Е. В.; E. A. Perevedentsev; Переведенцев Е. А.; K. V. Pugachev; Пугачев К. В.; Yu. A. Rogovsky; Роговский Ю. А.; S. I. Serednyakov; Середняков С. И.; Z. K. Silagadze; Силагадзе З. К.; I. K. Surin; Сурин И. К.; M. V. Timoshenko; Тимошенко М. В.; Yu. V. Usov; Усов Ю. В.; L. B. Fomin; Фомин Л. Б.; A. G. Kharlamov; Харламов А. Г.; Yu. M. Shatunov; Шатунов Ю. М.; D. A. Shtol; Штоль Д. А.; E. A. Eminov; Эминов Э. А.

doi:10.31857/S0044002724060085

STUDY OF THE 𝑒+𝑒- → π+π-π0 PROCESS DYNAMICS IN THE ENERGY RANGE 1.075–1.975 GeV

Authors: Achasov M.N.¹^,2, Barnyakov A.Y.¹^,3, Beloborodov K.I.¹^,2, Berkaev D.E.¹^,2, Berdyugin A.V.¹^,2, Bogdanchikov A.G.¹, Botov A.A.¹, Denisov V.S.¹^,2, Dimova T.V.¹^,2, Druzhinin V.P.¹^,2, Zhabin V.N.¹, Zhulanov V.V.¹^,2, Zemlyansky I.M.¹^,2, Kardapoltsev L.V.¹^,2, Kattsin A.A.¹, Kirpotin A.N.¹, Kovrizhin D.P.¹, Koop I.A.¹^,2, Korol A.A.¹^,2, Kupich A.S.¹^,2, Kryukov A.P.¹, Melnikova N.A.¹, Muchnoi N.Y.¹^,2, Obrazovsky A.E.¹, Pakhtusova E.V.¹, Perevedentsev E.A.¹, Pugachev K.V.¹^,2, Rogovsky Y.A.¹^,2, Serednyakov S.I.¹^,2, Silagadze Z.K.¹^,2, Surin I.K.¹, Timoshenko M.V.¹, Usov Y.V.¹, Fomin L.B.¹, Kharlamov A.G.¹^,2, Shatunov Y.M.¹, Shtol D.A.¹, Eminov E.A.¹
Affiliations:
1. Budker Institute of Nuclear Physics, Siberian Branch of the Russian Academy of Sciences
2. Novosibirsk State University
3. Novosibirsk State Technical University
Issue: Vol 87, No 6 (2024)
Pages: 513-524
Section: ЭЛЕМЕНТАРНЫЕ ЧАСТИЦЫ И ПОЛЯ. Эксперимент
URL: https://journals.rcsi.science/0044-0027/article/view/281913
DOI: https://doi.org/10.31857/S0044002724060085
EDN: https://elibrary.ru/HOYVVI
ID: 281913

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Abstract

The 𝑒+𝑒− → π+π−π0 process was studied in the energy range from 1.075 to 1.975 GeV basing on the data with an integral luminosity of about 70 pb−1, accumulated in the experiment with the SND detector at the 𝑒+𝑒− collider VEPP-2000. Dalitz distributions were analyzed in a model including the intermediate states ρ(770)π, ρ(1450)π and ωπ0. As a result, the energy dependences of the total cross section of the process 𝑒+𝑒− → π+π−π0, cross sections for intermediate states ρ(770)π and ρ(1450)π and the relative phases between the amplitude ρ(770)π and the amplitudes ρ(1450)π and ωπ0 were measured. In the vector dominance model, for the first time it was carried out joint approximation of the cross sections 𝑒+𝑒− → ρ(770)π and ρ(1450)π and the relative phase between the amplitudes of these states. The contributions of the ω, ϕ, ω(1420) and ω(1650) resonances were taken into account. As a result of the approximation, it was found that the decay ω(1650) → π+π−π0 goes mainly through the intermediate state ρ(1450)π, while in the decay of ω(1420) → π+π−π0 the ρ(770)π mechanism dominates. The obtained results clarify the previous measurement of the SND.

References

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STUDY OF THE 𝑒+𝑒- → π+π-π0 PROCESS DYNAMICS IN THE ENERGY RANGE 1.075–1.975 GeV

Full Text

Abstract

About the authors

References

Supplementary files