Measurement of the decay phi->mu+mu-
M.N.Achasov, S.E.Baru, 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, P.I.Ivanov, A.A.Korol, S.V.Koshuba, E.A.Perevedentsev,, E.E.Pyata, A.A.Salnikov, S.I.Serednyakov, V.V.Shary, Yu.M.Shatunov,
TL;DR
This study measures the branching ratio of the phi meson decaying into mu+mu- using interference effects observed in e+e- collision data near the phi resonance, providing precise experimental results.
Contribution
The paper presents the first measurement of the phi meson decay into mu+mu- via interference analysis at VEPP-2M collider.
Findings
Measured the product of branching ratios: (3.14±0.22±0.14)×10^{-4}
Determined the branching ratio B(phi->mu+mu-): (3.30±0.45±0.32)×10^{-4}
Confirmed the decay rate consistent with theoretical expectations.
Abstract
The process e^+e^- ->mu^+mu^- has been studied with SND detector at VEPP-2M e^+e^- collider in the vicinity of phi(1020) resonance. The product of branching ratios of phi meson into leptons \sqrt{B(phi->mu^+mu^-) B(phi-> e^+e^-)}=(3.14+-0.22+-0.14)x10^{-4} was measured from the interference in the cross section of the process e^+e^- ->mu^+mu^-. The branching ratio B(phi->mu^+mu^-)=(3.30+-0.45+-0.32)x10^{-4} was obtained.
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