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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2003, vol. 559, p. 171-178

Experimental study of the e+e- → π0γ process in the energy region √s = 0.60-0.97 GeV

Achasov M. N., Beloborodov K. I., Berdugin A. V., Bogdanchikov A. G., Bozhenok A. V., Bukin A. D., Bukin D. A., Dimova T. V., Druzhinin V. P., Golubev V. B., Ivanchenko V. N., Korol A. A., Koshuba S. V., Pakhtusova E. V., Polunin A. A., Pyata E. E., Salnikov A. A., Serednyakov S. I., Shary V. V., Shatunov Yu M., Sidorov V. A., Silagadze Z. K., Skrinsky A. N., Skripkin A. G., Usov Yu V., Valishev A. A., Vasiljev A. V.

Results of the study of the e+e- → π0γ process with SND detector at VEPP-2M collider in the c.m.s. energy range √s = 0.60-0.97 GeV are presented. Using 36513 selected events, corresponding to a total integrated luminosity of 3.4 pb-1, the e+e- → π0γ cross section was measured. The energy dependence of the cross section was analyzed in the framework of the vector meson dominance model. The data are well described by a sum of φ, ω, ρ → π0γ decay contributions with measured decay probabilities: Br(ω → π0γ) = (9.34 ± 0.15 ± 0.31)% and Br(ρ0 → π0γ) = (5.15 ± 1.16 ± 0.73) × 10-4. The ρ-ω relative interference phase is ψρω = (-10.2 ± 6.5 ± 2.5) degrees. © 2003 Published by Elsevier Science B.V.