2014/02/26 by T. Aaltonen, CDF Collaboration, Aaltonen, T. +824 · 1 citation
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.48550/arxiv.1402.6728
8 pages, 5 figures accepted by Phys. Rev. D
openalex publication_date 2014/02/26 · arxiv created 2014/04/22 · arxiv updated 2014/04/23 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28
We present an analysis of top-antitop quark production and decay into a tau lepton, tau neutrino, and bottom quark using data from 9 \rm fb-1 of integrated luminosity at the Collider Detector at Fermilab. Dilepton events, where one lepton is an energetic electron or muon and the other a hadronically-decaying tau lepton, originating from proton-antiproton collisions at √(s) = 1.96 TeV are used. A top-antitop quark production cross section of 8.1 ± 2.1 \rm pb is measured, assuming standard-model top-quark decays. By separately identifying for the first time the single-tau and the ditau components, we measure the branching fraction of the top quark into tau lepton, tau neutrino, and bottom quark to be (9.6 ± 2.8) %. The branching fraction of top-quark decays into a charged Higgs boson and a bottom quark, which would imply violation of lepton universality, is limited to be less than 5.9% at 95% confidence level.