Abstract
It is shown that a particular chain of symmetry breaking inSO(10) theory which leads to a standard picture of low energy phenomena, allows the scale ofSU (4) c quark-lepton symmetry breaking to be as low as 105–106 GeV. This, among other predictions, gives rise to rare kaon decays with\(B(K_L \to \bar \mu e) \cong 10^{ - 9} - 10^{ - 13} \) and proton lifetime in the range 1031–1034 years. Also, there exist the second neutral gauge boson and right-handed neutrinos with masses in the range: few hundred-105 GeV.
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While this paper was readied for publication we became aware of: A. Rayachandhuri, P. Roy: Tata Inst. preprint, 1982, who also discuss the value ofM c . We disagree, however, in the application of the survival principle; in particular they keep a left-handed analogue of (1, −1, 10) artificially light, whereas it should be superheavy (recall that left-right symmetry is broken atM x )
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Senjanović, G., Sokorac, A. Light lepto-quarks inSO(10). Z. Phys. C - Particles and Fields 20, 255–257 (1983). https://doi.org/10.1007/BF01574858
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DOI: https://doi.org/10.1007/BF01574858