  In the standard model, the Cabibbo-Kobayashi-Maskawa matrix, which
incorporates the time-reversal violation shown by the charged current weak
interactions, originates from the Higgs-quark interactions. The Yukawa
interactions of quarks with the physical Higgs particle can contain further
complex phase factors, but nevertheless conserve T, as shown by constructing
the fermion T transformation and the invariant euclidean fermion measure.
