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

TL;DR

This paper measures the top-quark mass using events with missing transverse energy and jets, employing secondary vertex b-tagging at CDF II, providing an independent estimate that can improve combined precision.

Contribution

It introduces a novel measurement method based on missing energy and jets, independent of lepton detection, expanding the approaches for top-quark mass determination.

Findings

Measured top-quark mass: 172.3 GeV/c^2

Uncertainty: approximately 10 GeV/c^2

Result is statistically uncorrelated with other methods.

Abstract

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 $t\bar t\to W^+bW^-\bar b\to l\nu b q q^\prime \bar b$ 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.)$\pm 10.8$(syst.) GeV/$c^2$. While the uncertainty on $m_t$ 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.