Abstract (data abstract)
A study of inclusive four-jet production in proton-proton collisions at a center-of-mass energy of 13 TeV is presented. The transverse momentum of jets within abs(eta) < 4.7 reaches down to 35, 30, 25, and 20 GeV for the first-, second-, third-, and fourth-leading jet, respectively. Differential cross sections are measured as functions of the jet transverse momentum and pseudorapidity, and several other observables that describe the angular correlations between the jets. It is found that the measured distributions show sensitivity to different aspects of the underlying event, parton shower, and matrix element calculations. In particular, the interplay between decorrelations caused by parton shower and double-parton scattering contributions is shown to be important. The double-parton scattering contribution is extracted by means of a template fit of the distributions for single-parton scattering obtained from Monte Carlo event generators and a double-parton scattering distribution constructed from inclusive single-jet events in data. Values of the effective cross section are calculated and discussed in view of previous measurements and of their dependence on the models used to describe the single-parton scattering background.

  • Figure 2a

    Data from Figure 2 (top left), located on page 13.

    Comparison of the pT spectrum for the leading jet from data to different PYTHIA8 (P8),HERWIG++ (H++),and HERWIG7 (H7) tunes.

  • Figure 2b

    Data from Figure 2 (top right), located on page 13.

    Comparison of the pT spectrum for the sub-leading from data to different PYTHIA8 (P8),HERWIG++ (H++),and HERWIG7 (H7) tunes.

  • Figure 2c

    Data from Figure 2 (bottom left), located on page 13.

    Comparison of the pT spectrum for the third-leading from data to different PYTHIA8 (P8),HERWIG++ (H++),and HERWIG7 (H7) tunes.

  • Figure 2d

    Data from Figure 2 (bottom right), located on page 13.

    Comparison of the pT spectrum for the fourth-leading from data to different PYTHIA8 (P8),HERWIG++ (H++),and HERWIG7 (H7) tunes.

  • Figure 3a

    Data from Figure 3 (top left), located on page 14.

    Comparison of the eta spectrum for the leading jet from data to different PYTHIA8 (P8),HERWIG++ (H++),and HERWIG7 (H7) tunes.

  • Figure 3b

    Data from Figure 3 (top right), located on page 14.

    Comparison of the eta spectrum for the sub-leading from data to different PYTHIA8 (P8),HERWIG++ (H++),and HERWIG7 (H7) tunes.

  • Figure 3c

    Data from Figure 3 (bottom left), located on page 14.

    Comparison of the eta spectrum for the third-leading from data to different PYTHIA8 (P8),HERWIG++ (H++),and HERWIG7 (H7) tunes.

  • Figure 3d

    Data from Figure 3 (bottom right), located on page 14.

    Comparison of the eta spectrum for the fourth-leading from data to different PYTHIA8 (P8),HERWIG++ (H++),and HERWIG7 (H7) tunes.

  • Figure 4a

    Data from Figure 4 (top left), located on page 15.

    Comparison of the DeltaPhiSoft distribution from data to different PYTHIA8 (P8),HERWIG++ (H++), and HERWIG7 (H7) tunes. All distributions have been...

  • Figure 4b

    Data from Figure 4 (top right), located on page 15.

    Comparison of the DeltaPhiMin distribution from data to different PYTHIA8 (P8),HERWIG++ (H++), and HERWIG7 (H7) tunes. All distributions have been...

  • Figure 4c

    Data from Figure 4 (bottom left), located on page 15.

    Comparison of the DeltaY distribution from data to different PYTHIA8 (P8),HERWIG++ (H++), and HERWIG7 (H7) tunes. All distributions have been...

  • Figure 4d

    Data from Figure 4 (bottom right), located on page 15.

    Comparison of the phi_ij distribution from data to different PYTHIA8 (P8),HERWIG++ (H++), and HERWIG7 (H7) tunes. All distributions have been...

  • Figure 5a

    Data from Figure 5 (left), located on page 16.

