Measurements of R and A search for heavy-Quark production in e+e- annihilation at s=50 and 52 GeV
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
Recommended Citation
Sagawa, H., Mori, T., Abe, K., Chakrabarti, S., Fujii, Y., Higashi, Y., Ishimoto, S., Kurihara, Y., Maki, A., Mani, P., Nozaki, T., Omori, T., Perez, P., Sakai, Y., Sugimoto, Y., Takaiwa, Y., Terada, S., Tsuchiya, K., Bacala, A., Imlay, R., Kirk, P., Marterer, W., McNeil, R., Metcalf, W., Cheng, C., Mao, Z., Yan, Y., Xu, Y., Zhou, H., Zhu, Y., Abashian, A., Gotow, K., & Kajino, F. (1988). Measurements of R and A search for heavy-Quark production in e+e- annihilation at s=50 and 52 GeV. Physical Review Letters, 60 (2), 93-96. https://doi.org/10.1103/PhysRevLett.60.93