Decays of heavy quarks

The weak decay of heavy b and t quarks is discussed using the mixing angles obtained in Fritzsch's model (1978). The author finds that the decay b to c dominates over b to u for 7<or=m, <or= 15 GeV by at least 2 to 1 and that the semileptonic branching ratio of b is approximately =14%; the b-quark lifetime is approximately 1.6*10/sup -13/ sec. for m /sub t/ approximately=14 GeV. For t quarks of this mass he finds tau /sub t/<or approximately=1.7*10/sup -17/ sec. and B(t to X mu /sup +/ nu /sub mu /)<or approximately=12%, the equality holding for the absence of nonleptonic enhancement. b-quark cascade decay is found to be an insignificant source of multimuons in nu interactions and suitably small in nu interactions, consistent with the data of the CERN-Dortmund-Heidelberg-Saclay and Harvard-Pennsylvania-Wisconsin- Fermilab collaborations. Several branching ratios for exotic final states produced via b quarks in e/sup +/e/sup -/ annihilation are discussed. (23 refs).