Possible effects from physics beyond the Standard Model have been
investigated in top quark decays from a data sample enriched in tt-bar
events produced in p anti-p collisions at s**(1/2) = 1.96 TeV with an integrated
luminosity of approximately 700 pb-1 and collected with the CDF II
detector.

The combined tt-bar production cross section measurement 7.3 +/- 0.9 pb
agrees with the QCD NLO predictions: 6.7 +/- 0.8 pb assuming m_top = 175
GeV/c2.

The fraction of the V + A current in top quark decay, f_V + A, is determined
using the invariant mass of the charged lepton and the bottom quark jet in
the decay chain t --> Wb --> l nu b (where l = e or mu).  The measured value
f_V +A = -0.006 +/- 0.25 under the assumption m_top = 175 GeV/c2 is in
agreement with the Standard Model.  We set an upper limit on f_V + A of 0.29
at the 95% confidence level.