Abstract
A brief review, aimed at non-specialists, is given of present knowledge of the parameters needed to describe strong and electroweak interactions at energies up to a few hundred GeV. Empirical evidence that the strong and electroweak couplings converge to a single * grand unified * coupling at much higher energies is reviewed and the uncertainties in the calculation of the proton lifetime in the minimal SU (5) theory are discussed.
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4 articles.
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