Search for resonant and non-resonant Higgs boson pair production in the $b\bar b\tau^+\tau^-$ decay channel using 13 TeV $pp$ collision data from the ATLAS detector

The ATLAS collaboration
JHEP 07 (2023) 040, 2023.

Abstract (data abstract)
A search for Higgs boson pair production in events with two b-jets and two tau-leptons is presented, using a proton--proton collision data set with an integrated luminosity of 139 fb−1 collected at sqrt(s)=13 TeV by the ATLAS experiment at the LHC. Higgs boson pairs produced non-resonantly or in the decay of a narrow-width scalar resonance in the mass range 251 to 1600 GeV are targeted. Events in which at least one tau-lepton decays hadronically are considered, and multivariate discriminants are used to reject the backgrounds. No significant excess of events above the expected background is observed in the non-resonant search. The largest excess in the resonant search is observed at a resonance mass of 1 TeV, with a local (global) significance of 3.1 sigma (2.0 sigma). Observed (expected) upper limits are set at the 95% confidence-level on the non-resonant Higgs boson pair production cross-section of 4.7 (3.9+1.5−1.1) times the Standard Model prediction, assuming Standard Model kinematics, and on the resonant Higgs boson pair production cross-section between 21 and 900 fb (12 and 840 fb), depending on the heavy resonance mass.

  • Table 4

    data from table 4

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    Breakdown of the relative contributions to the uncertainty in the extracted signal cross-sections, as determined in the likelihood fit (described...

  • Table 5

    data from table 5

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    Post-fit expected number of signal and background events and observed number of data events in the last two bins of...

  • Table 6

    data from table 6

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    Observed and expected upper limits at 95% CL on the cross-section of non-resonant HH production according to SM-like kinematics, and...

  • Table 7

    data from table 7

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    Cumulative efficiency for simulated signal events to pass each stage of the event selection in the hadhad category. The efficiencies...

  • Table 8

    data from table 8

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    Cumulative efficiency for simulated signal events to pass each stage of the event selection in the lephad SLT category. The...

  • Table 9

    data from table 9

    10.17182/hepdata.130794.v1/t6

    Cumulative efficiency for simulated signal events to pass each stage of the event selection in the lephad LTT category. The...

  • Table 10

    data from table 10

    10.17182/hepdata.130794.v1/t7

    Post-fit expected number of signal and background events and observed number of data events after applying the selection criteria and...

  • Table 15

    data from table 15

    10.17182/hepdata.130794.v1/t8

    Observed and expected limits at 95% CL on the cross-section of HH production, for the non-resonant ggF+VBF HH search, and...

  • Figure 2

    data from figure 2

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    Acceptance times efficiency for the full analysis selections as a function of the resonance mass mX in the hadhad, lephad...

  • Figure 3a

    data from figure 3a

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    Post-fit distribution of mHH in the hadhad channel.

  • Figure 3b

    data from figure 3b

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    Post-fit distribution of mHH in the lephad SLT channel.

  • Figure 3c

    data from figure 3c

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    Post-fit distribution of mHH in the lephad LTT channel.

  • Figure 3d

    data from figure 3d

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    Post-fit distribution of mtautau MMC in the hadhad channel.

  • Figure 3e

    data from figure 3e

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    Post-fit distribution of mtautau MMC in the hadhad channel.

  • Figure 3f

    data from figure 3f

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    Post-fit distribution of mtautau MMC in the hadhad channel.

  • Figure 3g

    data from figure 3g

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    Post-fit distribution of of di-b-jet mass in the hadhad channel.

  • Figure 3h

    data from figure 3h

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    Post-fit distribution of di-b-jet mass in the LTT lephad channel.

  • Figure 3i

    data from figure 3i

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    Post-fit distribution of di-b-jet mass in the LTT lephad channel.

