Publication
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
| dc.contributor.author | ATLAS collaboration (2824 authors) | |
| dc.contributor.author | Aguilar-Saavedra, Juan Antonio | |
| dc.contributor.author | Amor Dos Santos, Susana Patricia | |
| dc.contributor.author | Anjos, Nuno | |
| dc.contributor.author | Araque, Juan Pedro | |
| dc.contributor.author | Cantrill, Robert | |
| dc.contributor.author | Carvalho, João | |
| dc.contributor.author | Castro, Nuno Filipe | |
| dc.contributor.author | Conde Muiño, Patricia | |
| dc.contributor.author | Da Cunha Sargedas De Sousa, Mario Jose | |
| dc.contributor.author | Fiolhais, Miguel | |
| dc.contributor.author | Galhardo, Bruno | |
| dc.contributor.author | Gomes, Agostinho | |
| dc.contributor.author | Gonçalo, Ricardo | |
| dc.contributor.author | Jorge, Pedro | |
| dc.contributor.author | Lopes, Lourenco | |
| dc.contributor.author | Machado Miguens, Joana | |
| dc.contributor.author | Maio, Amélia | |
| dc.contributor.author | Maneira, José | |
| dc.contributor.author | Onofre, António | |
| dc.contributor.author | Palma, Alberto | |
| dc.contributor.author | Pedro, Rute | |
| dc.contributor.author | Pina, João Antonio | |
| dc.contributor.author | Pinto, Belmiro | |
| dc.contributor.author | Santos, Helena | |
| dc.contributor.author | Saraiva, João | |
| dc.contributor.author | Silva, José | |
| dc.contributor.author | Tavares Delgado, Ademar | |
| dc.contributor.author | Veloso, Filipe | |
| dc.contributor.author | Wolters, Helmut | |
| dc.date.accessioned | 2019-02-04T06:22:11Z | |
| dc.date.available | 2019-02-04T06:22:11Z | |
| dc.date.issued | 2015-07-29 | |
| dc.date.updated | 2019-02-04T06:22:11Z | |
| dc.description.abstract | A search for the Standard Model Higgs boson produced in association with a top-quark pair, $t\bar{t}H$ , is presented. The analysis uses 20.3 fb$^{−1}$ of pp collision data at $\sqrt{s}=8{{\,\mathrm TeV}}$ , collected with the ATLAS detector at the Large Hadron Collider during 2012. The search is designed for the $H \rightarrow b\bar{b}$ 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 ${{\,\mathrm GeV\,}}$ . | |
| dc.description.version | Peer Reviewed | |
| dc.identifier | Eur.Phys.J. C75 (2015) 349; DOI 10.1140/epjc/s10052-015-3543-1 | |
| dc.identifier.uri | http://dx.doi.org/10.1140/epjc/s10052-015-3543-1 | |
| dc.identifier.uri | http://hdl.handle.net/10400.26/26804 | |
| dc.language.iso | eng | |
| dc.title | 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 | |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| rcaap.rights | openAccess | pt |
| rcaap.type | article |