EPJ

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EPJ C - Particles and Fields
Particles and Fields
Eur. Phys. J. C 12, 25-33
DOI 10.1007/s100529900222

Experimental study of the processes \( e^{+}e^{-}\rightarrow \phi \rightarrow \eta \gamma , \pi ^{0}\gamma \protect \)
at VEPP-2M

M.N. Achasov - A.V. Berdyugin - A.V. Bozhenok - D.A. Bukin - S.V. Burdin - T.V. Dimova - V.P. Druzhinin - M.S. Dubrovin - I.A. Gaponenko - V.B. Golubev - V.N. Ivanchenko - A.A. Korol - S.V. Koshuba - E.V. Pakhtusova - A.A. Salnikov - S.I. Serednyakov - V.V. Shary - Yu.M. Shatunov - V.A. Sidorov - Z.K. Silagadze

Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia

Received: 26 April 1999 / Revised version: 18 June 1999 / Published online: 16 November 1999

Abstract
The processes \(e^+e^-\rightarrow\eta\gamma, \pi^0\gamma\rightarrow 3\gamma \protect\) were studied in the SND experiment at the VEPP-2M collider in the energy region of the \(\phi\protect\)meson. The branching ratios obtained in this study are \( \mathrm{Br}(\phi \rightarrow \eta \gamma)=(1.338\pm 0.012\pm 0.052)\%\protect \) and \( \mathrm{Br}(\phi \rightarrow \pi ^{0}\gamma )=(1.226\pm 0.036_{-0.089}^{+0.096})\times 10^{-3}\protect \). A comparison of the experimental data with different theoretical models was performed.

Copyright Springer-Verlag 2000

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