  The inclusive cross section of top quark-antiquark pairs produced in
$p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV is measured in the lepton$+$jets
and dilepton decay channels. The data sample corresponds to 9.7 fb${}^{-1}$ of
integrated luminosity recorded with the D0 detector during Run II of the
Fermilab Tevatron Collider. Employing multivariate analysis techniques we
measure the cross section in the two decay channels and we perform a combined
cross section measurement. For a top quark mass of 172.5 GeV, we measure a
combined inclusive top quark-antiquark pair production cross section of
$\sigma_{t\bar{t}} = 7.26 \pm
0.13\,(\mathrm{stat.})\,^{+0.57}_{-0.50}\,(\mathrm{syst.})$ pb which is
consistent with standard model predictions. We also perform a likelihood fit to
the measured and predicted top quark mass dependence of the inclusive cross
section, which yields a measurement of the pole mass of the top quark. The
extracted value is $m_t = 172.8 \pm
1.1\,(\mathrm{theo.})\,^{+3.3}_{-3.1}\,(\mathrm{exp.})$ GeV.
