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Article Dans Une Revue Physical Review Letters Année : 2012

Search for New Phenomena in ttbar Events With Large Missing Transverse Momentum in Proton-Proton Collisions at sqrt(s) = 7 TeV with the ATLAS Detector

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) , 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) , L. Aperio Bella (3) , B. Aubert (3) , N. Berger (3) , J. Colas (3) , L. Di Ciaccio (3) , T.K.O. Doan (3) , S. Elles (3) , P. Ghez (3) , M. Gouanère (3) , C. Goy (3) , T. Guillemin (3) , L. Helary (3) , T. Hryn'Ova (3) , G. Ionescu (3) , A. Jérémie (3) , S. Jézéquel (3) , M. Kataoka (3) , J. Labbe (3) , R. Lafaye (3) , J. Leveque (3) , N. Massol (3) , P. Perrodo (3) , H. Przysiezniak (3) , G. Sauvage (3) , E. Sauvan (3) , T. Todorov (3) , D. Tsionou (3) , I. Wingerter-Seez (3) , R. Zitoun (3) , Y. Zolnierowski (3) , Emmanuel Busato (4) , D. Calvet (4) , S. Calvet (4) , Reina Coromoto Camacho Toro (4) , Diane Cinca (4) , R. Febbraro (4) , N. Ghodbane (4) , C. Guicheney (4) , H. Liao (4) , D. Pallin (4) , F. Podlyski (4) , C. Santoni (4) , L. P. Says (4) , F. Vazeille (4) , S. Aoun (5) , C.P. Bee (5) , C. Benchouk (5) , K. Bernardet (5) , N. Bousson (5) , J.C. Clémens (5) , Y. Coadou (5) , P. Delpierre (5) , F. Djama (5) , F. Etienne (5) , L. Feligioni (5) , F. Henry-Couannier (5) , D. Hoffmann (5) , F. Hubaut (5) , E.B. F. G. Knoops (5) , E. Le Guirriec (5) , B. Li (5) , E. Monnier (5) , J. Odier (5) , E. Petit (5) , P. Pralavorio (5) , Z. Qian (5) , A. Rozanov (5) , M. Talby (5) , N. Tannoury (5) , S. Tisserant (5) , J. Toth (5) , F. Touchard (5) , L. Vacavant (5) , T. Beau (6) , S. Bordoni (6) , G. Calderini (6) , A. Camard (6) , P. Cavalleri (6) , E. Chareyre (6) , S. de Cecco (6) , F. Derue (6) , D. Imbault (6) , M.W. Krasny (6) , D. Lacour (6) , B. Laforge (6) , O. Le Dortz (6) , J. Lellouch (6) , G. Marchiori (6) , I. Nikolic-Audit (6) , J. Ocariz (6) , M. Ridel (6) , L. Roos (6) , Ph. Schwemling (6) , Timothée Theveneaux-Pelzer (6) , S. Trincaz-Duvoid (6) , T.N. Trinh (6) , F. Vannucci (7) , H. Abreu (8) , N. Andari (8) , C. Arnault (8) , E. Augé (8) , P. Barrillon (8) , M. Benoit (8) , S. Binet (8) , J.-B. Blanchard (8) , C. Bourdarios (8) , D. Breton (8) , C. Collard (9) , C. de La Taille (8) , J.B. de Vivie de Regie (8) , Sara Diglio (8) , L. Duflot (8) , M. Escalier (8) , A.C. Falou (8) , L. Fayard (8) , D. Fournier (8) , J.-F. Grivaz (8) , M. Heller (8) , S. Henrot-Versillé (8) , J. Hrivnac (8) , L. Iconomidou-Fayard (8) , J. Idarraga (8) , M. Kado (8) , A. Lounis (8) , N. Makovec (8) , P. Matricon (8) , F. Niedercorn (8) , L. Poggioli (8) , P. Puzo (8) , A. Renaud (8) , D. Rousseau (8) , X. Ruan (8, 10) , G. Rybkin (8) , J.B. Sauvan (8) , J. Schaarschmidt (8) , A.C. Schaffer (8) , L. Serin (8) , S. Simion (8) , R. Tanaka (8) , J.J. Veillet (8) , I. Vukotic (8) , F. Wicek (8) , D. Zerwas (8) , Zhiqing Zhang (8)
G. Aad
E. Cogneras
N. Berger
C. Goy
T. Hryn'Ova
S. Calvet
Y. Coadou
F. Vannucci
  • Fonction : Auteur
E. Augé
C. Collard
Sara Diglio
D. Rousseau
Zhiqing Zhang
  • Fonction : Auteur
  • PersonId : 829631

Résumé

A search for new phenomena in ttbar events with large missing transverse momentum in proton-proton collisions at a center-of-mass energy of 7 TeV is presented. The measurement is based on 1.04 fb^-1 of data collected with the ATLAS detector at the LHC. The search is carried out in the single-lepton channel, characterized by an isolated lepton of high transverse momentum, four or more jets and large missing transverse momentum. Contributions to this final state may arise from a number of Standard Model extensions. The results are interpreted in terms of a model where new top-quark partners are pair-produced and each decay to an on-shell top (or antitop) quark and a long-lived undetected neutral particle. The data are found to be consistent with Standard Model expectations. A limit at 95% confidence level is set excluding a cross-section times branching ratio of 1.1 pb for a top-partner mass of 420 GeV and a neutral particle mass less than 10 GeV. In a model of exotic fourth generation quarks, top-partner masses are excluded up to 420 GeV and neutral particle masses up to 140 GeV.
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Dates et versions

in2p3-00628305 , version 1 (21-09-2023)

Identifiants

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G. Aad, S. Albrand, M.L. Andrieux, B. Clement, J. Collot, et al.. Search for New Phenomena in ttbar Events With Large Missing Transverse Momentum in Proton-Proton Collisions at sqrt(s) = 7 TeV with the ATLAS Detector. Physical Review Letters, 2012, 108, pp.041805. ⟨10.1103/PhysRevLett.108.041805⟩. ⟨in2p3-00628305⟩
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