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Measurement of the top-quark mass in the fully hadronic decay channel from ATLAS data at √s = 7 TeV

CollaborationWith : Alexandre, Gauthier / Ancu, Lucian Stefan / Barone, Gaetano / Bell, Paul / Bell, William / Benhar Noccioli, Eleonora / Bilbao De Mendizabal, Javier / Bucci, Francesca / Camacho Toro, Reina / Clark, Allan Geoffrey / Delitzsch, Chris Malena / Della Volpe, Domenico / Doglioni, Caterina / Ferrere, Didier / Gadomski, Szymon / Gonzalez Sevilla, Sergio / Goulette, Marc / Gramling, Johanna Léna / Guescini, Francesco / Iacobucci, Giuseppe / Katre, Akshay / La Rosa, Alessandro / Mermod, Philippe / Miucci, Antonio / Muenstermann, Daniel / Nektarijevic, Snezana / Nikolics, Katalin / Picazio, Attilio / Pohl, Martin / Rosbach, Kilian / Tykhonov, Andrii / Vallecorsa, Sofia / Wu, Xin
Published in European Physical Journal. C. 2015, vol. 75, no. 4, p. 158
Collection Open Access - SCOAP3
Abstract The mass of the top quark is measured in a data set corresponding to 4.6  fb-1 of proton–proton collisions with centre-of-mass energy √s = 8 TeV collected by the ATLAS detector at the LHC. Events consistent with hadronic decays of top–antitop quark pairs with at least six jets in the final state are selected. The substantial background from multijet production is modelled with data-driven methods that utilise the number of identified b -quark jets and the transverse momentum of the sixth leading jet, which have minimal correlation. The top-quark mass is obtained from template fits to the ratio of three-jet to dijet mass. The three-jet mass is calculated from the three jets produced in a top-quark decay. Using these three jets the dijet mass is obtained from the two jets produced in the W boson decay. The top-quark mass obtained from this fit is thus less sensitive to the uncertainty in the energy measurement of the jets. A binned likelihood fit yields a top-quark mass of mt=175.1±1.4(stat.)±1.2(syst.)GeV.
Keywords ATLASLHCProton–proton collisionsTop quarkTop-quark massFully hadronic
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ATLAS COLLABORATION. Measurement of the top-quark mass in the fully hadronic decay channel from ATLAS data at √s = 7 TeV. In: European Physical Journal. C, 2015, vol. 75, n° 4, p. 158. https://archive-ouverte.unige.ch/unige:56024

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Deposited on : 2015-05-04

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