Analysis of electroweak precision data and prospects for future improvements |
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Authors: | Kaoru Hagiwara Dieter Haidt Seiji Matsumoto |
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Institution: | (1) Theory Group, KEK, Tsukuba, Ibaraki 305, Japan (e-mail: kaoru.hagiwara@kek.jp) , JP;(2) ICEPP, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113, Japan (e-mail: seiji.matsumoto@kek.jp) , JP;(3) DESY, Notkestrasse 85, D-22603 Hamburg, Germany (e-mail: haidt@dice2.desy.de) , DE |
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Abstract: | We update our previous work on an analysis of the electroweak data by including new and partly preliminary data available
up to the 1996 summer conferences. The new results on the partial decay widths into and hadrons now offer a consistent interpretation of all data in the minimal standard model. The value extracted for the strong
interaction coupling constant agrees well with determinations in other areas. New constraints on the universal parameters , and are obtained from the updated measurements. No signal of new physics is found in the , , analysis once the SM contributions with GeV and those of not a too heavy Higgs boson are accounted for. The naive QCD-like technicolor model is now ruled out at the
99% CL even for the minimal model with . In the absence of a significant new physics effect in the electroweak observables, constraints on masses of the top quark,
, and Higgs boson, , are derived as a function of and the QED effective coupling . The preferred range of depends rather strongly on the actual value of : for , while for at 95% CL. Prospects due to forthcoming improved measurements of asymmetries, the mass of the weak boson
, and are discussed. Anticipating uncertainties of 0.00020 for , 20 MeV for , and 2 GeV for , the new physics contributions to the , , parameters will be constrained more severely, and, within the SM, the logarithm of the Higgs mass can be constrained to about
. The better constraints on , , and on within the minimal SM should be accompanied with matching precision in .
Received: 18 June 1997 |
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