Search for first generation scalar leptoquarks in pp collisions at sqrt{s}=7 TeV with the ATLAS detector

G. Aad , S. Albrand (1) , M.L. Andrieux (1) , Q. Buat (1) , B. Clement (1) , J. Collot (1) , S. Crépé-Renaudin (1) , T. Delemontex (1) , P.A. Delsart (1) , M.H. Genest (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) , J. Wang (1) , C. Weydert (1) , C. Biscarat (2) , E. Cogneras (2) , G. Rahal (2) , H. Abreu (3) , N. Andari (3) , C. Arnault (3) , E. Augé (3) , P. Barrillon (3) , M. Benoit , S. Binet (3) , J.-B. Blanchard (3) , C. Bourdarios (3) , D. Breton (3) , C. Collard (3) , C. de La Taille (3) , J.B. de Vivie de Regie (3) , Sara Diglio (3) , L. Duflot (3) , M. Escalier (3) , A.C. Falou (3) , L. Fayard (3) , D. Fournier (3) , J.-F. Grivaz (3) , M. Heller (3) , S. Henrot-Versillé (3) , J. Hrivnac (3) , L. Iconomidou-Fayard (3) , J. Idarraga (3) , M. Kado (3) , A. Lounis (3) , N. Makovec (3) , P. Matricon (3) , F. Niedercorn (3) , L. Poggioli (3) , P. Puzo (3) , A. Renaud (3) , D. Rousseau (3) , X. Ruan (3) , G. Rybkin (3) , J.B. Sauvan (3) , J. Schaarschmidt (3) , A.C. Schaffer (3) , L. Serin (3) , S. Simion (3) , R. Tanaka (3) , J.J. Veillet (3) , I. Vukotic (3) , F. Wicek (3) , D. Zerwas (3) , Zhiqing Zhang (3) , D. Boumediene (4) , Emmanuel Busato (4) , D. Calvet (4) , S. Calvet (4) , Reina Coromoto Camacho Toro (4) , Diane Cinca (4) , J. Donini (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) , T. Beau (5) , S. Bordoni (5) , G. Calderini (5) , A. Camard (5) , P. Cavalleri (5) , E. Chareyre (5) , S. de Cecco (5) , F. Derue (5) , D. Imbault (5) , M.W. Krasny (5) , D. Lacour (5) , B. Laforge (5) , O. Le Dortz (5) , J. Lellouch (5) , G. Marchiori (5) , I. Nikolic-Audit (5) , J. Ocariz (5) , M. Ridel (5) , L. Roos (5) , Ph. Schwemling (5) , Timothée Theveneaux-Pelzer (5) , S. Trincaz-Duvoid (5) , T.N. Trinh (5) , F. Vannucci (6) , L. Aperio Bella (7) , B. Aubert (7) , N. Berger (7) , J. Colas (7) , M. Delmastro (7) , L. Di Ciaccio (7) , T.K.O. Doan (7) , S. Elles (7) , C. Goy (7) , L. Helary (7) , T. Hryn'Ova (7) , A. Jérémie (7) , S. Jézéquel (7) , M. Kataoka (7) , J. Labbe (7) , R. Lafaye (7) , J. Leveque (7) , V.P. Lombardo (7) , N. Massol (7) , P. Perrodo (7) , E. Petit (7) , H. Przysiezniak (7) , E. Richter-Was (7) , G. Sauvage (7) , E. Sauvan (7) , M. Schwoerer (7) , T. Todorov (7) , D. Tsionou (7) , I. Wingerter-Seez (7) , R. Zitoun (7) , Y. Zolnierowski (7) , S. Aoun (8) , C. P. Bee (8) , C. Benchouk (8) , C. Bertella (8) , N. Bousson (8) , J. C. Clémens (8) , Y. Coadou (8) , F. Djama (8) , F. Etienne (8) , L. Feligioni (8) , F. Henry-Couannier (8) , D. Hoffmann (8) , F. Hubaut (8) , E. B. F. G. Knoops (8) , E. Le Guirriec (8) , B. Li (8) , J. Maurer (8) , E. Monnier (8) , J. Odier (8) , P. Pralavorio (8) , Z. Qian (8) , A. Rozanov (8) , M. Talby (8) , N. Tannoury (8) , S. Tisserant (8) , J. Toth (8) , F. Touchard (8) , L. Vacavant (8)

1 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
2 CC-IN2P3 - Centre de Calcul de l'IN2P3
3 LAL - Laboratoire de l'Accélérateur Linéaire
4 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
5 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
6 APC - Neutrinos
7 LAPP - Laboratoire d'Annecy de Physique des Particules
8 CPPM - Centre de Physique des Particules de Marseille

We report a search for first generation scalar leptoquarks using 1.03 fb^-1 of proton-proton collisions data produced by the Large Hadron Collider at sqrt{s}=7 TeV and recorded by the ATLAS experiment. Leptoquarks are sought via their decay into an electron or neutrino and a quark, producing events with two oppositely charged electrons and at least two jets, or events with an electron, missing transverse momentum and at least two jets. Control data samples are used to validate background predictions from Monte Carlo simulation. In the signal region, the observed event yields are consistent with the background expectations. We exclude at 95% confidence level the production of first generation scalar leptoquark with masses m_LQ< 660 (607)GeV when assuming the branching fraction of a leptoquark to a charged lepton is equal to 1.0 (0.5).

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

G. Aad, S. Albrand, M.L. Andrieux, Q. Buat, B. Clement, et al.. Search for first generation scalar leptoquarks in pp collisions at sqrt{s}=7 TeV with the ATLAS detector. Physics Letters B, 2012, 709, pp.158-176. ⟨10.1016/j.physletb.2012.02.004⟩. ⟨in2p3-00654171⟩