Direct measurement of the phi(1020) leptonic branching ratio
M.N.Achasov, K.I.Beloborodov, A.V.Berdyugin, A.G.Bogdanchikov,, A.V.Bozhenok, A.D.Bukin, D.A.Bukin, S.V.Burdin, T.V.Dimova, A.A.Drozdetsky,, V.P.Druzhinin, M.S.Dubrovin, I.A.Gaponenko, V.B.Golubev, V.N.Ivanchenko,, P.M.Ivanov, A.A.Korol, S.V.Koshuba, A.P.Lysenko, I.N.Nesterenko,
TL;DR
This study directly measures the phi(1020) meson's leptonic branching ratios using e+e- collisions, confirming mu-e universality and providing precise values consistent with previous data.
Contribution
The paper presents a direct measurement of the phi(1020) meson's leptonic branching ratios, including a new value for B(phi->mu+mu-) without assuming mu-e universality.
Findings
Measured B(phi->l+l-) = (2.89+-0.10+-0.06)*10^{-4}
Confirmed mu-e universality in phi decays
Obtained B(phi->mu+mu-) = (2.87+-0.20+-0.14)*10^{-4}
Abstract
The process e+e-->mu+mu- has been studied by SND detector at VEPP-2M e+e- collider in the phi(1020)-resonance energy region. The measured effective phi meson leptonic branching ratio: B(phi->l+l-)=sqrt{B(phi->e+e-)*B(phi->mu+mu-)}=(2.89+-0.10+-0.06)*10^{-4} agrees well with the PDG value B(phi->e+e-)=(2.91+-0.07)*10^{-4} confirming mu-e universality. Without additional assumption of mu-e universality the branching ratio B(phi->mu+mu-)=(2.87+-0.20+-0.14)*10^{-4} was obtained.
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