Title

Measurements of R and A search for heavy-Quark production in e+e- annihilation at s=50 and 52 GeV

Authors

H. Sagawa, High Energy Accelerator Research Organization, Tsukuba
T. Mori, University of Rochester
K. Abe, High Energy Accelerator Research Organization, Tsukuba
S. Chakrabarti, High Energy Accelerator Research Organization, Tsukuba
Y. Fujii, High Energy Accelerator Research Organization, Tsukuba
Y. Higashi, High Energy Accelerator Research Organization, Tsukuba
S. Ishimoto, High Energy Accelerator Research Organization, Tsukuba
Y. Kurihara, High Energy Accelerator Research Organization, Tsukuba
A. Maki, High Energy Accelerator Research Organization, Tsukuba
P. Mani, High Energy Accelerator Research Organization, Tsukuba
T. Nozaki, High Energy Accelerator Research Organization, Tsukuba
T. Omori, High Energy Accelerator Research Organization, Tsukuba
P. Perez, High Energy Accelerator Research Organization, Tsukuba
Y. Sakai, High Energy Accelerator Research Organization, Tsukuba
Y. Sugimoto, High Energy Accelerator Research Organization, Tsukuba
Y. Takaiwa, High Energy Accelerator Research Organization, Tsukuba
S. Terada, High Energy Accelerator Research Organization, Tsukuba
K. Tsuchiya, High Energy Accelerator Research Organization, Tsukuba
A. Bacala, Louisiana State University
R. Imlay, Louisiana State University
P. Kirk, Louisiana State University
W. Marterer, Louisiana State University
R. R. McNeil, Louisiana State University
W. Metcalf, Louisiana State University
C. P. Cheng, Institute of High Energy Physics Chinese Academy of Science
Z. P. Mao, Institute of High Energy Physics Chinese Academy of Science
Y. Yan, Institute of High Energy Physics Chinese Academy of Science
Y. T. Xu, Institute of High Energy Physics Chinese Academy of Science
H. S. Zhou, Institute of High Energy Physics Chinese Academy of Science
Y. C. Zhu, Institute of High Energy Physics Chinese Academy of Science
A. Abashian, Virginia Polytechnic Institute and State University
K. Gotow, Virginia Polytechnic Institute and State University
F. Kajino, Virginia Polytechnic Institute and State University

Document Type

Article

Publication Date

1-1-1988

Abstract

The ratio R of the cross section for e+e- annihilation into hadronic final states to the QED cross section for muon-pair production is measured to be 4.340.450.30 and 4.230.200.21 at c.m. energies of 50 and 52 GeV, respectively. From these values of R and an analysis of the event shapes we deduce a 95%-confidence-level upper limit for the production rate of new heavy charge +23e or -13e quarks to be 0.19 units of R. © 1988 The American Physical Society.

Publication Source (Journal or Book title)

Physical Review Letters

First Page

93

Last Page

96

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