Dynamical contribution to isospin symmetry breaking and see saw mechanism in extended technicolor

We study the possibility of breaking isospin in an extended technicolor model with left-right symmetric gauge group SU(2)L o SU(2)R o SU(4)C o SO(N)ETC. The model contains two sectors of technicolor embedded in SO(N)ETC. One of these sectors, called meta color, gives rise to a Majorana type condensate which in turns induces large Majorana masses for right handed neutrinos through the ETC interactions. The other technicolor sector generates Dirac type condensates. A dynamical see saw mechanism is implemented in a natural way , and an isospin breaking is generated in the leptonic sector. This isospin breaking is transmitted to the ordinary quark sector through two loop diagrams involving extended technicolor and SU(4)C gauge fields. For the leptonic sector we can accommodate a realistic spectrum of masses. However for the quark sector the transmission of isospin breaking is not enough to generate the known isospin splitting between members of an iso doublet. This situation in the quark sector may be improved by combining it with some other ideas of isospin splitting. (Author)