Aad, G;
Abbott, B;
Abdallah, J;
Abdinov, O;
Abeloos, B;
Aben, R;
Abolins, M;
... Zwalinski, L; + view all
(2016)
Search for the Standard Model Higgs boson decaying into b(b)over-bar produced in association with top quarks decaying hadronically in pp collisions at root s=8 TeV with the ATLAS detector.
Journal of High Energy Physics
, 2016
(5)
, Article 160. 10.1007/JHEP05(2016)160.
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Abstract
A search for Higgs boson production in association with a pair of top quarks (tt ¯ H tt¯H ) is performed, where the Higgs boson decays to bb ¯ ¯ 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 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 tt¯H searches carried out by ATLAS at s √ =8 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.
| Type: | Article |
|---|---|
| Title: | Search for the Standard Model Higgs boson decaying into b(b)over-bar produced in association with top quarks decaying hadronically in pp collisions at root s=8 TeV with the ATLAS detector |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1007/JHEP05(2016)160 |
| Publisher version: | http://dx.doi.org/10.1007/JHEP05(2016)160 |
| Language: | English |
| Additional information: | Copyright © The Author(s) 2016. Open Access: This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0) (https://creativecommons.org/licenses/by/4.0/, which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. |
| Keywords: | Hadron-Hadron scattering (experiments) |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/1500640 |
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