  • Figure 8a

    data from figure 8a

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    BDT for SM HH in the hadhad channel

  • Figure 8b

    data from figure 8b

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    NN for SM HH in the lephad SLT channel

  • Figure 8c

    data from figure 8c

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    NN for SM HH in the lephad LTT channel

  • Figure 8d

    data from figure 8d

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    PNN for mX = 500 GeV resonant HH in the hadhad channel

  • Figure 8e

    data from figure 8e

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    PNN for mX = 500 GeV resonant HH in the lephad SLT channel

  • Figure 8f

    data from figure 8f

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    PNN for mX = 500 GeV resonant HH in the lephad LTT channel

  • Figure 8g

    data from figure 8g

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    PNN for mX = 1000 GeV resonant HH in the hadhad channel

  • Figure 8h

    data from figure 8h

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    PNN for mX = 1000 GeV resonant HH in the lephad SLT channel

  • Figure 8i

    data from figure 8i

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    PNN for mX = 1000 GeV resonant HH in the lephad LTT channel

  • Figure 9

    data from figure 9

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    Event yields as a function of log10(S/B) for data, background and non-resonant HH signal. Final discriminant bins from the hadhad,...

  • Figure 10

    data from figure 10

    10.17182/hepdata.130794.v1/t29

    Observed and expected limits at 95% CL on the cross-section of the resonant HH production as a function of the...

  • Figure 13a

    data from figure 13a

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    Post-fit distribution of delta-R between the taus in the hadhad channel.

  • Figure 13b

    data from figure 13b

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    Post-fit distribution of delta-R between the b-tagged jets in the hadhad channel.

  • Figure 14a

    data from figure 14a

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    Post-fit distribution of delta-R between the taus in the lephad SLT channel.

  • Figure 14b

    data from figure 14b

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    Post-fit distribution of delta-R between the b-tagged jets in the lephad SLT channel.

  • Figure 14c

    data from figure 14c

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    Post-fit distribution of delta-pT between the tau and lepton in the lephad SLT channel.

  • Figure 14d

    data from figure 14d

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    Post-fit distribution of pT of the subleading b-tagged jet in the lephad SLT channel.

  • Figure 14e

    data from figure 14e

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    Post-fit distribution of MTW in the lephad SLT channel.

  • Figure 14f

    data from figure 14f

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    Post-fit distribution of missing transverse momentum in the lephad SLT channel.

  • Figure 14g

    data from figure 14g

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    Post-fit distribution of missing transverse momentum centrality in the lephad SLT channel.

  • Figure 14h

    data from figure 14h

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    Post-fit distribution of delta-phi between the Higgs boson candidates in the lephad SLT channel.

  • Figure 15a

    data from figure 15a

    10.17182/hepdata.130794.v1/t40

    Post-fit distribution of delta-pT between the tau and lepton in the lephad LTT channel.

  • Figure 15b

    data from figure 15b

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    Post-fit distribution of delta-R between the taus in the lephad LTT channel.

  • Figure 15c

    data from figure 15c

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    Post-fit distribution of delta-phi between the lepton and the missing transverse momentum in the lephad LTT channel.

  • Figure 15d

    data from figure 15d

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    Post-fit distribution of delta-phi between the Higgs boson candidates in the lephad LTT channel.

  • Figure 15e

    data from figure 15e

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    Post-fit distribution of the total transverse momentum s in the lephad LTT channel.

  • Figure 16a

    data from figure 16a

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    PNN for mX = 300 GeV resonant HH in the hadhad channel

  • Figure 16b

    data from figure 16b

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    PNN for mX = 300 GeV resonant HH in the lephad SLT channel

  • Figure 16c

    data from figure 16c

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    PNN for mX = 300 GeV resonant HH in the lephad LTT channel

  • Figure 16d

    data from figure 16d

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    PNN for mX = 1600 GeV resonant HH in the hadhad channel

  • Figure 16e

    data from figure 16e

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    PNN for mX = 1600 GeV resonant HH in the lephad SLT channel

  • Figure 16f

    data from figure 16f

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    PNN for mX = 1600 GeV resonant HH in the lephad LTT channel

  • Figure 24

    data from figure 24

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    Local p-value of the background-only hypothesis as a function of the resonance mass.

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