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 (5) , 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 (6) , B. Aubert (6) , N. Berger (6) , J. Colas (6) , M. Delmastro (6) , L. Di Ciaccio (6) , T.K.O. Doan (6) , S. Elles (6) , C. Goy (6) , L. Helary (6) , T. Hryn'Ova (6) , A. Jérémie (6) , S. Jézéquel (6) , M. Kataoka (6) , J. Labbe (6) , R. Lafaye (6) , J. Leveque (6) , V.P. Lombardo (6) , N. Massol (6) , P. Perrodo (6) , E. Petit (6) , H. Przysiezniak (6) , E. Richter-Was (6) , G. Sauvage (6) , E. Sauvan (6) , M. Schwoerer (6) , T. Todorov (6) , D. Tsionou (6) , I. Wingerter-Seez (6) , R. Zitoun (6) , Y. Zolnierowski (6) , H. Abreu (7) , N. Andari (7) , C. Arnault (7) , E. Augé (7) , P. Barrillon (7) , M. Benoit , 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) , Sara 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) , 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) , J.J. Veillet (7) , I. Vukotic (7) , F. Wicek (7) , D. Zerwas (7) , Zhiqing Zhang (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 CC-IN2P3 - Centre de Calcul de l'IN2P3
2 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
3 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
4 APC - Neutrinos
5 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
6 LAPP - Laboratoire d'Annecy de Physique des Particules
7 LAL - Laboratoire de l'Accélérateur Linéaire
8 CPPM - Centre de Physique des Particules de Marseille

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.

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

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, 2012, 710, pp.538-556. ⟨10.1016/j.physletb.2012.03.022⟩. ⟨in2p3-00650710⟩