In this thesis, the first determination of the electric charge of the top\nquark is presented using 370pb-1 of data recorded by the D0 detector at the\nFermilab Tevatron accelerator. ttbar events are selected with one isolated\nelectron or muon and at least four jets out of which two ...
Is it the top quarkof the Standard Model (SM) with electric charge 2/3 or is it an exotic quarkwith charge -4/3? An exotic quark has been proposed by D. Chang etal.\cite{hep-ph/9810531, hep-ph/9805273}. This analysis will use the standardCDF run II dilepton sample. The key ...
chargeofthetopquark.Weanalyzethecontributionsof ¯ ttγproductionand radiativetopquarkdecaystopp (−) →γℓ ± ν ¯ bbjj,assumingthatbothb-quarks aretagged.With20fb −1 attheTevatron,thepossibilitythatthe“topquark” discoveredinRunIisactuallyanexoticcharge−4/3quarkcanberuledout ...
As a result, the asymmetry between the $t$ and $\\bar t$ generated at NLO in QCD is significantly larger than that of inclusive $t \\bar t$ production, which is dominated by gluon fusion. Second, the top quarks tend to inherit the polarization of the initial-state quarks as induced ...
QCD predicts that quarks carry a "color charge," mimicking the familiar electrical charge, which is the source of the force binding them together and is carried by gluons, force particles analogous to the photons of electromagnetism.Andrew Watson, Science, 22 Jan. 1999 A blue quark will bind ...
We report on a measurement of the forward-backward charge asymmetry in e+e- --> qqBAR at KEK TRISTAN, where. the asymmetry is near maximum. We sum over all flavors and measure the asymmetry by determining the charge of the quark jets. In addition we exploit flavor dependencies in the je...
Measurement of the charge asymmetry in dileptonic decays of top quark pairs in pp collisions at s = 7 TeV using the ATLAS detectordoi:10.1007/JHEP05(2015)061Hadron-Hadron ScatteringTop physicsA measurement of the top-antitoptt\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage...
ATLAS Collaboration, Measurement of the charge asymmetry in top quark pair production in pp collisions at \(\sqrt{s} = 7~\mbox{TeV}\) using the ... G Aad,B Abbott,J Abdallah,... - 《European Physical Journal C》 被引量: 144发表: 2012年 Measurement of the charge asymmetry in top ...
1 Introduction Since the discovery of the top quark, its properties and inter- actions have been characterized in some detail. Run I of the LHC, with a top quark pair production of several million events, is extending the programme initiated at the Tevatron in several ways. The larger center...
The measurements are performed using events with two oppositely charged leptons (electrons or muons) and two or more jets, where at least one of the jets is identified as originating from a bottom quark. The charge asymmetry is measured from differences in kinematic distributions, unfolded to the...