Search for tt¯H production in the H→bb¯¯¯ decay channel with leptonic tt¯ decays in proton-proton collisions at √s = 13 TeV
Name
Sirunyan2019_Article_SearchForTtHMathrmTOverlineMat.pdf
Size
1.54 MB
Format
Adobe PDF
Checksum (MD5)
8f72414a3a1bae65012fb40e1e82e614
Date Issued
March 2019
Journal
Journal of High Energy Physics
Publisher
Springer
Citation
Sirunyan, A.M. et al. "Search for tt¯H production in the H→bb¯¯¯ decay channel with leptonic tt¯ decays in proton-proton collisions at √s = 13 TeV." Journal of High Energy Physics (March 2019): 26
Version
Final published version
Abstract
A search is presented for the associated production of a standard model Higgs boson with a top quark-antiquark pair (tt¯H), in which the Higgs boson decays into a b quark-antiquark pair, in proton-proton collisions at a centre-of-mass energy √s = 13 TeV. The data correspond to an integrated luminosity of 35.9 fb⁻¹ recorded with the CMS detector at the CERN LHC. Candidate tt¯H events are selected that contain either one or two electrons or muons from the tt¯ decays and are categorised according to the number of jets. Multivariate techniques are employed to further classify the events and eventually discriminate between signal and background. The results are characterised by an observed tt¯H signal strength relative to the standard model cross section, μ = σ/σSM, under the assumption of a Higgs boson mass of 125 GeV. A combined fit of multivariate discriminant distributions in all categories results in an observed (expected) upper limit on μ of 1.5 (0.9) at 95% confidence level, and a best fit value of 0.72 ± 0.24(stat) ± 0.38(syst), corresponding to an observed (expected) signal significance of 1.6 (2.2) standard deviations above the background-only hypothesis.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Terms of Use
Creative Commons Attribution 4.0 International license
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DOI of Published Version
https://doi.org/10.1007/JHEP03(2019)026
