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We use the strong coupling and hopping parameter expansions to calculate thepion and rho meson masses for lattice Yang-Mills gauge theories with fermionsin irreducible two-index representations, namely the adjoint, symmetric andantisymmetric. The results are found to be consistent with orientifold planarequivalence, and leading order 1/N corrections are calculated in the latticephase. An estimate of the critical bare mass, for which the pion is massless,is obtained as a function of the bare coupling. A comparison to data from thetwo-flavour SU(2) theory with adjoint fermions gives evidence for a bulk phasetransition at beta~2, separating a pure lattice phase from a phase smoothlyconnected to the continuum.

Spectrum of orientifold QCD in the strong coupling and hopping expansion approximation