    Comparison of the Deltap_{T,Soft} distribution from data to different PYTHIA 8 (P8), HERWIG ++ (H++), and HERWIG 7 (H7) tunes....

  • Figure 5b

    Data from Figure 5 (right), located on page 16.

    Comparison of the DeltaS distribution from data to different PYTHIA 8 (P8), HERWIG ++ (H++), and HERWIG 7 (H7) tunes....

  • Figure 6a

    Data from Figure 6 (top left), located on page 19.

    Comparison of the pT spectrum for the leading jet from data with different KATIE(KT), MADGRAPH5aMC@NLO(MG5), and POWHEG(PW) models

  • Figure 6b

    Data from Figure 6 (top right), located on page 19.

    Comparison of the pT spectrum for the sub-leading from data with different KATIE(KT), MADGRAPH5aMC@NLO(MG5), and POWHEG(PW) models

  • Figure 6c

    Data from Figure 6 (bottom left), located on page 19.

    Comparison of the pT spectrum for the third-leading from data to different PYTHIA8 (P8),HERWIG++ (H++),and HERWIG7 (H7) tunes.

  • Figure 6d

    Data from Figure 6 (bottom right), located on page 19.

    Comparison of the pT spectrum for the fourth-leading from data with different KATIE(KT), MADGRAPH5aMC@NLO(MG5), and POWHEG(PW) models

  • Figure 7a

    Data from Figure 7 (top left), located on page 20.

    Comparison of the eta spectrum for the leading jet from data with different KATIE(KT), MADGRAPH5aMC@NLO(MG5), and POWHEG(PW) models

  • Figure 7b

    Data from Figure 7 (top right), located on page 20.

    Comparison of the eta spectrum for the sub-leading from data with different KATIE(KT), MADGRAPH5aMC@NLO(MG5), and POWHEG(PW) models

  • Figure 7c

    Data from Figure 7 (bottom left), located on page 20.

    Comparison of the eta spectrum for the third-leading from data with different KATIE(KT), MADGRAPH5aMC@NLO(MG5), and POWHEG(PW) models

  • Figure 7d

    Data from Figure 7 (bottom right), located on page 20.

    Comparison of the eta spectrum for the fourth-leading from data with different KATIE(KT), MADGRAPH5aMC@NLO(MG5), and POWHEG(PW) models

  • Figure 8a

    Data from Figure 8 (top left), located on page 21.

    Comparison of the DeltaPhiSoft distribution from data to differentKATIE(KT), MADGRAPH5aMC@NLO(MG5), andPOWHEG(PW) implementations. All distributions have been normalized to regions where...

  • Figure 8b

    Data from Figure 8 (top right), located on page 21.

    Comparison of the DeltaPhiMin, distribution from data to differentKATIE(KT), MADGRAPH5aMC@NLO(MG5), andPOWHEG(PW) implementations. All distributions have been normalized to regions where...

  • Figure 8c

    Data from Figure 8 (bottom left), located on page 21.

    Comparison of the DeltaY and distribution from data to differentKATIE(KT), MADGRAPH5aMC@NLO(MG5), andPOWHEG(PW) implementations. All distributions have been normalized to regions...

  • Figure 8d

    Data from Figure 8 (bottom right), located on page 21.

    Comparison of the phi_ij distribution from data to differentKATIE(KT), MADGRAPH5aMC@NLO(MG5), andPOWHEG(PW) implementations. All distributions have been normalized to regions where...

  • Figure 9a

    Data from Figure 9 (left), located on page 22.

    Comparison of the Deltap_{T,Soft} distribution from data to different KATIE(KT),MADGRAPH5aMC@NLO(MG5), andPOWHEG(PW) implementations. All distributions havebeen normalized to regions where a...

  • Figure 9b

    Data from Figure 9 (right), located on page 22.

    Comparison of the DeltaS distribution from data to different KATIE(KT),MADGRAPH5aMC@NLO(MG5), andPOWHEG(PW) implementations. All distributions havebeen normalized to regions where a...

  • Figure 10a

    Data from Figure 10 (top left), located on page 24.

