Abstract

The top quark, the heaviest known elementary particle discovered at the Fermilab Tevatron almost twenty years ago, has taken a central role in the study of fundamental interactions. The top quark behaves differently from all other quarks due to its large mass and its correspondingly short lifetime. Its large mass suggests that it may play a special role in nature. The top quark decays before it hadronizes, passing its spin information on to its decay products. Therefore, it is possible to measure observables that depend on the top quark spin, providing a unique environment for tests of the standard model and for new physics searches. With approximately 10 fb−1 of luminosity delivered to each experiment at the Tevatron, and about 20 fb−1 collected by the ATLAS and CMS experiments at the Large Hadron Collider in the first three years of operation, top quark physics is at a turning point from first studies to precision measurements with sensitivity to new physics processes. This report summarizes the latest experimental measurements and studies of top quark properties and rare decays.

Highlights

  • The long search for the top quark engaged researchers at laboratories around the world for many years, and came to a successful conclusion in February 1995 with the announcement that the top quark had been observed in two experiments at the Tevatron proton-antiproton collider at Fermilab [1]

  • Measurement of the inclusive top quark pair production cross section have been performed at the Large Hadron Collider (LHC) in the dilepton and lepton+jet channels using electrons and muons and provide the most precise results

  • Thanks to the large samples of top quarks available, stringent selections and improved analysis techniques, and to an excellent performance and good understanding of the detectors, the precision of the LHC measurements are close to the precision reached at the Tevatron already after the first few years of data-taking [8]

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Summary

Introduction

The long search for the top quark engaged researchers at laboratories around the world for many years, and came to a successful conclusion in February 1995 with the announcement that the top quark had been observed in two experiments at the Tevatron proton-antiproton collider at Fermilab [1]. The production cross section has been measured in many different final states. The all-hadronic final state has an experimental signature with at least 6 jets, of which two are from bottom quarks, with a large background, doi:10.1088/1742-6596/447/1/012012

Results
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