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Direct measurement of the phi(1020) leptonic branching ratio

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arxiv hep-ex/0102029 v1 pith:Q4FAZDXE submitted 2001-02-12 hep-ex

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
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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 E.V.Pakhtusova E.A.Perevedentsev A.A.Salnikov S.I.Serednyakov V.V.Shary Yu.M.Shatunov V.A.Sidorov Z.K.Silagadze A.N.Skrinsky Yu.V.Usov A.V.Vasiljev
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keywords phi-branchingratioleptonicmu-euniversalityadditionalagrees
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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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