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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2001, vol. 504, p. 275-281

Study of conversion decaysφ → ηe+e- and η → γ e+ e- in the experiment with SND detector at VEPP-2M collider

Achasov M. N., Aulchenko V. M., Beloborodov K. I., Berdyugin A. V., Bogdanchikov A. G., Bozhenok A. V., Bukin A. D., Bukin D. A., Burdin S. V., Dimova T. V., Druzhinin V. P., Dubrovin M. S., Gaponenko I. A., Golubev V. B., Ivanchenko V. N., Ivanov P. M., Korol A. A., Koshuba S. V., Kukartsev G. A., Mamutkin A. A., Otboev A. V., Pakhtusova E. V., Salnikov A. A., Serednyakov S. I., Shary V. V., Shatunov Yu M., Sidorov V. A., Silagadze Z. K., Skrinsky A. N., Valishev A. A., Vasiljev A. V.

The conversion decays φ → ηe+e- and η → γe+e- were studied by the SND detector using φ-meson production in e+e--annihilation at VEPP-2M collider. The branching ratios of these decays were measured: Br(φ → ηe+e-) = (1.19 ± 0.19 ± 0.07) × 10-4 and Br(η → γe+e-) = (5.15 ± 0.62 ± 0.39) × 10-3. The e+e--pair mass spectra and transition form factors were also studied. © 2001 Published by Elsevier Science B.V.