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Search for contact interactions and large extra dimensions in the dilepton channel using proton-proton collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector

G. Aad 1 A. Bassalat 2 C. Becot 2 S. Binet 2 C. Bourdarios 2 D. Charfeddine 2 J.B. de Vivie de Regie 2 L. Duflot 2 M. Escalier 2 L. Fayard 2 D. Fournier 2 J.-F. Grivaz 2 T. Guillemin 2 S. Henrot-Versillé 2 J. Hrivnac 2 L. Iconomidou-Fayard 2 J. Idarraga 2 M. Kado 2 A. Lounis 2 N. Makovec 2 P. Matricon 2 L. Poggioli 2 P. Puzo 2 A. Renaud 2 D. Rousseau 2 G. Rybkin 2 A.C. Schaffer 2 E. Scifo 2 L. Serin 2 S. Simion 2 R. Tanaka 2 H.L. Tran 2 D. Zerwas 2 Zhiqing Zhang 2 G. Rahal 3 D. Boumediene 4 Emmanuel Busato 4 D. Calvet 4 S. Calvet 4 J. Donini 4 E. Dubreuil 4 N. Ghodbane 4 G. Gilles 4 Ph. Gris 4 C. Guicheney 4 H. Liao 4 D. Pallin 4 Daniela Paredes Hernández 4 F. Podlyski 4 C. Santoni 4 Timothée Theveneaux-Pelzer 4 Loïc Valery 4 F. Vazeille 4 S. Albrand 5 J. Brown 5 J. Collot 5 S. Crépé-Renaudin 5 B. Dechenaux 5 P.A. Delsart 5 C. Gabaldon 5 M.H. Genest 5 J.Y. Hostachy 5 F. Ledroit-Guillon 5 A. Lleres 5 A. Lucotte 5 F. Malek 5 C. Monini 5 J. Stark 5 B. Trocmé 5 M. Wu 5 Z. Barnovska 6 N. Berger 6 M. Delmastro 6 L. Di Ciaccio 6 T.K.O. Doan 6 S. Elles 6 C. Goy 6 T. Hryn'Ova 6 S. Jézéquel 6 H. Keoshkerian 6 I. Koletsou 6 R. Lafaye 6 J. Leveque 6 V.P. Lombardo 6 N. Massol 6 H. Przysiezniak 6 G. Sauvage 6 E. Sauvan 6 M. Schwoerer 6 O. Simard 6 T. Todorov 6 I. Wingerter-Seez 6 L. Alio 1 M. Barbero 1 C. Bertella 1 J. C. Clémens 1 Y. Coadou 1 S. Diglio 1 F. Djama 1 L. Feligioni 1 D. Hoffmann 1 F. Hubaut 1 E. B. F. G. Knoops 1 E. Le Guirriec 1 B. Li 1 D. Madaffari 1 K. Mochizuki 1 E. Monnier 1 S. Muanza 1 Y. Nagai 1 P. Pralavorio 1 A. Rozanov 1 T. Serre 1 M. Talby 1 N. Tannoury 1 E. Tiouchichine 1 S. Tisserant 1 J. Toth 1 F. Touchard 1 M. Ughetto 1, 7 L. Vacavant 1
Abstract : A search is conducted for non-resonant new phenomena in dielectron and dimuon final states, originating from either contact interactions or large extra spatial dimensions. The LHC 2012 proton-proton collision dataset recorded by the ATLAS detector is used, corresponding to 20 fb$^{-1}$ at $\sqrt{s}$ = 8 TeV. The dilepton invariant mass spectrum is a discriminating variable in both searches, with the contact interaction search additionally utilizing the dilepton forward-backward asymmetry. No significant deviations from the Standard Model expectation are observed. Lower limits are set on the new physics parameters of interest at the 95% credibility level. For $\ell\ell q q$ contact interactions, lower limits are set on the contact interaction scale $\Lambda$ between 15.4 TeV and 26.3 TeV. Lower limits are also set on the string scale $M_{S}$ for large extra spatial dimensions, from 4.1 TeV to 6.1 TeV.
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Submitted on : Thursday, July 10, 2014 - 3:42:28 PM
Last modification on : Wednesday, September 16, 2020 - 4:26:59 PM

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G. Aad, A. Bassalat, C. Becot, S. Binet, C. Bourdarios, et al.. Search for contact interactions and large extra dimensions in the dilepton channel using proton-proton collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2014, 74 (12), pp.3134. ⟨10.1140/epjc/s10052-014-3134-6⟩. ⟨in2p3-01022633⟩

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