title: Direct measurement of the phi(1020) leptonic branching ratio.
abstract: The process e(+)e(-)-->mu(+)mu(-) has been studied by the SND detector at the VEPP-2M e(+)e(-) collider in the phi(1020)-resonance energy region. The measured effective phi meson leptonic branching ratio B(phi-->l(+)l(-)) identical with square root of B(phi-->e(+)e(-))B(phi-->mu(+)mu(-))] = (2.89 +/- 0.10 +/- 0.06) x 10(-4) agrees well with the Particle Data Group value B(phi-->e(+)e(-)) = (2.91 +/- 0.07) x 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) x 10(-4) was obtained.
authors: Budker Institute of Nuclear Physics and Novosibirsk State University, 630090, Novosibirsk, Russia.
authors: M N
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authors: Achasov
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authors: Beloborodov
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authors: Berdyugin
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authors: Bogdanchikov
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authors: Bozhenok
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authors: Bukin
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authors: Burdin
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authors: Dimova
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authors: Drozdetsky
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authors: Druzhinin
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authors: Dubrovin
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authors: Gaponenko
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authors: Golubev
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authors: Ivanchenko
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authors: Ivanov
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authors: Koshuba
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authors: Lysenko
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authors: Nesterenko
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authors: Pakhtusova
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authors: Perevedentsev
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authors: Salnikov
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authors: Serednyakov
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authors: Shary
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authors: Shatunov
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authors: Sidorov
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authors: Silagadze
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authors: Skrinsky
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authors: Vasiljev