Search for the Standard Model Higgs boson decaying into bb¯ produced in association with top quarks decaying hadronically in pp collisions at s√=8 TeV with the ATLAS detector

G. Aad 1 S. Albrand 2 S. Berlendis 2 C. Camincher 2 J. Collot 2 S. Crépé-Renaudin 2 P.A. Delsart 2 C. Gabaldon 2 M.H. Genest 2 J. Gradin 2 J.Y. Hostachy 2 F. Ledroit-Guillon 2 A. Lleres 2 A. Lucotte 2 F. Malek 2 E. Petit 2 J. Stark 2 B. Trocmé 2 M. Wu 2 G. Rahal 3 D. Boumediene 4 E. Busato 4 D. Calvet 4 S. Calvet 4 A.R. Chomont 4 J. Donini 4 Ph. Gris 4 R. Madar 4 D. Pallin 4 S.M. Romano Saez 4 C. Santoni 4 D. Simon 4 F. Vazeille 4 M.K. Ayoub 5 A. Bassalat 5 S. Binet 5 C. Becot 5 C. Bourdarios 5 J.B. de Vivie De Regie 5 D. Delgove 5 L. Duflot 5 M. Escalier 5 L. Fayard 5 D. Fournier 5 E.L. Gkougkousis 5 J.-F. Grivaz 5 T. Guillemin 5 F. Hariri 5 S. Henrot-Versille 5 J. Hrivnac 5 L. Iconomidou-Fayard 5 M. Kado 5 A. Lounis 5 N. Makovec 5 N. Morange 5 C. Nellist 5 P. Petroff 5 L. Poggioli 5 P. Puzo 5 A. Renaud 5 G. Rybkin 5 D. Rousseau 5 A.C. Schaffer 5 L. Serin 5 E. Scifo 5 S. Simion 5 R. Tanaka 5 D. Zerwas 5 Zhongkai Zhang 5 Y. Zhao 5 Z. Barnovska 6 N. Berger 6 M. Delmastro 6 L. Di Ciaccio 6 S. Elles 6 K. Grevtsov 6 T. Hryn’ova 6 S. Jézéquel 6 I. Koletsou 6 R. Lafaye 6 J. Levêque 6 P. Mastrandea 6 G. Sauvage 6 E. Sauvan 6 O. Simard 6 T. Todorov 6 I. Wingerter-Seez 6 E. Yatsenko 6 M. Alstaty 1 M. Barbero 1 A. Calandri 1 T.P. Calvet 1 Y. Coadou 1 C. Diaconu 1 S. Diglio 1 F. Djama 1 V. Ellajosyula 1 L. Feligioni 1 J. Gao 1 A. Hadef 1 G.D. Hallewell 1 F. Hubaut 1 S.J. Kahn 1 E. B. F. G. Knoops 1 E. Le Guirriec 1 J. Liu 1 K. Liu D. Madaffari 1 K. Mochizuki 1 E. Monnier 1 S. Muanza 1 E. Nagy 1 P. Pralavorio 1 Y. Rodina 1 A. Rozanov 1 M. Talby 1 T. Theveneaux-Pelzer 1 R.E. Ticse Torres 1 S. Tisserant 1 J. Toth 1 F. Touchard 1 L. Vacavant 1 Chen Wang 1
Abstract : A search for Higgs boson production in association with a pair of top quarks (tt¯H) is performed, where the Higgs boson decays to bb¯, and both top quarks decay hadronically. The data used correspond to an integrated luminosity of 20.3 fb−1 of pp collisions at s√=8 TeV collected with the ATLAS detector at the Large Hadron Collider. The search selects events with at least six energetic jets and uses a boosted decision tree algorithm to discriminate between signal and Standard Model background. The dominant multijet background is estimated using a dedicated data-driven technique. For a Higgs boson mass of 125 GeV, an upper limit of 6.4 (5.4) times the Standard Model cross section is observed (expected) at 95% confidence level. The best-fit value for the signal strength is μ=1.6±2.6 times the Standard Model expectation for mH=125 GeV. Combining all tt¯H searches carried out by ATLAS at s√=8 and 7 TeV, an observed (expected) upper limit of 3.1 (1.4) times the Standard Model expectation is obtained at 95% confidence level, with a signal strength μ=1.7±0.8.
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Article dans une revue
Journal of High Energy Physics, Springer Verlag (Germany), 2016, 05, pp.160. 〈10.1007/JHEP05(2016)160〉
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Soumis le : jeudi 14 avril 2016 - 08:27:22
Dernière modification le : mardi 5 juin 2018 - 16:40:03

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G. Aad, S. Albrand, S. Berlendis, C. Camincher, J. Collot, et al.. Search for the Standard Model Higgs boson decaying into bb¯ produced in association with top quarks decaying hadronically in pp collisions at s√=8 TeV with the ATLAS detector. Journal of High Energy Physics, Springer Verlag (Germany), 2016, 05, pp.160. 〈10.1007/JHEP05(2016)160〉. 〈in2p3-01302317〉

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