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Search for pair production of first or second generation leptoquarks in proton-proton collisions at sqrt(s)=7 TeV using the ATLAS detector at the LHC

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 D. 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 H. Bachacou 2 F. Bauer 2 N. Besson 2 N.M. Bolnet 2 M. Boonekamp 2 L. Chevalier 2 J. Ernwein 2 A.I. Etienvre 2 A. Formica 2 L. Gauthier 2 F. Giraud 2 C. Guyot 2 S. Hassani 2 W. Kozanecki 2 E. Lancon 2 J.F. Laporte 2 E. Le Menedeu 2 M. Legendre 2 B. Lenzi 2 B. Mansoulie 2 J.-P. Meyer 2 N. Morange 2 R. Nicolaidou 2 A. Ouraou 2 D.M. Pomarede 2 B. Resende 2 C.R. Royon 2 Ph. Schune 2 J. Schwindling 2 O. Simard 2 M. Virchaux 2 J. Yu 2 C. Biscarat 3 E. Cogneras 3 G. Rahal 3 C. Bee 4 C. Benchouk 4 K. Bernardet 4 N. Boussons 4 J. C. Clèmens 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 S. Aoun 4 Emmanuel Busato 5 D. Calvet 5 S. Calvet 5 Reina Coromoto Camacho Toro 5 Diane Cinca 6 P.-O. Defay 5 R. Febbraro 5 N. Ghodbane 5 P. Gris 5 C. Guicheney 5 D. Pallin 5 F. Podlyski 5 C. Santoni 5 L. P. Says 5 F. Vazeille 5 S. Viret 5 T. Beau 7 S. Bordoni 7 G. Calderini 7 A. Camard 7 P. Cavalleri 7 E. Chareyre 7 S. de Cecco 7 F. Derue 7 D. Imbault 7 M.W. Krasny 7 D. Lacour 7 B. Laforge 7 O. Le Dortz 7 J. Lellouch 7 G. Marchiori 7 I. Nikolic-Audit 7 J. Ocariz 7 M. Ridel 7 L. Roos 7 Ph. Schwemling 7 Timothée Theveneaux-Pelzer 7 S. Trincaz-Duvoid 7 T.N. Trinh 7 F. Vannucci 8 L. Aperio-Bella 9 B. Aubert 9 N. Berger 9 J. Colas 9 L. Di Ciaccio 9 T.K.O. Doan 9 M. El Kacimi 9 S. Elles 9 P. Ghez 9 M. Gouanère 9 C. Goy 9 T. Guillemin 9 L. Helary 9 T. Hryn'Ova 9 P. Iengo 9 G. Ionescu 9 A. Jérémie 9 S. Jézéquel 9 M. Kataoka 9 J. Labbe 9 R. Lafaye 9 Jérémy Lévêque 9 N. Massol 9 P. Perrodo 9 H. Przysiezniak 9 G. Sauvage 9 T. Todorov 9 D. Tsionou 9 I. Wingerter-Seez 9 R. Zitoun 9 Y. Zolnierowski 9 H. Abreu 10 C. Arnault 10 E. Augé 10 P. Barrillon 10 M. Benoit 10 S. Binet 10 J.-B. Blanchard 10 C. Bourdarios 10 D. Breton 10 C. Collard C. de la Taille 10 J.B. de Vivie de Regie 10 S. Diglio 10 F. Dudziak 10 L. Duflot 10 M. Escalier 10 A.C. Falou 10 L. Fayard 10 D. Fournier 10 J.-F. Grivaz 10 M. Heller 10 S. Henrot-Versillé 10 J. Hrivnac 10 L. Iconomidou-Fayard 10 J. Idarraga 10 M. Kado 10 A. Lounis 10 N. Makovec 10 P. Matricon 10 Y. Nakahama 10 F. Niedercorn 10 L. Poggioli 10 P. Puzo 10 A. Renaud 10 D. Rousseau 10 X. Ruan 10 G. Rybkin 10 J.B. Sauvan 10 J. Schaarschmidt 10 A.C. Schaffer 10 L. Serin 10 S. Simion 10 R. Tanaka 10 D. Varouchas 10 J.J. Veillet 10 I. Vukotic 10 F. Wicek 10 D. Zerwas 10 Zhiqing Zhang 10 M. Kuna 7 Sandrine Laplace 7, 9
Abstract : This paper describes searches for the pair production of first or second generation scalar leptoquarks using 35/pb of proton-proton collision data recorded by the ATLAS detector at sqrt(s)=7 TeV. Leptoquarks are seached in events with two oppositely charged muons or electrons and at least two jets, and in events with one muon or electron, missing transverse momentum and at least two jets. After event selection, the observed yields are consistent with the predicted backgrounds. Leptoquark production is excluded at the 95% CL for masses mLQ<376 (319) GeV and mLQ<422 (362) GeV for first and second generation scalar leptoquarks, respectively, when assuming the branching fraction of a leptoquark to a charged lepton is equal to 1.0 (0.5).
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Submitted on : Wednesday, May 4, 2011 - 9:00:20 AM
Last modification on : Tuesday, December 1, 2020 - 2:32:13 PM

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G. Aad, S. Albrand, M.L. Andrieux, B. Clement, J. Collot, et al.. Search for pair production of first or second generation leptoquarks in proton-proton collisions at sqrt(s)=7 TeV using the ATLAS detector at the LHC. Physical Review D, American Physical Society, 2011, 83, pp.112006. ⟨10.1103/PhysRevD.83.112006⟩. ⟨in2p3-00590607⟩

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