Observation of Single Top Quark Production at the Tevatron

TL;DR

This paper reports the first unambiguous observation of single top quark production at the Tevatron, confirming electroweak theory predictions through sophisticated data analysis and cross section measurements.

Contribution

It provides the first experimental observation of electroweak single top quark production with precise cross section measurements from DZero and CDF collaborations.

Findings

Measured cross sections consistent with theoretical predictions

Achieved 5 sigma significance for observation

Demonstrated advanced multivariate analysis techniques

Abstract

This paper reports on the first observation of electroweak production of single top quarks by the DZero and CDF collaborations. At Fermilab's 1.96 TeV proton-antiproton collider, a few thousand events are selected from several inverse femtobarns of data that contain an isolated electron or muon and/or missing transverse energy, together with jets that originate from the decays of b quarks. Using sophisticated multivariate analyses to separate signal from background, the DZero collaboration measures a cross section sigma(ppbar->tb+X,tqb+X) = 3.94 +- 0.88 pb (for a top quark mass of 170 GeV) and the CDF collaboration measures a value of 2.3_0.6 -0.5 pb (for a top quark mass of 175 GeV). These values are consistent with theoretical predictions at next-to-leading order precision. Both measurements have a significance of 5.0 standard deviations, meeting the benchmark to be considered unambiguous observation.