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Measurements of jet vetoes and azimuthal decorrelations in dijet events produced in $pp$ collisions at $\sqrt{s}=7\,\mathrm{TeV}$ using the ATLAS detector

The collaboration
Eur.Phys.J. C74 (2014) 3117, 2014

Abstract (data abstract)
CERN-LHC. Additional jet activity in dijet events is measured using $pp$ collisions at ATLAS at a centre-of-mass energy of 7 TeV, for jets reconstructed using the anti-kt algorithm with radius parameter R=0.6. This is done using variables such as the fraction of dijet events without an additional jet in the rapidity interval bounded by the dijet subsystem and correlations between the azimuthal angles of the dijets. They are presented, both with and without a veto on additional jet activity in the rapidity interval, as a function of the mean transverse momentum of the dijets and of the rapidity interval size. The double differential dijet cross section is also measured as a function of the interval size and the azimuthal angle between the dijets. These variables probe differences in the approach to resummation of large logarithms when performing QCD calculations. The data are compared to POWHEG, interfaced to the PYTHIA 8 and HERWIG parton shower generators, as well as to HEJ with and without interfacing it to the ARIADNE parton shower generator. None of the theoretical predictions agree with the data across the full phase-space considered; however, POWHEG+PYTHIA 8 and HEJ+ARIADNE are found to provide the best agreement with the data.These measurements use the full data sample collected with the ATLAS detector in 7 TeV $pp$ collisions at the LHC and correspond to integrated luminosities of 36.1 pb$^{-1}$ and 4.5 fb$^{-1}$ for data collected during 2010 and 2011 respectively.

• #### Table 1

Data from Fig. 3a

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Gap fraction as a function of leading dijet rapidity separation.

• #### Table 2

Data from Fig. 3b

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Gap fraction as a function of leading dijet scalar mean pT in GeV.

• #### Table 3

Data from Fig. 4a

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Mean number of jets in rapidity interval as a function of leading dijet rapidity separation.

• #### Table 4

Data from Fig. 4b

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Mean number of jets in rapidity interval as a function of leading dijet scalar mean pT in GeV.

• #### Table 5

Data from Fig. 5a

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First azimuthal angular moment as a function of leading dijet rapidity separation.

• #### Table 6

Data from Fig. 5b

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First azimuthal angular moment as a function of leading dijet scalar mean pT in GeV.

• #### Table 7

Data from Fig. 5c

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Ratio of second azimuthal angular moment to first as a function of leading dijet rapidity separation.

• #### Table 8

Data from Fig. 5d

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Ratio of second azimuthal angular moment to first as a function of leading dijet scalar mean pT in GeV.

• #### Table 9

Data from Fig. 6a

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First azimuthal angular moment as a function of leading dijet rapidity separation.

• #### Table 10

Data from Fig. 6b

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First azimuthal angular moment as a function of leading dijet scalar mean pT in GeV.

• #### Table 11

Data from Fig. 6c

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Ratio of second azimuthal angular moment to first as a function of leading dijet rapidity separation.

• #### Table 12

Data from Fig. 6d

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Ratio of second azimuthal angular moment to first as a function of leading dijet scalar mean pT in GeV.

• #### Table 13

Data from Fig. 7

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Differential cross section as a function of dijet azimuthal separation for events satisfying 0 < dijet rapidity separation <= 1.

• #### Table 14

Data from Fig. 7

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Differential cross section as a function of dijet azimuthal separation for events satisfying 1 < dijet rapidity separation <= 2.

• #### Table 15

Data from Fig. 7

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Differential cross section as a function of dijet azimuthal separation for events satisfying 2 < dijet rapidity separation <= 3.

• #### Table 16

Data from Fig. 7

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Differential cross section as a function of dijet azimuthal separation for events satisfying 3 < dijet rapidity separation <= 4.

• #### Table 17

Data from Fig. 7

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Differential cross section as a function of dijet azimuthal separation for events satisfying 4 < dijet rapidity separation <= 5.

• #### Table 18

Data from Fig. 7

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Differential cross section as a function of dijet azimuthal separation for events satisfying 5 < dijet rapidity separation <= 6.

• #### Table 19

Data from Fig. 7

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Differential cross section as a function of dijet azimuthal separation for events satisfying 6 < dijet rapidity separation <= 7.

• #### Table 20

Data from Fig. 7

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Differential cross section as a function of dijet azimuthal separation for events satisfying 7 < dijet rapidity separation <= 8.

• #### Table 21

Data from Fig. 8

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Differential cross section as a function of dijet azimuthal separation for events satisfying 0 < dijet rapidity separation <= 1.

• #### Table 22

Data from Fig. 8

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Differential cross section as a function of dijet azimuthal separation for events satisfying 1 < dijet rapidity separation <= 2.

• #### Table 23

Data from Fig. 8

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Differential cross section as a function of dijet azimuthal separation for events satisfying 2 < dijet rapidity separation <= 3.

• #### Table 24

Data from Fig. 8

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Differential cross section as a function of dijet azimuthal separation for events satisfying 3 < dijet rapidity separation <= 4.

• #### Table 25

Data from Fig. 8

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Differential cross section as a function of dijet azimuthal separation for events satisfying 4 < dijet rapidity separation <= 5.

• #### Table 26

Data from Fig. 8

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Differential cross section as a function of dijet azimuthal separation for events satisfying 5 < dijet rapidity separation <= 6.

• #### Table 27

Data from Fig. 8

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Differential cross section as a function of dijet azimuthal separation for events satisfying 6 < dijet rapidity separation <= 7.

• #### Table 28

Data from Fig. 8

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Differential cross section as a function of dijet azimuthal separation for events satisfying 7 < dijet rapidity separation <= 8.

• #### Table 29

Data from Fig. 14

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Gap fraction as a function of veto scale in GeV for events satisfying 0 < dijet rapidity separation <= 1.

• #### Table 30

Data from Fig. 14

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Gap fraction as a function of veto scale in GeV for events satisfying 1 < dijet rapidity separation <= 2.

• #### Table 31

Data from Fig. 14

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Gap fraction as a function of veto scale in GeV for events satisfying 2 < dijet rapidity separation <= 3.

• #### Table 32

Data from Fig. 14

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Gap fraction as a function of veto scale in GeV for events satisfying 3 < dijet rapidity separation <= 4.

• #### Table 33

Data from Fig. 14

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Gap fraction as a function of veto scale in GeV for events satisfying 4 < dijet rapidity separation <= 5.

• #### Table 34

Data from Fig. 14

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Gap fraction as a function of veto scale in GeV for events satisfying 5 < dijet rapidity separation <= 6.

• #### Table 35

Data from Fig. 14

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Gap fraction as a function of veto scale in GeV for events satisfying 6 < dijet rapidity separation <= 7.

• #### Table 36

Data from Fig. 14

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Gap fraction as a function of veto scale in GeV for events satisfying 7 < dijet rapidity separation <= 8.

• #### Table 37

Data from Fig. 15a

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Second azimuthal angular moment as a function of leading dijet rapidity separation.

• #### Table 38

Data from Fig. 15b

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Second azimuthal angular moment as a function of leading dijet scalar mean pT in GeV.

• #### Table 39

Data from Fig. 15c

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Second azimuthal angular moment as a function of leading dijet rapidity separation.

• #### Table 40

Data from Fig. 15d

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Second azimuthal angular moment as a function of leading dijet scalar mean pT in GeV.