Composite Higgs bosons in the Nambu-Jona-Lasinio model

If more than one doublet of composite Higgs bosons is formed with quarks and antiquarks alone in the Nambu-Jona-Lasinio model, their couplings to quarks are subject to interesting constraints. The Higgs doublets orthogonal to the linear combination responsible for mass generation almost decouple with the right-handed $t$ quark, but couple with one or more of the right-handed $u$, $d$, $s$, $c$, and $b$ quarks with Yukawa coupling constants of order 1. If there are only two light doublets, the doublet orthogonal to the mass-generating combination is likely to couple with the right-handed $b$ quark with a Yukawa coupling constant $\simeq \frac{m_t}{v}$.