Measurement of the decay φ→ μ+μ

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 pro...

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Published in:Physics letters. B 1999-06, Vol.456 (2), p.304-309
Main Authors: 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
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Language:English
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Summary: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.
ISSN:0370-2693
1873-2445
DOI:10.1016/S0370-2693(99)00502-X