Search for t t ¯ H production in the H → b b ¯ decay channel with leptonic t t ¯ decays in proton-proton collisions at √s=13 TeV

The CMS Collaboration

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A search is presented for the associated production of a standard model Higgs boson with a top quark-antiquark pair (t t ¯ 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 t t ¯ H events are selected that contain either one or two electrons or muons from the t t ¯ 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 t t ¯ H signal strength relative to the standard model cross section, μ = σ/σ SM , 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.[Figure not available: see fulltext.].

Original languageEnglish
Article number26
JournalJournal of High Energy Physics
Volume2019
Issue number3
DOIs
Publication statusPublished - 2019 Mar 1

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Higgs bosons
collisions
protons
decay
quarks
center of mass
muons
confidence
standard deviation
luminosity
detectors
cross sections
electrons
energy

Keywords

  • Hadron-Hadron scattering (experiments)
  • Higgs physics
  • Top physics

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Search for t t ¯ H production in the H → b b ¯ decay channel with leptonic t t ¯ decays in proton-proton collisions at √s=13 TeV. / The CMS Collaboration.

In: Journal of High Energy Physics, Vol. 2019, No. 3, 26, 01.03.2019.

Research output: Contribution to journalArticle

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title = "Search for t t ¯ H production in the H → b b ¯ decay channel with leptonic t t ¯ decays in proton-proton collisions at √s=13 TeV",
abstract = "A search is presented for the associated production of a standard model Higgs boson with a top quark-antiquark pair (t t ¯ 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 t t ¯ H events are selected that contain either one or two electrons or muons from the t t ¯ 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 t t ¯ H signal strength relative to the standard model cross section, μ = σ/σ SM , 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.[Figure not available: see fulltext.].",
keywords = "Hadron-Hadron scattering (experiments), Higgs physics, Top physics",
author = "{The CMS Collaboration} and Sirunyan, {A. M.} and A. Tumasyan and W. Adam and F. Ambrogi and E. Asilar and T. Bergauer and J. Brandstetter and M. Dragicevic and J. Er{\"o} and {Escalante Del Valle}, A. and M. Flechl and R. Fr{\"u}hwirth and Ghete, {V. M.} and J. Hrubec and M. Jeitler and N. Krammer and I. Kr{\"a}tschmer and D. Liko and T. Madlener and I. Mikulec and N. Rad and H. Rohringer and J. Schieck and R. Sch{\"o}fbeck and M. Spanring and D. Spitzbart and A. Taurok and W. Waltenberger and J. Wittmann and Wulz, {C. E.} and M. Zarucki and V. Chekhovsky and V. Mossolov and {Suarez Gonzalez}, J. and {De Wolf}, {E. A.} and {Di Croce}, D. and X. Janssen and J. Lauwers and M. Pieters and {Van De Klundert}, M. and {Van Haevermaet}, H. and {Van Mechelen}, P. and {Van Remortel}, N. and {Abu Zeid}, S. and F. Blekman and J. D’Hondt and {De Bruyn}, I. and {De Clercq}, J. and K. Deroover and Byungsik Hong",
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AU - The CMS Collaboration

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AU - Tumasyan, A.

AU - Adam, W.

AU - Ambrogi, F.

AU - Asilar, E.

AU - Bergauer, T.

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AU - Dragicevic, M.

AU - Erö, J.

AU - Escalante Del Valle, A.

AU - Flechl, M.

AU - Frühwirth, R.

AU - Ghete, V. M.

AU - Hrubec, J.

AU - Jeitler, M.

AU - Krammer, N.

AU - Krätschmer, I.

AU - Liko, D.

AU - Madlener, T.

AU - Mikulec, I.

AU - Rad, N.

AU - Rohringer, H.

AU - Schieck, J.

AU - Schöfbeck, R.

AU - Spanring, M.

AU - Spitzbart, D.

AU - Taurok, A.

AU - Waltenberger, W.

AU - Wittmann, J.

AU - Wulz, C. E.

AU - Zarucki, M.

AU - Chekhovsky, V.

AU - Mossolov, V.

AU - Suarez Gonzalez, J.

AU - De Wolf, E. A.

AU - Di Croce, D.

AU - Janssen, X.

AU - Lauwers, J.

AU - Pieters, M.

AU - Van De Klundert, M.

AU - Van Haevermaet, H.

AU - Van Mechelen, P.

AU - Van Remortel, N.

AU - Abu Zeid, S.

AU - Blekman, F.

AU - D’Hondt, J.

AU - De Bruyn, I.

AU - De Clercq, J.

AU - Deroover, K.

AU - Hong, Byungsik

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N2 - A search is presented for the associated production of a standard model Higgs boson with a top quark-antiquark pair (t t ¯ 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 t t ¯ H events are selected that contain either one or two electrons or muons from the t t ¯ 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 t t ¯ H signal strength relative to the standard model cross section, μ = σ/σ SM , 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.[Figure not available: see fulltext.].

AB - A search is presented for the associated production of a standard model Higgs boson with a top quark-antiquark pair (t t ¯ 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 t t ¯ H events are selected that contain either one or two electrons or muons from the t t ¯ 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 t t ¯ H signal strength relative to the standard model cross section, μ = σ/σ SM , 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.[Figure not available: see fulltext.].

KW - Hadron-Hadron scattering (experiments)

KW - Higgs physics

KW - Top physics

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