Evidence for Production of Single Top Quarks and First Direct Measurement of|Vtb|

2006/12/31 by D0 Collaboration, V. M. Abazov, B. Abbott +98 · 6 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.1103/physrevlett.98.181802

published as Phys.Rev.Lett.98:181802,2007 · This version accepted for publication by PRL

arxiv created 2007/04/10 · openalex publication_date 2007/05/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04

Abstract

The D0 Collaboration presents first evidence for the production of single top quarks at the Fermilab Tevatron pp collider. Using a 0.9 fb^\ensuremath-1 dataset, we apply a multivariate analysis to separate signal from background and measure \ensuremathσ(pp\ensuremath→tb+X,tqb+X)=4.9\ifmmode±\else\textpm\fi1.4 pb. The probability to measure a cross section at this value or higher in the absence of a signal is 0.035%, corresponding to a 3.4 standard deviation significance. We use the cross section measurement to directly determine the Cabibbo-Kobayashi-Maskawa matrix element that describes the Wtb coupling and find 0.68<|V_tb|\ensuremath≤1 at 95% C.L. within the standard model.

Citations

• Observation of the Top Quark
• Observation of Top Quark Production in Pbar-P Collisions
• The Upgraded D0 Detector
• ALPGEN, a generator for hard multiparton processes in hadronic collisions
• Boosted decision trees as an alternative to artificial neural networks for particle identification
• CP-Violation in the Renormalizable Theory of Weak Interaction

Cited by

• Theoretical top quark cross section at the Fermilab Tevatron and the CERN LHC
• Search for Top-Quark Production via Flavor-Changing Neutral Currents inW+1Jet Events at CDF
• Measurement of the Single-Top-Quark Production Cross Section at CDF
• Strongly coupled fourth generation at the LHC
• Cascade training technique for particle identification
• Anomalous resonant production of the fourth-family up-type quarks at the LHC
• Measurement of the t-channel single top quark production cross section