Determination of the electronic branching ratio of the ϒ(9.46) and an upper limit for its total width期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Determination of the electronic branching ratio of the ϒ(9.46) and an upper limit for its total width

Authors:	Ch. Berger W. Lackas F. Raupach W. Wagner G. Alexander J. Bürger L. Criegee H.C. Dehne R. Devenish G. Flügge G. Franke Ch. Gerke E. Hackmack P. Harms G. Horlitz G. Knies E. Lehmann K. Wacker

Affiliation:	Deutsches Elektronen-Synchroton DESY, Hamburg Germany

Abstract:	We have measured the reaction e⁺e^? → e⁺e^? at the ? Using athe excess of electron pairs over the QED expectation we obtain an electronic branching ratio of B_ee = (5.1 ± 3.0) %. Combining this with publishe values of the muonic branching ratio B_μμ we conclude that the ? is a narrow state with a total width < 180 keV at 95% C.L.

Keywords:	PLUTO Collaboration
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