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Determination of the top-quark pole mass using t t ¯ $$ t\overline{t} $$ + 1-jet events collected with the ATLAS experiment in 7 TeV pp collisions

CollaborationWith : Ancu, Lucian Stefan / Barone, Gaetano / Bell, Paul / Bell, William / Benhar Noccioli, Eleonora / Bilbao De Mendizabal, Javier / Camacho Toro, Reina / Clark, Allan Geoffrey / Delitzsch, Chris Malena / Della Volpe, Domenico / Doglioni, Caterina / Ferrere, Didier / Gadomski, Szymon / Golling, Tobias / Gonzalez Sevilla, Sergio / Gramling, Johanna Léna / Guescini, Francesco / Iacobucci, Giuseppe / Katre, Akshay / La Rosa, Alessandro / Mermod, Philippe / Miucci, Antonio / Muenstermann, Daniel / Nessi, Marzio / Picazio, Attilio / Ristic, Branislav / Tykhonov, Andrii / Vallecorsa, Sofia / Wu, Xin
Published in . 2015, vol. 1510, p. 121-162
Collection Open Access - SCOAP3
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 t t ¯ $$ t\overline{t} $$ + 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 t pole , is: m t pole = 173.7 ± 1.5 stat . ± 1.4 syst . − 0.5 + 1.0 theory GeV . $$ {m}_t^{\mathrm{pole}}=173.7\pm 1.5\left(\mathrm{stat}.\right)\pm 1.4{\left(\mathrm{syst}.\right)}_{-0.5}^{+1.0}\left(\mathrm{theory}\right)\mathrm{GeV}. $$
Keywords Hadron-Hadron ScatteringTop physics
arXiv: 1507.01769
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ATLAS COLLABORATION. Determination of the top-quark pole mass using t t ¯ $$ t\overline{t} $$ + 1-jet events collected with the ATLAS experiment in 7 TeV pp collisions. In: Journal of High Energy Physics, 2015, vol. 1510, p. 121-162. doi: 10.1007/JHEP10(2015)121 https://archive-ouverte.unige.ch/unige:77270

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Deposited on : 2015-11-13

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