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Search for an excess of events with an identical flavour lepton pair and significant missing transverse momentum in sqrt{s} = 7 TeV proton-proton collisions 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 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 C. Biscarat 2 E. Cogneras 2 G. Rahal 2 H. Bachacou 3 F. Bauer 3 N. Besson 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 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 J. Yu 3 Emmanuel Busato 4 D. Calvet 4 S. Calvet 4 Reina Coromoto Camacho Toro 4 Diane Cinca 5 R. Febbraro 4 P.L.Y. Gris 4 N. Ghodbane 4 C. Guicheney 4 D. Pallin 4 F. Podlyski 4 C. Santoni 4 L. P. Says 4 F. Vazeille 4 S. Viret 4 L. Aperio Bella 6 B. Aubert 6 N. Berger 6 J. Colas 6 L. Di Ciaccio 6 T.K.O. Doan 6 M. El Kacimi 6 S. Elles 6 P. Ghez 6 M. Gouanère 6 C. Goy 6 T. Guillemin 6 L. Helary 6 T. Hryn'Ova 6 G. Ionescu 6 A. Jérémie 6 S. Jézéquel 6 M. Kataoka 6 J. Labbe 6 R. Lafaye 6 Jérémy Lévêque 6 N. Massol 6 P. Perrodo 6 H. Przysiezniak 6 G. Sauvage 6 T. Todorov 6 D. Tsionou 6 I. Wingerter-Seez 6 R. Zitoun 6 Y. Zolnierowski 6 H. Abreu 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 7 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 Y. Nakahama 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 D. Varouchas 7 J.J. Veillet 7 I. Vukotic 7 F. Wicek 7 D. Zerwas 7 Zhiqing Zhang 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. Boussons 10 J. C. Clèmens 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
Abstract : Results are presented of a search for supersymmetric particles decaying into final states with significant missing transverse momentum and exactly two identical flavour leptons (e or mu) of opposite charge in sqrt{s}=7 TeV collisions at the Large Hadron Collider. This channel is particularly sensitive to supersymmetric particle cascade decays producing flavour correlated lepton pairs. Flavour uncorrelated backgrounds are subtracted using a sample of opposite flavour lepton pair events. Observation of an excess beyond Standard Model expectations following this subtraction procedure would offer one of the best routes to measuring the masses of supersymmetric particles. In a data sample corresponding to an integrated luminosity of 35 pb-1 no such excess is observed. Model-independent limits are set on the contribution to these final states from new physics and are used to exclude regions of a phenomenological supersymmetric parameter space.
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Submitted on : Monday, April 4, 2011 - 9:28:18 AM
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G. Aad, S. Albrand, M.L. Andrieux, B. Clement, J. Collot, et al.. Search for an excess of events with an identical flavour lepton pair and significant missing transverse momentum in sqrt{s} = 7 TeV proton-proton collisions with the ATLAS detector. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2011, 71, pp.1647. ⟨10.1140/epjc/s10052-011-1647-9⟩. ⟨in2p3-00582741⟩

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