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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 1999, vol. 456, p. 304-309

Measurement of the decay φ→μ+μ-

Achasov M. N., Baru S. E., Bozhenok A. V., 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. I., Korol A. A., Koshuba S. V., Perevedentsev E. A., Pyata E. E., Salnikov A. A., Serednyakov S. I., Shary V. V., Shatunov Yu M., Sidorov V. A., Silagadze Z. K., Usov Yu V.

The process e+e-→μ+μ- has been studied with SND detector at VEPP-2M e+e- collider in the vicinity of φ(1020) resonance. The product of branching ratios of φ meson into leptons √B(φ→μ+μ-) · B(φ→e+e-) = (3.14 ± 0.22 ± 0.14) · 10-4 was measured from the interference in the cross section of the process e+e-→μ+μ-. The branching ratio B(φ→μ+μ-) = (3.30 ± 0.45 ± 0.32) · 10-4 was obtained. © 1999 Elsevier Science B.V. All rights reserved.