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Search for charged Higgs bosons through the violation of lepton universality in ttbar events using pp collision data at sqrt(s) = 7 TeV with the ATLAS experiment

G. Aad S. Albrand 1 M.L. Andrieux 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 F. Ledroit-Guillon 1 A. Lleres 1 A. Lucotte 1 F. Malek 1 J. Stark 1 X. Sun 1 B. Trocmé 1 C. Weydert 1 C. Biscarat 2 G. Rahal 2 S. Abdel Khalek 3 N. Andari 3 E. Augé 3 M. Benoit 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 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 L. Serin 3 S. Simion 3 R. Tanaka 3 M. Teinturier 3 J.J. Veillet 3 D. Zerwas 3 Zhen Zhang 3 D. Boumediene 4 Emmanuel Busato 4 D. Calvet 4 S. Calvet 4 Reina Coromoto Camacho Toro 4 Diane Cinca 5 J. Donini 4 Ph. Gris 4 N. Ghodbane 4 C. Guicheney 4 H. Liao 4 D. Pallin 4 Daniela Paredes Hernández 4 F. Podlyski 4 C. Santoni 4 F. Vazeille 4 F. Vannucci 6 L. Aperio Bella 7 B. Aubert 7 N. Berger 7 J. Colas 7 M. Delmastro 7 L. Di Ciaccio 7 T.K.O. Doan 7 S. Elles 7 C. Goy 7 T. Hryn'Ova 7 S. Jézéquel 7 R. Lafaye 7 J. Leveque 7 V.P. Lombardo 7 N. Massol 7 P. Perrodo 7 E. Petit 7 H. Przysiezniak 7 E. Richter-Was 7 G. Sauvage 7 E. Sauvan 7 M. Schwoerer 7 T. Todorov 7 D. Tsionou 7 I. Wingerter-Seez 7 R. Zitoun 7 Cp. Bee 8 C. Bertella 8 N. Bousson 8 J. C. Clémens 8 Y. Coadou 8 F. Djama 8 F. Etienne 8 L. Feligioni 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 A. Rozanov 8 T. Serre 8 M. Talby 8 N. Tannoury 8 E. Tiouchichine 8 S. Tisserant 8 J. Toth 8 F. Touchard 8 M. Ughetto 8 L. Vacavant 8 S. Aoun 8
Abstract : In several extensions of the Standard Model, the top quark can decay into a bottom quark and a light charged Higgs boson H+, t to bH+, in addition to the Standard Model decay t to bW. Since W bosons decay to the three lepton generations equally, while H+ may predominantly decay into tau+nu, charged Higgs bosons can be searched for using the violation of lepton universality in top quark decays. The analysis in this paper is based on 4.6/fb of proton-proton collision data at sqrt(s) = 7 TeV collected by the ATLAS experiment at the Large Hadron Collider. Signatures containing leptons (e or mu) and/or a hadronically decaying tau (tau_had) are used. Event yield ratios between e+tau_had and e+mu, as well as between mu+tau_had and mu+e, final states are measured in the data and compared to predictions from simulations. This ratio-based method reduces the impact of systematic uncertainties in the analysis. No significant deviation from the Standard Model predictions is observed. With the assumption that the branching fraction B(H+ to tau+nu) is 100%, upper limits in the range 3.2%-4.4% can be placed on the branching fraction B(t to bH+) for charged Higgs boson masses m(H+) in the range 90-140 GeV. After combination with results from a search for charged Higgs bosons in ttbar decays using the tau_had+jets final state, upper limits on B(t to bH+) can be set in the range 0.8%-3.4%, for m(H+) in the range 90-160 GeV.
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Submitted on : Monday, December 17, 2012 - 9:50:24 AM
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G. Aad, S. Albrand, M.L. Andrieux, Q. Buat, B. Clement, et al.. Search for charged Higgs bosons through the violation of lepton universality in ttbar events using pp collision data at sqrt(s) = 7 TeV with the ATLAS experiment. Journal of High Energy Physics, Springer, 2013, 3, pp.076. ⟨10.1007/JHEP03(2013)076⟩. ⟨in2p3-00765868⟩

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