10.1140-epjc-s10052-015-3543-1.pdf (3.9 MB)
Search for the Standard Model Higgs boson produced in association with top quarks and decaying into bb¯ in pp collisions at vs=8 TeV with the ATLAS detector
journal contribution
posted on 2023-06-09, 05:57 authored by Benedict AllbrookeBenedict Allbrooke, Lily AsquithLily Asquith, Alessandro CerriAlessandro Cerri, C A Chavez Barajas, Antonella De SantoAntonella De Santo, Fabrizio SalvatoreFabrizio Salvatore, I Santoyo Castillo, K Suruliz, Mark SuttonMark Sutton, Iacopo Vivarelli, et al. The ATLAS CollaborationA search for the Standard Model Higgs boson produced in association with a top-quark pair, tt¯H, is presented. The analysis uses 20.3 fb-1 of pp collision data at vs=8TeV, collected with the ATLAS detector at the Large Hadron Collider during 2012. The search is designed for the H?bb¯ 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 tt¯+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 tt¯+bb¯ 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 tt¯H signal cross section to the Standard Model expectation is found to be µ=1.5±1.1 assuming a Higgs boson mass of 125GeV.
Funding
ATLAS; G0275; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/I006048/1
History
Publication status
- Published
File Version
- Published version
Journal
European Physical Journal CISSN
1434-6044Publisher
Springer VerlagExternal DOI
Issue
349Volume
75Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Experimental Particle Physics Research Group Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2017-04-27First Open Access (FOA) Date
2017-04-27First Compliant Deposit (FCD) Date
2017-04-27Usage metrics
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