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Measurement of the top quark-pair production cross section with ATLAS in pp collisions at $\sqrt{s}=7\TeV$

G. Aad L. Aperio Bella 1 B. Aubert 1 M. Aurousseau 1 N. Berger 1 J. Colas 1 L. Di Ciaccio 1 M. El Kacimi 1 S. Elles 1 P. Ghez 1 M. Gouanère 1 C. Goy 1 T. Guillemin 1 L. Helary 1 T. Hryn'Ova 1 P. Iengo 1 A. Jérémie 1 S. Jézéquel 1 J. Labbe 1 R. Lafaye 1 N. Massol 1 P. Perrodo 1 H. Przysiezniak 1 G. Sauvage 1 T. Todorov 1 I. Wingerter-Seez 1 R. Zitoun 1 Y. Zolnierowski 1 C. Biscarat 2 E. Cogneras 2 G. Rahal 2 H. Bachacou 3 F. Bauer 3 N. Besson 3 M. Boonekamp 3 L. Chevalier 3 F. Chevallier 3 J. Ernwein 3 A.I. Etienvre 3 A. Formica 3 L. Gauthier 3 F. Giraud 3 C. Guyot 3 S. Hassani 3 W. Kozanecki 3 E. Lancon 3 J.F. Laporte 3 E. Le Menedeu 3 B. Lenzi 3 B. Mansoulie 3 J.-P. Meyer 3 N. Morange 3 R. Nicolaidou 3 A. Ouraou 3 D.M. Pomarede 3 B. Resende 3 C.R. Royon 3 Ph. Schune 3 J. Schwindling 3 M. Virchaux 3 T.K.O. Doan 1 S. Albrand M.L. Andrieux 4 M. Belhorma 4 B. Clement 4 J. Collot 4 S. Crépé-Renaudin 4 P. de Saintignon 4 P.A. Delsart 4 J. Donini 4 D. Dzahini 4 J.Y. Hostachy 4 E. Laisne 4 F. Ledroit-Guillon 4 A. Lleres 4 A. Lucotte 4 F. Malek 4 P. Martin 4 F. Polci 4 J. Stark 4 X. Sun 4 B. Trocmé 4 S. Aoun 5 C. Bee 5 C. Benchouk 5 K. Bernardet 5 N. Boussons C. Cerna 5 J. C. Clémens 5 Y. Coadou 5 S. Correard 5 P. Delpierre 5 F. Etienne 5 F. Henry-Couannier 5 D. Hoffmann 5 F. Hubaut 5 M. Kuna 5 Le Guirriec 5 Jérémy Lévêque 5 B. Li 5 E. Monnier 5 J. Odier 5 E. Petit 5 P. Pralavorio 5 Z. Qian 5 A. Rozanov 5 N. Tannoury 5 J. Toth 5 F. Touchard 5 L. Vacavant 5 H. Abreu 6 N. Andari 6 C. Arnault 6 E. Augé 6 P. Barrillon 6 M. Benoit 6 S. Binet 6 J.-B. Blanchard 6 C. Bourdarios 6 D. Breton 6 C. Collard 7 C. de la Taille 6 J.B. de Vivie de Regie 6 S. Diglio 6 L. Duflot 6 M. Escalier 6 A.C. Falou 6 L. Fayard 6 D. Fournier 6 J.-F. Grivaz 6 M. Heller 6 S. Henrot-Versillé 6 J. Hrivnac 6 L. Iconomidou-Fayard 6 J. Idarraga 6 M. Kado 6 A. Lounis 6 N. Makovec 6 P. Matricon 6 F. Niedercorn 6 L. Poggioli 6 P. Puzo 6 A. Renaud 6 D. Rousseau 6 X. Ruan 6, 8 G. Rybkin 6 J.B. Sauvan 6 J. Schaarschmidt 6 A.C. Schaffer 6 L. Serin 6 S. Simion 6 R. Tanaka 6 J.J. Veillet 6 I. Vukotic 6 F. Wicek 6 D. Zerwas 6 Zhiqing Zhang 6
Abstract : A measurement of the production cross-section for top quark pairs($\ttbar$) in $pp$ collisions at $\sqrt{s}=7 \TeV$ is presented using data recorded with the ATLAS detector at the Large Hadron Collider. Events are selected in two different topologies: single lepton (electron $e$ or muon $\mu$) with large missing transverse energy and at least four jets, and dilepton ($ee$, $\mu\mu$ or $e\mu$) with large missing transverse energy and at least two jets. In a data sample of 2.9 pb-1, 37 candidate events are observed in the single-lepton topology and 9 events in the dilepton topology. The corresponding expected backgrounds from non-$\ttbar$ Standard Model processes are estimated using data-driven methods and determined to be $12.2 \pm 3.9$ events and $2.5 \pm 0.6$ events, respectively. The kinematic properties of the selected events are consistent with SM $\ttbar$ production. The inclusive top quark pair production cross-section is measured to be $\sigmattbar=145 \pm 31 ^{+42}_{-27}$ pb where the first uncertainty is statistical and the second systematic. The measurement agrees with perturbative QCD calculations.
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Submitted on : Friday, January 7, 2011 - 3:01:14 PM
Last modification on : Wednesday, September 16, 2020 - 4:23:20 PM

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G. Aad, L. Aperio Bella, B. Aubert, M. Aurousseau, N. Berger, et al.. Measurement of the top quark-pair production cross section with ATLAS in pp collisions at $\sqrt{s}=7\TeV$. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2011, 71, pp.1577. ⟨10.1140/epjc/s10052-011-1577-6⟩. ⟨in2p3-00553524⟩

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