The hadronic cross section of electron-positron annihilation at 9.5 GeV and the ϒ and ϒ′ resonance parameters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

The hadronic cross section of electron-positron annihilation at 9.5 GeV and the ϒ and ϒ′ resonance parameters

Authors:	H. Albrecht R. Childers C.W. Darden G. Drews H. Hasemann W. Schmidt-Parzefall H. Schröder H.D. Schulz F. Selonke E. Steinmann R. Wurth W. Hofmann A. Markees D. Wegener K.R. Schubert J. Stiewe R. Waldi S. Weseler Yu. Zaitsev

Affiliation:	Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany;Institut für Physik, Universität Dortmund, Germany;Institut für Hochenergiephysik, Universität Heidelberg, Germany;Institute of Physics, University of Lund, Sweden

Abstract:	The reaction e⁺e^?→ hadrons has been measured in the ? and ?′ region using the DASP detector at the DESY storage ring DORIS. The following final results are obtained: R_had(9.5 GeV)=3.73±0.16±0.28, Γ_ee(?)=(1.23 ± 0.08 ± 0.12) keV, B_μμ(?)=(3.2±1.3±0.3)%, $Γ_{ee} Γ_{had} Γ_{tot} (?′)=(0.55±0.11 ±0.06) keV$ , and M(?′)?M(?)=(556 ±10) MeV.

Keywords:	ABCHW Collaboration
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