Study of the Process e+e → ηπ0γ in the Cossision-Energy Range of √s=1.05−2.00 GeV

M. N. Achasov, A. Yu Barnyakov, A. A. Baykov, K. I. Beloborodov, A. V. Berdyugin, A. G. Bogdanchikov, A. A. Botov, V. B. Golubev, T. V. Dimova, V. P. Druzhinin, V. N. Zhabin, L. V. Kardapoltsev, D. P. Kovrizhin, A. A. Korol, A. S. Kupich, K. A. Martin, N. A. Melnikova, N. Yu Muchnoi, A. E. Obrazovsky, E. V. PakhtusovaK. V. Pugachev, Ya S. Savchenko, S. I. Serednyakov, Z. K. Silagadze, I. K. Surin, Yu V. Usov, A. G. Kharlamov, D. A. Shtol

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

Аннотация

The process e+e → ηπ0γ is studied in the range of center-of-mass (c.m.) collision energies between 1.05 and 2.00 GeV on the basis of data corresponding to an integrated luminosity of 94.5 pb-1 that were accumulated in an experiment with the SND detector at the VEPP-2000 e+e collider. The cross section for this process was measured for the first time and was found to receive a dominant contribution from the mechanism of a transition through an ωη intermediate state. The cross section measured for the process e+e → ωη → ηπ0γ agrees with the results of earlier measurements in the channel e+e → π+ππ0η. At a level of 5.7 standard deviations (5.7 σ), it is established that the process e+e → ηπ0γ is not fully described by hadronic intermediate states of the VP type. The cross section was measured for this missing contribution, which may be generated by radiative processes—for example, e+e → a0(1450)γ. It ranges from 15 to 20 pb over a broad energy interval extending from 1.3 to 1.9 GeV.

Язык оригиналаанглийский
Страницы (с-по)197-200
Число страниц4
ЖурналPhysics of Atomic Nuclei
Том84
Номер выпуска2
DOI
СостояниеОпубликовано - мар 2021

Предметные области OECD FOS+WOS

  • 1.03 ФИЗИЧЕСКИЕ НАУКИ И АСТРОНОМИЯ
  • 1.03.UN ФИЗИКИ, ЯДЕРНАЯ
  • 1.03.UP ФИЗИКА, ЧАСТИЦЫ И ПОЛЯ

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