Measurement of the top-quark mass using missing $E_T$+jets events with secondary vertex $b$-tagging at CDF II

We present a measurement of the top-quark mass in $p\bar{p}$ collisions at \hbox{$\sqrt{s}=1.96$} TeV which uses events with an inclusive signature of missing transverse energy and jets. % The event selection is sensitive to $t\bar{t}\to W^{+}b{W}^{-}\bar{b}\to l\nu bq{q}^{\mathrm{\prime }}\bar{b}$ independent of the lepton flavor, and results in a large acceptance for $W\to \tau \nu$ decays. % All-hadronic $t\bar{t}$ decays and events with identified electrons or muons are vetoed to provide a statistically independent sample with respect to all previous measurements. % The top-quark mass is inferred from the distribution of the scalar sum of all jet transverse energies and the missing transverse energy. Using 311 pb${}^{-1}$ of integrated luminosity recorded by the Collider Detector at Fermilab, we measure a top-quark mass $m_t = 172.3 ^{+10.8}_{-9.6}$(stat\mathrm{.})$\pm 10.8$(syst\mathrm{.})GeV\mathrm{/}$c^2$\mathrm{.}Whiletheuncertaintyon$m_t$ is larger than that of other measurements, the result is statistically uncorrelated with those of other methods, and thus can help to reduce the overall $m_t$ uncertainty when combined with other existing measurements.