By Cecilia Jarlskog (auth.), Dietrich E. C. Fries, Julius Wess (eds.)
The NATO complicated summer time Institute 1978 was once held at Karlsruhe from Sept. four to Sept. sixteen. The name of the college "New Phenomena in Lepton and Hadron Physics" pertains to the current very fascinating part in particle physics. a magnificent quantity of experimental facts has been accrued in aid of a primary new photo of the subnuclear international, - an image which has stumbled on its theoretical formula in Que~tum Chromodynamics and Gau~ theories. it's a normal philosophy of the ASI to handle the classes almost always to younger and studying scientists, for that reason our significant target used to be to provide systematic stories of either, the experimental situa tion and the fundamental theoretical innovations of the sphere. This quantity includes the written models of the key lectures brought through the path. furthermore a number of lectures and seminars have been scheduled within which additionally extra unique and really good topics have been discus sed by way of invited audio system and individuals of the varsity. no longer all of those contributions are contained during this book.
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M. BOhm and H. Joos, DESY Report 78/27 Tin German); this article includes an abundant list of references. H. Harari, Phys. Reports 42C: 235 (1978). J. Iliopoulos, CERN Yellow Report 77-18, pp. 36-78. C. Taylor, Gauge theories of weak interactions, Cambridge University Press (1976). The SU(5) model and its consequences may be found in, for example, 6. 7. 8. 9. 10. H. L. Glashow, Phys. Rev. Lett. 32, 438 (1974). H. Georgi, H. Quinn and S. Weinberg, Phys. Rev. Lett. 33, 451 '(1974). A. Buras, J. Ellis, M.
Fifteen gauge bosons (all except the gluons and the photon) have become massive. Therefore there are 34 - 15 = 19 Higgses in the theory. The reader can easily convince herself that these consist of a neutral colour octet, three neutral colour singlets, two colour singlets with ±l unit of charge, a colour triplet with charges -1/3 and the antiparticles of the latter. Although the Higgs sector of the SU(5) might seem outrageous, we must take it seriously because we lack an alternative for the generation of masses of the vector bosons.
BI09, 213(76)) were the phenomenology of the model is discussed). ---14. GRAND UNIFICATION So far, in these lectures, we have discussed the conventional theory for weak and electromagnetic interaction. Nowadays, strong interactions are believed to be described by quantum chromodynamics (QCD), a nonabelien gauge theory based on the group SU(3); viz. three colours and eight mediators (gluons). This theory is not broken and the gluons are massless. In this section, we discuss 39 GAUGE THEORIES the Georgi - Glashow model (Phys.