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Inclusive search for same-sign dilepton signatures in pp 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. de Saintignon 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 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 S. Aoun 4 C. P. Bee 4 C. Benchouk 4 K. Bernardet 4 N. Bousson 4 J. C. Clémens 4 Y. Coadou 4 P. Delpierre 4 F. Djama 4 F. Etienne 4 L. Feligioni 4 F. Henry-Couannier 4 D. Hoffmann 4 F. Hubaut 4 E.B. F. G. Knoops 4 E. Le Guirriec 4 B. Li 4 E. Monnier 4 J. Odier 4 E. Petit 4 P. Pralavorio 4 Z. Qian 4 A. Rozanov 4 M. Talby 4 N. Tannoury 4 S. Tisserant 4 J. Toth 4 F. Touchard 4 L. Vacavant 4 Emmanuel Busato 5 D. Calvet 5 S. Calvet 5 Reina Coromoto Camacho Toro 5 Diane Cinca 6 R. Febbraro 5 N. Ghodbane 5 C. Guicheney 5 D. Pallin 5 F. Podlyski 5 C. Santoni 5 L. P. Says 5 F. Vazeille 5 S. Viret 5 H. Abreu 7 N. Andari 7 C. Arnault 7 E. Augé 7 P. Barrillon 7 M. Benoit 7 S. Binet 7 J.-B. Blanchard 7 C. Bourdarios 7 D. Breton 7 C. Collard 8 C. de la Taille 7 J.B. de Vivie de Regie 7 S. Diglio 7 L. Duflot 7 M. Escalier 7 A.C. Falou 7 L. Fayard 7 D. Fournier 7 J.-F. Grivaz 7 M. Heller 7 S. Henrot-Versillé 7 J. Hrivnac 7 L. Iconomidou-Fayard 7 J. Idarraga 7 M. Kado 7 A. Lounis 7 N. Makovec 7 P. Matricon 7 F. Niedercorn 7 L. Poggioli 7 P. Puzo 7 A. Renaud 7 D. Rousseau 7 X. Ruan 7 G. Rybkin 7 J.B. Sauvan 7 J. Schaarschmidt 7 A.C. Schaffer 7 L. Serin 7 S. Simion 7 R. Tanaka 7 J.J. Veillet 7 I. Vukotic 7 F. Wicek 7 D. Zerwas 7 Zhiqing Zhang 7 L. Aperio Bella 9 B. Aubert 9 N. Berger 9 J. Colas 9 L. Di Ciaccio 9 T.K.O. Doan 9 S. Elles 9 P. Ghez 9 M. Gouanère 9 C. Goy 9 T. Guillemin 9 L. Helary 9 T. Hryn'Ova 9 G. Ionescu 9 A. Jérémie 9 S. Jézéquel 9 M. Kataoka 9 J. Labbe 9 R. Lafaye 9 J. Leveque 9 N. Massol 9 P. Perrodo 9 H. Przysiezniak 9 G. Sauvage 9 E. Sauvan 9 T. Todorov 9 D. Tsionou 9 I. Wingerter-Seez 9 R. Zitoun 9 Y. Zolnierowski 9 T. Beau 10 S. Bordoni 10 G. Calderini 10 A. Camard 10 P. Cavalleri 10 E. Chareyre 10 S. de Cecco 10 F. Derue 10 D. Imbault 10 M.W. Krasny 10 D. Lacour 10 B. Laforge 10 O. Le Dortz 10 J. Lellouch 10 G. Marchiori 10 I. Nikolic-Audit 10 J. Ocariz 10 M. Ridel 10 L. Roos 10 Ph. Schwemling 10 Timothée Theveneaux-Pelzer 10 S. Trincaz-Duvoid 10 T.N. Trinh 10 F. Vannucci 11
Abstract : An inclusive search is presented for new physics in events with two isolated leptons (electron or muon) having the same electric charge. The data are selected from events collected from pp collisions at sqrt(s) = 7 TeV by the ATLAS detector and correspond to an integrated luminosity of 34 inverse picobarns. The spectra in dilepton invariant mass, missing transverse momentum and jet multiplicity are presented and compared to Standard Model predictions. In this event sample, no evidence is found for contributions beyond those of the Standard Model. Limits are set on the cross-section in a fiducial region for new sources of same-sign high-mass dilepton events in the di-electron, di-muon and electron-muon channels. Four models predicting same-sign dilepton signals are constrained: two descriptions of Majorana neutrinos, a cascade topology similar to supersymmetry or universal extra dimensions, and fourth generation down-type quarks. Assuming a new physics scale of 1 TeV, Majorana neutrinos produced by an effective operator V with masses below 460 GeV are excluded at 95% confidence level. A lower limit of 290 GeV is set at 95% confidence level on the mass of fourth generation down type quarks.
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Submitted on : Tuesday, August 2, 2011 - 9:41:47 AM
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G. Aad, S. Albrand, M.L. Andrieux, B. Clement, J. Collot, et al.. Inclusive search for same-sign dilepton signatures in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector. Journal of High Energy Physics, Springer, 2011, 10, pp.107. ⟨10.1007/JHEP10(2011)107⟩. ⟨in2p3-00613012⟩

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