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Search for long-lived neutral particles decaying into lepton jets in proton--proton collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector

G. Aad 1 L. Alio 1 M. Barbero 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 E. Tiouchichine 1 S. Tisserant 1 J. Toth 1 F. Touchard 1 M. Ughetto 1 L. Vacavant 1 D. Boumediene 2 Emmanuel Busato 2 D. Calvet 2 S. Calvet 2 J. Donini 2 E. Dubreuil 2 N. Ghodbane 2 G. Gilles 2 Ph. Gris 2 C. Guicheney 2 H. Liao 2 D. Pallin 2 F. Podlyski 2 C. Santoni 2 Timothée Theveneaux-Pelzer 2 Loïc Valery 2 F. Vazeille 2 H. Bachacou 3 F. Balli 3 F. Bauer 3 N. Besson 3 J.-B. Blanchard 3 M. Boonekamp 3 A. Calandri 3 L. Chevalier 3 M. Dano Hoffmann 3 F. Deliot 3 J. Ernwein 3 A.I. Etienvre 3 A. Formica 3 P.F. Giraud 3 C. Guyot R. Hanna 3 S. Hassani 3 W. Kozanecki 3 E. Lancon 3 J.F. Laporte 3 C. Maiani 3 P. Mal 3 B. Mansoulie 3 H. Martinez 2 N. Meric 3 J.-P. Meyer 3 R. Nicolaidou 3 A. Ouraou 3 E. Protopapadaki 3 C.R. Royon 3 L. L. Schoffel 3 Ph. Schune 3 Ph. Schwemling 3 J. Schwindling 3 D. Tsionou 3 N. Vranjes 3 M. Xiao 3 T. Beau 4 M. Bomben 4 G. Calderini 4 F. Crescioli 4 O. Davignon 4 S. de Cecco 4 A. Demilly 4 F. Derue 4 P. Francavilla 4 M.W. Krasny 4 D. Lacour 4 B. Laforge 4 S. Laplace 4 O. Le Dortz 4 G. Lefebvre 4 B. Malaescu 4 G. Marchiori 4 I. Nikolic-Audit 4 J. Ocariz 4 S. Pires 4 M. Ridel 4 L. Roos 4 S. Trincaz-Duvoid 4 F. Vannucci 4 D. Varouchas 4 G. Rahal 5 Z. Barnovska 6 N. Berger 6 M. Delmastro 6 L. Di Ciaccio 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 S. Albrand 7 J. Brown 7 J. Collot 7 S. Crépé-Renaudin 7 B. Dechenaux 7 P.A. Delsart 7 C. Gabaldon 7 M.H. Genest 7 J.Y. Hostachy 7 F. Ledroit-Guillon 7 A. Lleres 7 A. Lucotte 7 F. Malek 7 C. Monini 7 J. Stark 7 B. Trocmé 7 M. Wu 7 S. Abdel Khalek 8 A. Bassalat 8 C. Becot 8 S. Binet 8 C. Bourdarios 8 D. Charfeddine 8 J.B. de Vivie de Regie 8 L. Duflot 8 M. Escalier 8 L. Fayard 8 D. Fournier 8 J.-F. Grivaz 8 T. Guillemin 8 F. Hariri 8 S. Henrot-Versillé 8 J. Hrivnac 8 L. Iconomidou-Fayard 8 M. Kado 8 A. Lounis 8 N. Makovec 8 L. Poggioli 8 P. Puzo 8 A. Renaud 8 D. Rousseau 8 G. Rybkin 8 A.C. Schaffer 8 E. Scifo 8 L. Serin 8 S. Simion 8 R. Tanaka 8 H.L. Tran 8 D. Zerwas 8 Zhiqing Zhang 8
Abstract : Several models of physics beyond the Standard Model predict neutral particles that decay into final states consisting of collimated jets of light leptons and hadrons (so-called "lepton jets"). These particles can also be long-lived with decay length comparable to, or even larger than, the LHC detectors' linear dimensions. This paper presents the results of a search for lepton jets in proton--proton collisions at the centre-of-mass energy of $\sqrt{s}$ = 8 TeV in a sample of 20.3 fb$^{-1}$ collected during 2012 with the ATLAS detector at the LHC. Limits on models predicting Higgs boson decays to neutral long-lived lepton jets are derived as a function of the particle's proper decay length.
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http://hal.in2p3.fr/in2p3-01060206
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Submitted on : Wednesday, September 3, 2014 - 10:36:51 AM
Last modification on : Saturday, November 28, 2020 - 12:58:04 PM

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G. Aad, L. Alio, M. Barbero, J. C. Clémens, Y. Coadou, et al.. Search for long-lived neutral particles decaying into lepton jets in proton--proton collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector. Journal of High Energy Physics, Springer, 2014, 2014 (11), pp.088. ⟨10.1007/JHEP11(2014)088⟩. ⟨in2p3-01060206⟩

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