Abstract
The Glashow—Salam—Weinberg theory combines the electromagnetic and weak interactions within the framework of the gauge group SU(2)L × SU(1). This theory treats leptons and quarks on the same footing. However, the fact that leptons carry integer charge while the charge of quarks is 1/3 is needed as a basic input. On the other hand, there are indications that this fact is due to some superior principle, that is a larger symmetry. For example, for leptons as well as for quarks, the sum of charge and baryon number, Q + B, is an integer:
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Bibliographical Notes
GEORGI, Howard, theoretical physicist, *6.1.1947 in San Bernardino (California), received Ph.D. at Yale University. Since 1980 professor at Harvard University, working on unified models of elementary particle physics.
YOUNG, Alfred, mathematician, † 1940. Young earned his living as a country clergyman in Birdbrook, near Cambridge, which left him with little time for mathematics. His ideas to use diagrams to classify the representations of the permutation group were developed in a series of articles 1901–02 and 1928–34, which aimed at developing invariant theory [cf. G. de B. Robinson: Representation Theory of the Symmetric Group (University of Toronto Press 1961)].
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© 2000 Springer-Verlag Berlin Heidelberg
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Greiner, W., Müller, B. (2000). Unified Gauge Theories. In: Gauge Theory of Weak Interactions. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-04211-3_9
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DOI: https://doi.org/10.1007/978-3-662-04211-3_9
Publisher Name: Springer, Berlin, Heidelberg
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