Acta Physica Polonica. B, 2001, no. 11, s. 3783-3796
A few physical examples are discussed which illustrate a role of fermion
masses in the Standard Model predictions for reactions which will be measured
at future linear colliders. Taking into account nonzero fermion masses
is important not only in the context of the Higgs boson, or the top quark
pair production and decay. The mass effects may also become numerically
sizable for reactions involving light fermion flavours only. It is interesting
that the mass effects do not always disappear in the presence of cuts.
In some situations, the cuts may even enlarge the mass effect or make it
inverse, i. e. stronger for lighter fermion flavours than for heavier ones.