2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/47123We discuss the sensitivity of the processes e+e- to b b(bar), e+e- to t t(bar) and gamma gamma to H to certain residual New Physics interactions affecting the heavy quark and Higgs boson sector. With a linear collider of 500 GeV, one should be able to detect and identify such effects with a characteristic scale up to 50 TeV.11 pages and 2 figures. e-mail: renard@lpmsun2.lpm.univ-montp2.frHigh Energy Physics - Phenomenologytext