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. 2001 Feb 26;86(9):1698-701.
doi: 10.1103/PhysRevLett.86.1698.

Direct measurement of the phi(1020) leptonic branching ratio

M N Achasov  1 , 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, E V Pakhtusova, E A Perevedentsev, A A Salnikov, S I Serednyakov, V V Shary, Y M Shatunov, V A Sidorov, Z K Silagadze, A N Skrinsky, Y V Usov, A V Vasiljev
Affiliations

Direct measurement of the phi(1020) leptonic branching ratio

M N Achasov et al. Phys Rev Lett. .

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.

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