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Search for a multi-Higgs-boson cascade in WWbb events with the ATLAS detector in pp collisions at sqrt(s) = 8 TeV

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 C. Gabaldon 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 A. Bassalat 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 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 H.L. Tran 3 D. Zerwas 3 Zhiqing Zhang 3 D. Boumediene 4 Emmanuel Busato 4 D. Calvet 4 S. Calvet 4 J. Donini 4 E. Dubreuil 4 N. Ghodbane 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 L. Alio 5 M. Barbero 5 C. P. Bee 5 C. Bertella 5 N. Bousson 5 J. C. Clémens 5 Y. Coadou 5 F. Djama 5 F. Etienne 5 L. Feligioni 5 D. Hoffmann 5 F. Hubaut 5 E. B. F. G. Knoops 5 E. Le Guirriec 5 B. Li 5 J. Maurer 5 E. Monnier 5 Y. Nagai 5 J. Odier 5 P. Pralavorio 5 A. Rozanov 5 T. Serre 5 M. Talby 5 N. Tannoury 5 E. Tiouchichine 5 S. Tisserant 5 J. Toth 5 F. Touchard 5 M. Ughetto 5 L. Vacavant 5 N. Berger 6 J. Colas 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 R. Lafaye 6 J. Leveque 6 V.P. Lombardo 6 N. Massol 6 P. Perrodo 6 E. Petit 6 H. Przysiezniak 6 G. Sauvage 6 E. Sauvan 6 M. Schwoerer 6 T. Todorov 6 I. Wingerter-Seez 6 R. Zitoun 6 I. Koletsou 6 O. Simard 6
Abstract : A search is presented for new particles in an extension to the Standard Model that includes a heavy Higgs boson H0, an intermediate charged Higgs boson pair H+-, and a light Higgs boson h0. The analysis searches for events involving the production of a single heavy neutral Higgs boson which decays to the charged Higgs boson and a W boson, where the charged Higgs boson subsequently decays into a W boson and the lightest neutral Higgs boson decaying to a bottom--antibottom-quark pair. Such a cascade results in a W-boson pair and a bottom--antibottom-quark pair in the final state. Events with exactly one lepton, missing transverse momentum, and at least four jets are selected from a data sample corresponding to an integrated luminosity of 20.3/fb, collected by the ATLAS detector in proton--proton collisions at sort(s)=8 TeV at the LHC. The data are found to be consistent with Standard Model predictions, and 95% confidence-level upper limits are set on the product of cross section and branching ratio. These limits range from 0.065 pb to 43 pb as a function of H0 and H+- masses, with m(h0) fixed at 125 GeV.
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Submitted on : Monday, December 9, 2013 - 8:18:37 AM
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G. Aad, S. Albrand, J. Brown, Q. Buat, B. Clement, et al.. Search for a multi-Higgs-boson cascade in WWbb events with the ATLAS detector in pp collisions at sqrt(s) = 8 TeV. Physical Review D, American Physical Society, 2014, 89, pp.032002. ⟨10.1103/PhysRevD.89.032002⟩. ⟨in2p3-00915578⟩

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