Abstract
We discuss the problem of obtaining a realistic spectrum of quark and lepton masses in extended technicolor (ETC), without inducing excessive flavour-changing neutral currents (FCNCs) and without leading to excessive deviations in the p-parameter. We concentrate on a conventional ETC model (i.e. without the assumption of a fixed point, and which does not involve the unnatural adjustment of any parameter), but which involves a rather unconventional pattern of symmetry breaking. This model, called chirally extended technicolor ( ξ ETC), which was recently proposed by one of us, is studied in full detail using Schwinger-Dyson equations in dressed ladder approximation, which are solved numerically. Our results show that this model provides a realistic description of quark and lepton masses without inducing excessive FCNCs and with δϱ ≈ 1.0–1.7% for a top quark mass in the range m t ≈ 100–125 GeV.
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