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Search for Extra Dimensions using diphoton events in 7 TeV proton-proton collisions with the ATLAS detector

G. Aad C. Biscarat 1 E. Cogneras 1 G. Rahal 1 S. Albrand 2 M.L. Andrieux 2 Q. Buat 2 B. Clement 2 J. Collot 2 S. Crépé-Renaudin 2 T. Delemontex 2 P.A. Delsart 2 M.H. Genest 2 J.Y. Hostachy 2 E. Laisne 2 F. Ledroit-Guillon 2 A. Lleres 2 A. Lucotte 2 F. Malek 2 P. Martin F. Polci 2 J. Stark 2 X. Sun 2 B. Trocmé 2 J. Wang 2 C. Weydert 2 T. Beau 3 S. Bordoni 3 G. Calderini 3 A. Camard 3 P. Cavalleri 3 E. Chareyre 3 S. de Cecco 3 F. Derue 3 D. Imbault 3 M.W. Krasny 3 D. Lacour 3 B. Laforge 3 O. Le Dortz 3 J. Lellouch 3 G. Marchiori 3 I. Nikolic-Audit 3 J. Ocariz 3 M. Ridel 3 L. Roos 3 Ph. Schwemling 3 Timothée Theveneaux-Pelzer 3 S. Trincaz-Duvoid 3 T.N. Trinh 3 F. Vannucci 4 D. Boumediene 5 Emmanuel Busato 5 D. Calvet 5 S. Calvet 5 Reina Coromoto Camacho Toro 5 Diane Cinca 6 J. Donini 5 R. Febbraro 5 N. Ghodbane 5 C. Guicheney 5 H. Liao 5 D. Pallin 5 F. Podlyski 5 C. Santoni 5 L. P. Says 5 F. Vazeille 5 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 H. Abreu 8 N. Andari 8 C. Arnault 8 E. Augé 8 P. Barrillon 8 M. Benoit S. Binet 8 J.-B. Blanchard 8 C. Bourdarios 8 D. Breton 8 C. Collard 8 C. de la Taille 8 J.B. de Vivie de Regie 8 S. 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 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 S. Aoun 9 C. P. Bee 9 C. Benchouk 9 C. Bertella 9 N. Bousson 9 J. C. Clémens 9 Y. Coadou 9 F. Djama 9 F. Etienne 9 L. Feligioni 9 F. Henry-Couannier 9 D. Hoffmann 9 F. Hubaut 9 E. B. F. G. Knoops 9 E. Le Guirriec 9 B. Li 9 J. Maurer 9 E. Monnier 9 J. Odier 9 P. Pralavorio 9 Z. Qian 9 A. Rozanov 9 M. Talby 9 N. Tannoury 9 S. Tisserant 9 J. Toth 9 F. Touchard 9 L. Vacavant 9
Abstract : Using data recorded in 2011 with the ATLAS detector at the Large Hadron Collider, a search for evidence of extra spatial dimensions has been performed through an analysis of the diphoton final state. The analysis uses data corresponding to an integrated luminosity of 2.12 fb^-1 of sqrt(s) = 7 TeV proton-proton collisions. The diphoton invariant mass spectrum is observed to be in good agreement with the expected Standard Model background. In the large extra dimension scenario of Arkani-Hamed, Dimopoulos and Dvali, the results provide 95% CL lower limits on the fundamental Planck scale between 2.27 and 3.53 TeV, depending on the number of extra dimensions and the theoretical formalism used. The results also set 95% CL lower limits on the lightest Randall-Sundrum graviton mass of between 0.79 and 1.85 TeV, for values of the dimensionless coupling k/\bar{M}_{Pl} varying from 0.01 to 0.1. Combining with previously published ATLAS results from the dielectron and dimuon final states, the 95% CL lower limit on the Randall-Sundrum graviton mass for k/\bar{M}_{Pl} = 0.01 (0.1) is 0.80 (1.95) TeV.
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Submitted on : Monday, December 12, 2011 - 10:17:25 AM
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G. Aad, C. Biscarat, E. Cogneras, G. Rahal, S. Albrand, et al.. Search for Extra Dimensions using diphoton events in 7 TeV proton-proton collisions with the ATLAS detector. Physics Letters B, Elsevier, 2012, 710, pp.538-556. ⟨10.1016/j.physletb.2012.03.022⟩. ⟨in2p3-00650710⟩

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