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Search for resonant and nonresonant Higgs boson pair production in the $\mathrm{b}\overline{\mathrm{b}}\mathit{\ell \nu \ell \nu }$ final state in proton-proton collisions at $\sqrt{s}=13$ TeV

The collaboration
JHEP 1801 (2018) 054, 2018

Abstract (data abstract)
CERN-LHC. Searches for resonant and nonresonant pair-produced Higgs bosons (HH) decaying respectively into lnulnu, through either W or Z bosons, and bbbar. Based on a sample of proton-proton collisions at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of 35.9 fb−1. The main background processes, in decreasing order of importance, are ttbar, Drell-Yan, and single top quark production. Diboson, triboson, ttV and SM single Higgs boson production are also considered. Other contributions, such as W+jets or QCD multijet events with jets misidentified as leptons, are negligible. Background simulation samples have been generated at NLO in QCD using powheg and MadGraph5 amc@nlo with FxFx merging and MadSpin. The signal samples of gluon fusion production of two Higgs bosons, and of spin-0 or spin-2 narrow resonances decaying into two Higgs bosons, have been generated at leading order (LO) in QCD using MadGraph5 amc@nlo version 2.2.2.0. The event generators used for both signal and background samples are interfaced with pythia 8.212. The NNPDF 3.0 LO and NLO Parton Distribution Functions (PDF) are used. Jets are reconstructed using a particle flow (PF) technique. PF candidates are clustered to form jets using the anti-kT clustering algorithm with a distance parameter of 0.4. Region of interest is defined as: - two leptons and two b-tagged jets - (Pt_l1, Pt_l2) > (25GeV,15GeV) for the ee and mue channels - (Pt_l1, Pt_l2) > (20GeV,10GeV) for the mumu channel - (Pt_l1, Pt_l2) > (25GeV,10GeV) for the emu channel - abs(eta_mu) < 2.4 - abs(eta_el) < 2.5 - pT_jet > 20GeV - abs(eta_jet) < 2.4 - Delta_R(jet,lepton)>0.3 - 12 < m_ll < mZ −15 GeV

• #### Figure 2a

Appears on Page 6 of the paper

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The dijet pT distributions in data and simulated events after requiring two leptons, two b-tagged jets, and 12 < m_ll...

• #### Figure 2b

Appears on Page 6 of the paper

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The dijet pT distributions in data and simulated events after requiring two leptons, two b-tagged jets, and 12 < m_ll...

• #### Figure 2c

Appears on Page 6 of the paper

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The dijet pT distributions in data and simulated events after requiring two leptons, two b-tagged jets, and 12 < m_ll...

• #### Figure 4a

Appears on Page 9 of the paper

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The mjj distribution in data and simulated events after requiring all selection criteria in the e+e- channel. The various signal...

• #### Figure 4b

Appears on Page 9 of the paper

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The mjj distribution in data and simulated events after requiring all selection criteria in the e^{+/-}mu^{-/+} channel. The various signal...

• #### Figure 4c

Appears on Page 9 of the paper

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The mjj distribution in data and simulated events after requiring all selection criteria in the mu+mu- channel. The various signal...

• #### Figure 5a

Appears on Page 10 of the paper

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The DNN output distributions in data and simulated events after requiring all selection criteria, in the e+e− channel. Output values...

• #### Figure 5b

Appears on Page 10 of the paper

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The DNN output distributions in data and simulated events after requiring all selection criteria, in the e+e− channel. Output values...

• #### Figure 5c

Appears on Page 10 of the paper

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The DNN output distributions in data and simulated events after requiring all selection criteria, in the e^{+/-}mu^{-/+} channel. Output values...

• #### Figure 5d

Appears on Page 10 of the paper

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The DNN output distributions in data and simulated events after requiring all selection criteria, in the e^{+/-}mu^{-/+} channel. Output values...

• #### Figure 5e

Appears on Page 10 of the paper

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The DNN output distributions in data and simulated events after requiring all selection criteria, in the mu+mu− channel. Output values...

• #### Figure 5f

Appears on Page 10 of the paper

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The DNN output distributions in data and simulated events after requiring all selection criteria, in the mu+mu− channel. Output values...

• #### Figure 6a

Appears on Page 11 of the paper

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The DNN output distributions in data and simulated events, for the e+e- channel, in three different mjj regions. The parameterised...

• #### Figure 6b

Appears on Page 11 of the paper

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The DNN output distributions in data and simulated events, for the e+e- channel, in three different mjj regions. Output values...

• #### Figure 6c

Appears on Page 11 of the paper

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The DNN output distributions in data and simulated events, for the e^{+/-}mu^{-/+} channel, in three different mjj regions. Output values...

• #### Figure 6d

Appears on Page 11 of the paper

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The DNN output distributions in data and simulated events, for the e^{+/-}mu^{-/+} channel, in three different mjj regions. Output values...

• #### Figure 6e

Appears on Page 11 of the paper

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The DNN output distributions in data and simulated events, for the mu+mu- channel, in three different mjj regions. Output values...

• #### Figure 6f

Appears on Page 11 of the paper

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The DNN output distributions in data and simulated events, for the mu+mu- channel, in three different mjj regions. Output values...

• #### Figure 7a

Appears on Page 15 of the paper

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Expected and observed 95% CL upper limits on the product of the production cross section for X and branching fraction...

• #### Figure 7b

Appears on Page 15 of the paper

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Expected and observed 95% CL upper limits on the product of the production cross section for X and branching fraction...

• #### Figure 8a

Appears on Page 16 of the paper

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expected and observed 95% CL upper limits on the product of the Higgs boson pair production cross section and branching...

• #### Figure 8b

Appears on Page 16 of the paper

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Exclusions in the (\kappa_top, \kappa_\lambda) plane. Parameters excluded at 95% CL with the observed data, and expected exclusions and the...