Fully hadronic tt cross section with the ATLAS detector
Andrea Coccaro (on behalf of the ATLAS collaboration)
TL;DR
This paper reports a measurement of the top-antitop quark pair production cross section in the all-hadronic decay channel using ATLAS data at 7 TeV, employing advanced event selection and reconstruction techniques.
Contribution
It presents a novel measurement of the tt cross section in the all-hadronic mode with improved event reconstruction and analysis methods.
Findings
Measured cross section agrees with Standard Model predictions.
Used 4.7 fb-1 of data at 7 TeV.
Applied kinematic fit for event reconstruction.
Abstract
A measurement of the tt production cross section in the all-hadronic decay mode is presented using 4.7 fb-1 of proton-proton collisions at a centre of mass energy of 7 TeV collected by the ATLAS experiment in 2011. Events are selected using a multi-jet trigger. Kinematic and b-tagging requirements are then applied to identify tt event candidates. A kinematic fit reconstructs the event topology of the final state extracting the top-quark mass which is then used to measure the production cross section with an unbinned likelihood fit. The result is found in good agreement with the Standard Model prediction for a top-quark mass of 172.5 GeV.
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