Publication: Determination of the Top-Quark Pole Mass Using T T + 1-Jet Events Collected With the ATLAS Experiment in 7 TeV Pp Collisions
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2015-10
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Springer Science and Business Media LLC
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ATLAS Collaboration. 2015. Determination of the Top-Quark Pole Mass Using T T + 1-Jet Events Collected With the ATLAS Experiment in 7 TeV Pp Collisions. Journal of High Energy Physics 121.
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Abstract
The normalized differential cross section for top-quark pair production in association with at least one jet is studied as a function of the inverse of the invariant mass of the ����⎯⎯+ 1-jet system. This distribution can be used for a precise determination of the top-quark mass since gluon radiation depends on the mass of the quarks. The experimental analysis is based on proton-proton collision data collected by the ATLAS detector at the LHC with a centre-of-mass energy of 7 TeV corresponding to an integrated luminosity of 4.6 fb−1. The selected events were identified using the lepton+jets top-quark-pair decay channel, where lepton refers to either an electron or a muon. The observed distribution is compared to a theoretical prediction at next-to-leading-order accuracy in quantum chromodynamics using the pole-mass scheme. With this method, the measured value of the top-quark pole mass, m pole t , is:
��pole��=173.7±1.5(stat.)±1.4(syst.)+1.0−0.5(theory)GeV.
This result represents the most precise measurement of the top-quark pole mass to date.
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Nuclear and High Energy Physics
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