Study of dynamics of the process in the energy range 1.15–2.00 GeV

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. Martin; N. 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

doi:10.1140/epjc/s10052-020-08524-4

2022 Impact factor 4.4

Particles and Fields

Open Access

Eur. Phys. J. C (2020) 80: 993
https://doi.org/10.1140/epjc/s10052-020-08524-4

Regular Article – Experimental Physics

SND Collaboration

M. N. Achasov¹^,2, A. Yu. Barnyakov¹^,2, A. A. Baykov¹^,2, K. I. Beloborodov¹^,2, A. V. Berdyugin¹^,2, D. E. Berkaev¹^,2, A. G. Bogdanchikov¹, A. A. Botov¹, T. V. Dimova¹^,2^j, V. P. Druzhinin¹^,2, V. B. Golubev¹, A. N. Kirpotin¹, L. V. Kardapoltsev¹^,2, A. S. Kasaev¹, A. G. Kharlamov¹^,2, I. A. Koop¹^,2, A. A. Korol¹^,2, D. P. Kovrizhin¹, A. S. Kupich¹, K. A. Martin¹, N. A. Melnikova¹, N. Yu. Muchnoy¹^,2, A. E. Obrazovsky¹, E. V. Pakhtusova¹, K. V. Pugachev¹^,2, D. V. Rabusov¹, Yu. A. Rogovsky¹^,2, Y. S. Savchenko¹^,2, A. I. Senchenko¹^,2, S. I. Serednyakov¹^,2, D. N. Shatilov¹, Yu. M. Shatunov¹^,2, D. A. Shtol¹, D. B. Shwartz¹^,2, Z. K. Silagadze¹^,2, I. K. Surin¹, M. V. Timoshenko¹, Yu. V. Usov¹, V. N. Zhabin¹ and V. V. Zhulanov¹^,2

¹ Budker Institute of Nuclear Physics, SB RAS, 630090, Novosibirsk, Russia
² Novosibirsk State University, 630090, Novosibirsk, Russia

^j baiert@inp.nsk.su

Received: 30 July 2020
Accepted: 6 October 2020
Published online: 27 October 2020

Abstract

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

© The Author(s) 2020

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