Search for extra dimensions in diphoton events from proton-proton collisions at $\sqrt {s} = 7$ TeV in the ATLAS detector at the LHC

G. Aad S. Albrand 1 M.L. Andrieux 1 Q. Buat 1 B. Clement 1 J. Collot 1 S. Crépé-Renaudin 1 B. Dechenaux 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 J. Stark 1 X. Sun 1 B. Trocmé 1 J. Wang C. Weydert 1 C. Biscarat 2 E. Cogneras 2 G. Rahal 2 L. Aperio Bella 3 B. Aubert 3 N. Berger 3 J. Colas 3 M. Delmastro 3 L. Di Ciaccio 3 T.K.O. Doan 3 S. Elles 3 C. Goy 3 T. Hryn'Ova 3 S. Jézéquel 3 M. Kataoka 3 J. Labbe 3 R. Lafaye 3 J. Leveque 3 V.P. Lombardo 3 N. Massol 3 P. Perrodo 3 E. Petit 3 H. Przysiezniak 3 E. Richter-Was 3 G. Sauvage 3 E. Sauvan 3 M. Schwoerer 3 T. Todorov 3 D. Tsionou 3 I. Wingerter-Seez 3 R. Zitoun 3 S. Abdel Khalek 4 H. Abreu 4 N. Andari 4 C. Arnault 4 E. Augé 4 P. Barrillon 4 M. Benoit 4 S. Binet 4 C. Bourdarios 4 C. De La Taille 4 J.B. De Vivie De Regie 4 L. Duflot 4 M. Escalier 4 L. Fayard 4 D. Fournier 4 J.-F. Grivaz 4 S. Henrot-Versillé 4 J. Hrivnac 4 L. Iconomidou-Fayard 4 J. Idarraga 4 M. Kado 4 N. Lorenzo Martinez 4 A. Lounis 4 N. Makovec 4 P. Matricon 4 F. Niedercorn 4 L. Poggioli 4 P. Puzo 4 A. Renaud 4 D. Rousseau 4 G. Rybkin 4 J.B. Sauvan 4 J. Schaarschmidt 4 A.C. Schaffer 4 L. Serin 4 S. Simion 4 R. Tanaka 4 M. Teinturier 4 J.J. Veillet 4 I. Vukotic 4 F. Wicek 4 D. Zerwas 4 Z. Zhang 4 D. Boumediene 5 E. Busato 5 D. Calvet 5 S. Calvet 5 R. Camacho Toro 5 Diane Cinca 6 J. Donini 5 R. Febbraro 5 Ph. Gris 5 N. Ghodbane 5 C. Guicheney 5 H. Liao 5 D. Pallin 5 D. Paredes Hernandez 5 F. Podlyski 5 C. Santoni 5 F. Vazeille 5 F. Vannucci 7 S. Aoun 8 C. P. Bee 8 C. Bertella 8 N. Bousson 8 J. C. Clémens 8 Y. Coadou 8 F. Djama 8 F. Etienne 8 L. Feligioni 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 A. Rozanov 8 M. Talby 8 N. Tannoury 8 S. Tisserant 8 J. Toth 8 F. Touchard 8 L. Vacavant 8
Abstract : The large difference between the Planck scale and the electroweak scale, known as the hierarchy problem, is addressed in certain models through the postulate of extra spatial dimensions. A search for evidence of extra spatial dimensions in the diphoton channel has been performed using the full set of proton-proton collisions at sqrt(s) = 7 TeV recorded in 2011 with the ATLAS detector at the CERN Large Hadron Collider. This dataset corresponds to an integrated luminosity of 4.9 /fb. The diphoton invariant mass spectrum is observed to be in good agreement with the expected Standard Model background. 95% confidence level lower limits of between 2.52 TeV and 3.92 TeV are set on the Ms scale in the context of the model proposed by Arkani-Hamed, Dimopoulos and Dvali, depending on the number of extra dimensions and the theoretical formalism used. In the context of the Randall--Sundrum model, a lower limit of 1.00 (2.06) TeV at 95% confidence level is set on the mass of the lightest graviton for couplings of k/Mpl = 0.01 (0.1). Combining with the ATLAS dilepton searches based on the 2011 data, the 95% confidence level limit on the Randall--Sundrum graviton mass is further tightened to 1.03 (2.23) TeV for k/Mpl = 0.01 (0.1).
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Submitted on : Monday, November 5, 2012 - 9:00:45 AM
Last modification on : Monday, November 5, 2012 - 9:00:45 AM

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G. Aad, S. Albrand, M.L. Andrieux, Q. Buat, B. Clement, et al.. Search for extra dimensions in diphoton events from proton-proton collisions at $\sqrt {s} = 7$ TeV in the ATLAS detector at the LHC. New Journal of Physics, Institute of Physics: Open Access Journals, 2013, 15, pp.043007. <10.1088/1367-2630/15/4/043007>. <in2p3-00748189>

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