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Measurement of the top-quark mass in the fully hadronic decay channel from ATLAS data at $\sqrt{s}=7$ TeV

G. Aad 1 L. Alio 1 M. Barbero 1 C. Bertella 1 J. C. Clémens 1 Y. Coadou 1 S. Diglio 1 F. Djama 1 L. Feligioni 1 D. Hoffmann 1 F. Hubaut 1 E. B. F. G. Knoops 1 E. Le Guirriec 1 B. Li 1 D. Madaffari 1 K. Mochizuki 1 E. Monnier 1 S. Muanza 1 Y. Nagai 1 P. Pralavorio 1 A. Rozanov 1 T. Serre 1 M. Talby 1 E. Tiouchichine 1 S. Tisserant 1 J. Toth 1 F. Touchard 1 M. Ughetto 1 L. Vacavant 1 H. Bachaou 2 F. Balli 2 F. Bauer 2 N. Besson 2 J.-B. Blanchard 2 M. Boonekamp 2 A. Calandri 2 L. Chevalier 2 M. Dano Hoffmann 2 F. Deliot 2 J. Ernwein 2 A.I. Etienvre 2 A. Formica 2 P.F. Giraud 2 J. Goncalves Pinto Firmino da Costa 2 H.M.X. Grabas 2 C. Guyot 2 R. Hanna 2 S. Hassani 2 W. Kozanecki 2 E. Lancon 2 J.F. Laporte 2 C. Maiani 2 P. Mal 2 B. Mansoulie 2 H. Martinez 3 N. Meric 2 J.-P. Meyer 2 R. Nicolaidou 2 A. Ouraou 2 E. Protopapadaki 2 C.R. Royon 2 L. L. Schoffel 2 Ph. Schune 2 Ph. Schwemling 2 J. Schwindling 2 D. Tsionou 2 N. Vranjes 2 M. Xiao 2 D. Boumediene 3 Emmanuel Busato 3 D. Calvet 3 S. Calvet 3 J. Donini 3 E. Dubreuil 3 N. Ghodbane 3 G. Gilles 3 Ph. Gris 3 C. Guicheney 3 H. Liao 3 D. Pallin 3 Daniela Paredes Hernández 3 F. Podlyski 3 C. Santoni 3 Timothée Theveneaux-Pelzer 3 Loïc Valery 3 F. Vazeille 3 G. Rahal 4 T. Beau 5 M. Bomben 5 G. Calderini 5 F. Crescioli 5 O. Davignon 5 S. de Cecco 5 A. Demilly 5 F. Derue 5 P. Francavilla 5 M.W. Krasny 5 D. Lacour 5 B. Laforge 5 S. Laplace 5 O. Le Dortz 5 G. Lefebvre 5 B. Malaescu 5 G. Marchiori 5 I. Nikolic-Audit 5 J. Ocariz 5 S. Pires 5 M. Ridel 5 L. Roos 5 S. Trincaz-Duvoid 5 F. Vannucci 5 D. Varouchas 5 Z. Barnovska 6 N. Berger 6 M. Delmastro 6 L. Di Ciaccio 6 T.K.O. Doan 6 S. Elles 6 C. Goy 6 T. Hryn'Ova 6 S. Jézéquel 6 H. Keoshkerian 6 I. Koletsou 6 R. Lafaye 6 J. Leveque 6 V.P. Lombardo 6 N. Massol 6 H. Przysiezniak 6 G. Sauvage 6 E. Sauvan 6 M. Schwoerer 6 O. Simard 6 T. Todorov 6 I. Wingerter-Seez 6 S. Albrand 7 J. Brown 7 J. Collot 7 S. Crépé-Renaudin 7 B. Dechenaux 7 P.A. Delsart 7 C. Gabaldon 7 M.H. Genest 7 J.Y. Hostachy 7 F. Ledroit-Guillon 7 A. Lleres 7 A. Lucotte 7 F. Malek 7 C. Monini 7 J. Stark 7 B. Trocmé 7 M. Wu 7 S. Abdel Khalek 8 A. Bassalat 8 C. Becot 8 S. Binet 8 C. Bourdarios 8 D. Charfeddine 8 J.B. de Vivie de Regie 8 L. Duflot 8 M. Escalier 8 L. Fayard 8 D. Fournier 8 J.-F. Grivaz 8 T. Guillemin 8 F. Hariri 8 S. Henrot-Versillé 8 J. Hrivnac 8 L. Iconomidou-Fayard 8 M. Kado 8 A. Lounis 8 N. Makovec 8 L. Poggioli 8 P. Puzo 8 A. Renaud 8 D. Rousseau 8 G. Rybkin 8 A.C. Schaffer 8 E. Scifo 8 L. Serin 8 S. Simion 8 R. Tanaka 8 H.L. Tran 8 D. Zerwas 8 Zhongkai Zhang 8
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 $\sqrt{s}=7$ 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 multijetproduction 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 $m_{t} = 175.1 \pm 1.4$ (stat) $\pm 1.2$ (syst) GeV.
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G. Aad, L. Alio, M. Barbero, C. Bertella, J. C. Clémens, et al.. Measurement of the top-quark mass in the fully hadronic decay channel from ATLAS data at $\sqrt{s}=7$ TeV. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2015, 75 (4), pp.158. ⟨10.1140/epjc/s10052-015-3373-1⟩. ⟨in2p3-01060227⟩

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