Search for the Standard Model Higgs boson produced in association with top quarks and decaying into $b\bar{b}$ in pp collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector - IN2P3 - Institut national de physique nucléaire et de physique des particules
Article Dans Une Revue European Physical Journal C: Particles and Fields Année : 2015

Search for the Standard Model Higgs boson produced in association with top quarks and decaying into $b\bar{b}$ in pp collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector

G. Aad (1) , S. Albrand (2) , J. Brown (2) , J. Collot (2) , S. Crépé-Renaudin (2) , P.A. Delsart (2) , C. Gabaldon (2) , M.H. Genest (2) , J.Y. Hostachy (2) , F. Ledroit-Guillon (2) , A. Lleres (2) , A. Lucotte (2) , F. Malek (2) , C. Monini (2) , J. Stark (2) , B. Trocmé (2) , M. Wu (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) , H. Liao (4) , R. Madar (4) , D. Pallin (4) , S.M. Romano Saez (4) , C. Santoni (4) , D. Simon (4) , Timothée Theveneaux-Pelzer (4) , F. Vazeille (4) , L. Alio (1) , M. Barbero (1) , Y. Coadou (1) , Sara Diglio (1) , F. Djama (1) , L. Feligioni , J. Gao (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 (1) , D. Madaffari (1) , K. Mochizuki (1) , E. Monnier (1) , S. Muanza (1) , Y. Nagai (1) , E. Nagy (1) , P. Pralavorio (1) , A. Rozanov (1) , T. Serre (1) , M. Talby (1) , R.E. Ticse Torres (1) , E. Tiouchichine (1) , S. Tisserant (1) , F. Touchard (1) , L. Vacavant (1) , O. Ducu (1, 5) , Z. Barnovska (6) , N. Berger (6) , M. Delmastro (6) , L. Di Ciaccio (6) , T.K.O. Doan (6) , S. Elles (6) , T. Hryn’ova (6) , S. Jézéquel (6) , I. Koletsou (6) , R. Lafaye (6) , J. Leveque (6) , N. Massol (6) , G. Sauvage (6) , E. Sauvan (6) , O. Simard (6) , T. Todorov (6) , I. Wingerter-Seez (6) , M.K. Ayoub (7) , A. Bassalat (7) , C. Becot (7) , S. Binet (7) , C. Bourdarios (7) , J.B. de Vivie de Regie (7) , D. Delgove (7) , L. Duflot (7) , M. Escalier (7) , L. Fayard (7) , D. Fournier (7) , E.L. Gkougkousis (7) , J.-F. Grivaz (7) , T. Guillemin (7) , F. Hariri (7) , S. Henrot-Versillé (7) , J. Hrivnac (7) , L. Iconomidou-Fayard (7) , M. Kado (7) , A. Lounis (7) , N. Makovec (7) , N. Morange (7) , C. Nellist (7) , L. Poggioli (7) , P. Puzo (7) , A. Renaud (7) , D. Rousseau (7) , G. Rybkin (7) , A.C. Schaffer (7) , E. Scifo (7) , L. Serin (7) , S. Simion (7) , R. Tanaka (7) , H.L. Tran (7) , D. Zerwas (7) , Z. Zhang (7) , Y. Zhao (7) , C. Diaconu (1)
G. Aad
Y. Coadou
L. Feligioni
  • Fonction : Auteur
E. Monnier
N. Berger
T. Hryn’ova
D. Rousseau
D. Zerwas
  • Fonction : Auteur
  • PersonId : 842996
Z. Zhang

Résumé

A search for the Standard Model Higgs boson produced in association with a pair of top quarks, $t\bar{t}H$, is presented. The analysis uses 20.3 fb$^{-1}$ of pp collision data at $\sqrt{s}$ = 8 TeV, collected with the ATLAS detector at the Large Hadron Collider during 2012. The search is designed for the H to $b\bar{b}$ decay mode and uses events containing one or two electrons or muons. In order to improve the sensitivity of the search, events are categorised according to their jet and b-tagged jet multiplicities. A neural network is used to discriminate between signal and background events, the latter being dominated by $t\bar{t}$+jets production. In the single-lepton channel, variables calculated using a matrix element method are included as inputs to the neural network to improve discrimination of the irreducible $t\bar{t}$+$b\bar{b}$ background. No significant excess of events above the background expectation is found and an observed (expected) limit of 3.4 (2.2) times the Standard Model cross section is obtained at 95% confidence level. The ratio of the measured $t\bar{t}H$ signal cross section to the Standard Model expectation is found to be $\mu$ = 1.5 $\pm$ 1.1 assuming a Higgs boson mass of 125 GeV.

Dates et versions

in2p3-01133670 , version 1 (20-03-2015)

Identifiants

Citer

G. Aad, S. Albrand, J. Brown, J. Collot, S. Crépé-Renaudin, et al.. Search for the Standard Model Higgs boson produced in association with top quarks and decaying into $b\bar{b}$ in pp collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector. European Physical Journal C: Particles and Fields, 2015, 75, pp.349. ⟨10.1140/epjc/s10052-015-3543-1⟩. ⟨in2p3-01133670⟩
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