    Comparison of the pT spectrum for the leading jet from data with different SPS+DPS KATIE( KT) and PYTHIA8 (P8) models.

  • Figure 10b

    Data from Figure 10 (top right), located on page 24.

    Comparison of the pT spectrum for the sub-leading from data with different SPS+DPS KATIE( KT) and PYTHIA8 (P8) models.

  • Figure 10c

    Data from Figure 10 (bottom left), located on page 24.

    Comparison of the pT spectrum for the third-leading from data with different SPS+DPS KATIE( KT) and PYTHIA8 (P8) models.

  • Figure 10d

    Data from Figure 10 (bottom right), located on page 24.

    Comparison of the pT spectrum for the fourth-leading from data with different SPS+DPS KATIE( KT) and PYTHIA8 (P8) models.

  • Figure 11a

    Data from Figure 11 (top left), located on page 25.

    Comparison of the eta spectrum for the leading jet from data with different SPS+DPS KATIE( KT) and PYTHIA8 (P8) models.

  • Figure 11b

    Data from Figure 11 (top right), located on page 25.

    Comparison of the eta spectrum for the sub-leading from data with different SPS+DPS KATIE( KT) and PYTHIA8 (P8) models.

  • Figure 11c

    Data from Figure 11 (bottom left), located on page 25.

    Comparison of the eta spectrum for the third-leading from data with different SPS+DPS KATIE( KT) and PYTHIA8 (P8) models.

  • Figure 11d

    Data from Figure 11 (bottom right), located on page 25.

    Comparison of the eta spectrum for the fourth-leading from data with different SPS+DPS KATIE( KT) and PYTHIA8 (P8) models.

  • Figure 12a

    Data from Figure 12 (top left), located on page 26.

    Comparison of the DeltaPhiSoft distribution from data to different SPS+DPS KATIE (KT) and PYTHIA 8 (P8) models. All distributions have...

  • Figure 12b

    Data from Figure 12 (top right), located on page 26.

    Comparison of the DeltaPhiMin distribution from data to different SPS+DPS KATIE (KT) and PYTHIA 8 (P8) models. All distributions have...

  • Figure 12c

    Data from Figure 12 (middle left), located on page 26.

    Comparison of the DeltaY distribution from data to different SPS+DPS KATIE (KT) and PYTHIA 8 (P8) models. All distributions have...

  • Figure 12d

    Data from Figure 12 (middle right), located on page 26.

    Comparison of the phi_ij distribution from data to different SPS+DPS KATIE (KT) and PYTHIA 8 (P8) models. All distributions have...

  • Figure 12e

    Data from Figure 12 (bottom left), located on page 26.

    Comparison of the Deltap_{T,Soft} distributions from data to different SPS+DPS KATIE (KT) and PYTHIA 8 (P8) models. All distributions havebeen...

  • Figure 12f

    Data from Figure 12 (bottom right), located on page 26.

    Comparison of the DeltaS distributions from data to different SPS+DPS KATIE (KT) and PYTHIA 8 (P8) models. All distributions have...

  • Figure 13

    Data from Figure 13, located on page 28.

    The DeltaS distribution obtained from the mixed data sample compared to predictions from the pure DPS sample in PYTHIA 8...

  • Figure 14

    Data from Figure 14, located on page 29.

    The results of the template fit for the POWHEG (PW) NLO 2 -> 2 model without the hard MPI removed....

  • Figure 4a (supplementary)

    Supplementary data to Figure 4 (top left), located on page 15.

    Comparison of the DeltaPhiSoft distribution from data to different PYTHIA8 (P8),HERWIG++ (H++), and HERWIG7 (H7) tunes.

  • Figure 4b (supplementary)

    Supplementary data to igure 4 (top right), located on page 15.

    Comparison of the DeltaPhiMin distribution from data to different PYTHIA8 (P8),HERWIG++ (H++), and HERWIG7 (H7) tunes.

  • Figure 4c (supplementary)

    Supplementary data to Figure 4 (bottom left), located on page 15.

