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Search for excited electrons and muons in sqrt(s)=8 TeV proton-proton collisions with the ATLAS detector

G. Aad S. Albrand 1 J. Brown 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 B.T. Le 1 F. Ledroit-Guillon 1 A. Lleres 1 A. Lucotte 1 F. Malek 1 C. Monini 1 J. Stark 1 X. Sun 1 B. Trocmé 1 G. Rahal 2 S. Abdel Khalek 3 E. Augé 3 S. Binet 3 C. Bourdarios 3 C. de la Taille 3 J.B. de Vivie de Regie 3 L. Duflot 3 M. Escalier 3 L. Fayard 3 D. Fournier 3 J.-F. Grivaz 3 T. Guillemin 3 S. Henrot-Versillé 3 J. Hrivnac 3 L. Iconomidou-Fayard 3 J. Idarraga 3 M. Kado 3 N. Lorenzo Martinez 3 A. Lounis 3 N. Makovec 3 F. Niedercorn 3 L. Poggioli 3 P. Puzo 3 A. Renaud 3 D. Rousseau 3 G. Rybkin 3 J.B. Sauvan 3 J. Schaarschmidt 3 A.C. Schaffer 3 E. Scifo 3 L. Serin 3 S. Simion 3 R. Tanaka 3 M. Teinturier 3 H.L. Tran 3 D. Zerwas 3 Zhiqing Zhang 3 L. Alio 4 M. Barbero 4 C. P. Bee 4 C. Bertella 4 N. Bousson 4 J. C. Clémens 4 Y. Coadou 4 F. Djama 4 F. Etienne 4 L. Feligioni 4 D. Hoffmann 4 F. Hubaut 4 E. B. F. G. Knoops 4 E. Le Guirriec 4 B. Li 4 J. Maurer 4 E. Monnier 4 Y. Nagai 4 J. Odier 4 P. Pralavorio 4 A. Rozanov 4 T. Serre 4 M. Talby 4 N. Tannoury 4 E. Tiouchichine 4 S. Tisserant 4 J. Toth 4 F. Touchard 4 M. Ughetto 4 L. Vacavant 4 N. Berger 5 J. Colas 5 M. Delmastro 5 L. Di Ciaccio 5 T.K.O. Doan 5 S. Elles 5 C. Goy 5 T. Hryn'Ova 5 S. Jézéquel 5 H. Keoshkerian 5 R. Lafaye 5 J. Leveque 5 V.P. Lombardo 5 M. Maeno 5 N. Massol 5 P. Perrodo 5 E. Petit 5 H. Przysiezniak 5 G. Sauvage 5 E. Sauvan 5 M. Schwoerer 5 T. Todorov 5 I. Wingerter-Seez 5 R. Zitoun 5 D. Boumediene 6 Emmanuel Busato 6 D. Calvet 6 S. Calvet 6 J. Donini 6 E. Dubreuil 6 N. Ghodbane 6 Ph. Gris 6 C. Guicheney 6 H. Liao 6 D. Pallin 6 Daniela Paredes Hernández 6 F. Podlyski 6 C. Santoni 6 Timothée Theveneaux-Pelzer 6 Loïc Valery 6 F. Vazeille 6
Abstract : The ATLAS detector at the LHC is used to search for excited electrons and excited muons in the channel pp -> ll* -> llgamma, assuming that excited leptons are produced via contact interactions. The analysis is based on 13 fb-1 of pp collisions at a centre-of-mass energy of 8 TeV. No evidence for excited leptons is found, and a limit is set at the 95% credibility level on the cross section times branching ratio as a function of the excited-lepton mass m_l*. For m_l* > 0.8 TeV, the respective upper limits on sigma*B(l* -> lgamma) are 0.75 fb and 0.90 fb for the e* and mu* searches. Limits on sigma*B are converted into lower bounds on the compositeness scale Lambda. In the special case where Lambda = m_l*, excited-electron and excited-muon masses below 2.2 TeV are excluded.
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Submitted on : Wednesday, August 7, 2013 - 8:27:42 AM
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G. Aad, S. Albrand, J. Brown, Q. Buat, B. Clement, et al.. Search for excited electrons and muons in sqrt(s)=8 TeV proton-proton collisions with the ATLAS detector. New Journal of Physics, Institute of Physics: Open Access Journals, 2013, 15, pp.093011. ⟨10.1088/1367-2630/15/9/093011⟩. ⟨in2p3-00850508⟩

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