The Case of ${\alpha }_s$: $Z$ versus Low Energies, or How Nature Prompts us of New Physics

Abstract

The values of ${\alpha }_s$ determined from low- and high-energy measurements are in irreconcilable contradiction with each other. The current status of the problem is critically reviewed. Consequences of the ${\alpha }_s$ contradiction, in conjunction with other anomalies detected at the $Z$ peak, are discussed. The write-up is updated in accordance with experimental numbers reported at summer conferences.

Talk at the International Symposium on Particle Theory and Phenomenology (XVIII Kazimierz Meeting on Particle Physics and 1995 Madison Phenomenology Symposium), Iowa State University, Ames, May 22 - 24, 1995. Latex file, 34 pages; 6 figures included as eps files; additional 3 figures are available upon request. Three references added, minor modifications

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