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Direct measurement of the phi(1020) leptonic branching ratio |
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| Authors: | Achasov M N Beloborodov K I Berdyugin A V Bogdanchikov A G Bozhenok A V Bukin A D Bukin D A Burdin S V Dimova T V Drozdetsky A A Druzhinin V P Dubrovin M S Gaponenko I A Golubev V B Ivanchenko V N Ivanov P M Korol A A Koshuba S V Lysenko A P Nesterenko I N Pakhtusova E V Perevedentsev E A Salnikov A A Serednyakov S I Shary V V Shatunov Y M Sidorov V A Silagadze Z K Skrinsky A N Usov Y V Vasiljev A V |
| Affiliation: | Budker Institute of Nuclear Physics and Novosibirsk State University, 630090, Novosibirsk, Russia. |
| 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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