Measurement of the top quark pair production cross section in pp collisions at sqrt(s) = 7 TeV in dilepton final states with ATLAS

G. Aad , S. Albrand (1) , M.L. Andrieux (1) , B. Clement (1) , J. Collot (1) , S. Crépé-Renaudin (1) , P.A. Delsart (1) , J. Donini (1) , Daniel Dzahini (1) , J.Y. Hostachy (1) , E. Laisne (1) , F. Ledroit-Guillon (1) , A. Lleres (1) , A. Lucotte (1) , F. Malek (1) , P. Martin (1) , F. Polci (1) , J. Stark (1) , X. Sun (1) , B. Trocmé (1) , C. Weydert (1) , C. Biscarat (2) , E. Cogneras (2) , G. Rahal (2) , H. Bachacou (3) , F. Bauer (3) , N. Besson (3) , N.M. Bolnet (3) , M. Boonekamp (3) , L. Chevalier (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) , M. Legendre (3) , B. Lenzi (3) , B. Mansoulie (3) , J.-P. Meyer (3) , N. Morange (3) , E. Mountricha (3) , Thi Hong (3) , R. Nicolaidou (3) , A. Ouraou (3) , D.M. Pomarede (3) , B. Resende (3) , C.R. Royon (3) , Ph. Schune (3) , J. Schwindling (3) , O. Simard (3) , M. Virchaux (3) , C. Xu (3) , J. Yu (3) , H. Abreu (4) , N. Andari (4) , C. Arnault (4) , E. Augé (4) , P. Barrillon (4) , M. Benoit (4) , S. Binet (4) , J.-B. Blanchard (4) , C. Bourdarios (4) , D. Breton (4) , C. Collard (5) , C. de La Taille (4) , J.B. de Vivie de Regie (4) , Sara Diglio (4) , L. Duflot (4) , M. Escalier (4) , A.C. Falou (4) , L. Fayard (4) , D. Fournier (4) , J.-F. Grivaz (4) , M. Heller (4) , S. Henrot-Versillé (4) , J. Hrivnac (4) , L. Iconomidou-Fayard (4) , J. Idarraga (4) , M. Kado (4) , A. Lounis (4) , N. Makovec (4) , P. Matricon (4) , F. Niedercorn (4) , L. Poggioli (4) , P. Puzo (4) , A. Renaud (4) , D. Rousseau (4) , X. Ruan (4) , G. Rybkin (4) , J.B. Sauvan (4) , J. Schaarschmidt (4) , A.C. Schaffer (4) , L. Serin (4) , S. Simion (4) , R. Tanaka (4) , J.J. Veillet (4) , I. Vukotic (4) , F. Wicek (4) , D. Zerwas (4) , Zhiqing Zhang (4) , Emmanuel Busato (6) , D. Calvet (6) , S. Calvet (6) , Reina Coromoto Camacho Toro (6) , Diane Cinca (6) , R. Febbraro (6) , N. Ghodbane (6) , C. Guicheney (6) , D. Pallin (6) , F. Podlyski (6) , C. Santoni (6) , L. P. Says (6) , F. Vazeille (6) , L. Aperio Bella (7) , B. Aubert (7) , N. Berger (7) , J. Colas (7) , L. Di Ciaccio (7) , T.K.O. Doan (7) , S. Elles (7) , P. Ghez (7) , M. Gouanère (7) , C. Goy (7) , T. Guillemin (7) , L. Helary (7) , T. Hryn'Ova (7) , G. Ionescu (7) , A. Jérémie (7) , S. Jézéquel (7) , M. Kataoka (7) , J. Labbe (7) , R. Lafaye (7) , J. Leveque (7) , N. Massol (7) , P. Perrodo (7) , H. Przysiezniak (7) , G. Sauvage (7) , E. Sauvan (7) , T. Todorov (7) , D. Tsionou (7) , I. Wingerter-Seez (7) , R. Zitoun (7) , Y. Zolnierowski (7) , T. Beau (8) , S. Bordoni (8) , G. Calderini (8) , A. Camard (8) , P. Cavalleri (8) , E. Chareyre (8) , S. de Cecco (8) , F. Derue (8) , D. Imbault (8) , M.W. Krasny (8) , D. Lacour (8) , B. Laforge (8) , O. Le Dortz (8) , J. Lellouch (8) , G. Marchiori (8) , I. Nikolic-Audit (8) , J. Ocariz (8) , M. Ridel (8) , L. Roos (8) , Ph. Schwemling (8) , Timothée Theveneaux-Pelzer (8) , S. Trincaz-Duvoid (8) , T.N. Trinh (8) , F. Vannucci (9) , S. Aoun (10) , C.P. Bee (10) , C. Benchouk (10) , K. Bernardet (10) , N. Bousson (10) , J.C. Clémens (10) , Y. Coadou (10) , P. Delpierre (10) , F. Djama (10) , F. Etienne (10) , L. Feligioni (10) , F. Henry-Couannier (10) , D. Hoffmann (10) , F. Hubaut (10) , E. B. F. G. Knoops (10) , E. Le Guirriec (10) , B. Li (10) , E. Monnier (10) , J. Odier (10) , E. Petit (10) , P. Pralavorio (10) , Z. Qian (10) , A. Rozanov (10) , M. Talby (10) , N. Tannoury (10) , S. Tisserant (10) , J. Toth (10) , F. Touchard (10) , L. Vacavant (10)

1 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
2 CC-IN2P3 - Centre de Calcul de l'IN2P3
3 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
4 LAL - Laboratoire de l'Accélérateur Linéaire
5 IPHC - Institut Pluridisciplinaire Hubert Curien
6 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
7 LAPP - Laboratoire d'Annecy de Physique des Particules
8 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
9 APC - Neutrinos
10 CPPM - Centre de Physique des Particules de Marseille

A measurement of the production cross section of top quark pairs (ttbar) in proton-proton collisions at a center-of-mass energy of 7 TeV recorded with the ATLAS detector at the Large Hadron Collider is reported. Candidate events are selected in the dilepton topology with large missing transverse energy and at least two jets. Using a data sample corresponding to an integrated luminosity of 35 pb^-1, a ttbar production cross section of 171 +/- 20(stat.) +/- 14(syst.) +8-6(lum.) pb is measured for an assumed top quark mass of 172.5 GeV. A second measurement requiring at least one jet identified as coming from a b quark yields a comparable result, demonstrating that the dilepton final states are consistent with being accompanied by b-quark jets. These measurements are in good agreement with Standard Model predictions.

Domaines: Physique des Hautes Energies - Expérience [hep-ex]

G. Aad, S. Albrand, M.L. Andrieux, B. Clement, J. Collot, et al.. Measurement of the top quark pair production cross section in pp collisions at sqrt(s) = 7 TeV in dilepton final states with ATLAS. Physics Letters B, 2012, 707, pp.459-477. ⟨10.1016/j.physletb.2011.12.055⟩. ⟨in2p3-00615427⟩