Search for charm production in direct decays of the ϒ(1S) resonance

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Abstract

The production ofD *(2010)+ andJ/ψ mesons and prompt leptons has been investigated ine + e interactions at the Ψ(1S) resonance energy. The data were collected at the storage ring DORIS II at DESY with the ARGUS detector. We obtain upper limits of BRdir (ϒ (1S)→D *(2010)±+X)<0.019 (forx p >0.2) and BRdir (ϒ(1S)→J/ψ+X)<0.68×10−3, both at the 90% confidence level. From the prompt lepton analysis, a model dependent limit of BRdir (ϒ(1S)→Y c +X)<0.034 (Y c denoting a charm-containing particle) is derived.

Supported by the German Bundesministerium für Forschung und Technologie, under contract number 054DO51P
Supported by the German Bundesministerium für Forschung und Technologie, under contract number 054ER 12P
Supported by the German Bundesministerium für Forschung und Technologie, under contract number 055HD21P
Supported in part by the Walter C. Sumner Foundation
Supported by the Natural Sciences and Engineering Research Council, Canada
Supported by the German Bundesministerium für Forschung und Technologie, under contract number 054KA 17P
Supported by the Department of Science and Technology of the Republic of Slovenia and the Internationales Büro KfA, Jülich
Supported by the Swedish Research Council