Direct measurement of the φ (1020) leptonic branching ratio

被引：9

作者：

Achasov, MN

Beloborodov, KI

Berdyugin, AV

Bogdanchikov, AG

Bozhenok, AV

Bukin, AD

Bukin, DA

Burdin, SV ^{[1
]}

Dimova, TV

Drozdetsky, AA

Druzhinin, VP

Dubrovin, MS

Gaponenko, IA

Golubev, VB

Ivanchenko, VN

Ivanov, PM

Korol, AA

Koshuba, SV

Lysenko, AP

Nesterenko, IN

Pakhtusova, EV

Perevedentsev, EA

Salnikov, AA

Serednyakov, SI

Shary, VV

Shatunov, YM

Sidorov, VA

Silagadze, ZK

Skrinsky, AN

Usov, YV

Vasiljev, AV

机构：

[1] Budker Inst Nucl Phys, Novosibirsk 630090, Russia

[2] Novosibirsk State Univ, Novosibirsk 630090, Russia

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 09期

关键词：

D O I：

10.1103/PhysRevLett.86.1698

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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(-)) = rootB(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.

引用

页码：1698 / 1701

页数：4

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