    Comparison of the DeltaY distribution from data to different PYTHIA8 (P8),HERWIG++ (H++), and HERWIG7 (H7) tunes.

  • Figure 4d (supplementary)

    Supplementary data to Figure 4 (bottom right), located on page 15.

    Comparison of the phi_ij distribution from data to different PYTHIA8 (P8),HERWIG++ (H++), and HERWIG7 (H7) tunes.

  • Figure 5a (supplementary)

    Supplementary data to Figure 5 (left), located on page 16.

    Comparison of the Deltap_{T,Soft} distribution from data to different PYTHIA 8 (P8), HERWIG ++ (H++), and HERWIG 7 (H7) tunes.

  • Figure 5b (supplementary)

    Supplementary data to Figure 5 (right), located on page 16.

    Comparison of the DeltaS distribution from data to different PYTHIA 8 (P8), HERWIG ++ (H++), and HERWIG 7 (H7) tunes.

  • Figure 8a (supplementary)

    Supplementary data to Figure 8 (top left), located on page 21.

    Comparison of the DeltaPhiSoft distribution from data to different KATIE(KT),MADGRAPH5aMC@NLO(MG5), andPOWHEG(PW) implementations.

  • Figure 8b (supplementary)

    Supplementary data to igure 8 (top right), located on page 21.

    Comparison of the DeltaPhiMin distribution from data to different KATIE(KT),MADGRAPH5aMC@NLO(MG5), andPOWHEG(PW) implementations.

  • Figure 8c (supplementary)

    Supplementary data to Figure 8 (bottom left), located on page 21.

    Comparison of the DeltaY distribution from data to different KATIE(KT),MADGRAPH5aMC@NLO(MG5), andPOWHEG(PW) implementations.

  • Figure 8d (supplementary)

    Supplementary data to Figure 8 (bottom right), located on page 21.

    Comparison of the phi_ij distribution from data to different KATIE(KT),MADGRAPH5aMC@NLO(MG5), andPOWHEG(PW) implementations.

  • Figure 9a (supplementary)

    Supplementary data to Figure 9 (left), located on page 22.

    Comparison of the Deltap_{T,Soft} distribution from data to different KATIE(KT),MADGRAPH5aMC@NLO(MG5), andPOWHEG(PW) implementations.

  • Figure 9b (supplementary)

    Supplementary data to Figure 9 (right), located on page 22.

    Comparison of the DeltaS distribution from data to different KATIE(KT),MADGRAPH5aMC@NLO(MG5), andPOWHEG(PW) implementations.

  • Figure 12a (supplementary)

    Supplementary data to Figure 12 (top left), located on page 26.

    Comparison of the DeltaPhiSoft distribution from data to different SPS+DPS KATIE (KT) and PYTHIA 8 (P8) models.

  • Figure 12b (supplementary)

    Supplementary data to igure 12 (top right), located on page 26.

    Comparison of the DeltaPhiMin distribution from data to different SPS+DPS KATIE (KT) and PYTHIA 8 (P8) models.

  • Figure 12c (supplementary)

    Supplementary data to Figure 12 (bottom left), located on page 26.

    Comparison of the DeltaY distribution from data to different SPS+DPS KATIE (KT) and PYTHIA 8 (P8) models.

  • Figure 12d (supplementary)

    Supplementary data to Figure 12 (bottom right), located on page 26.

    Comparison of the phi_ij distribution from data to different SPS+DPS KATIE (KT) and PYTHIA 8 (P8) models.

  • Figure 12e (supplementary)

    Supplementary data to Figure 12 (left), located on page 26.

    Comparison of the Deltap_{T,Soft} distribution from data to different SPS+DPS KATIE (KT) and PYTHIA 8 (P8) models.

  • Figure 12f (supplementary)

    Supplementary data to Figure 12 (bottom right), located on page 26.

    Comparison of the DeltaS distributions from data to different SPS+DPS KATIE (KT) and PYTHIA 8 (P8) models.

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