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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 ATLAS 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

    10.17182/hepdata.66091.v1/t1

    Gap fraction as a function of leading dijet rapidity separation.

  • Table 2

    Data from Fig. 3b

    10.17182/hepdata.66091.v1/t2

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

  • Table 3

    Data from Fig. 4a

    10.17182/hepdata.66091.v1/t3

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

  • Table 4

    Data from Fig. 4b

    10.17182/hepdata.66091.v1/t4

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

  • Table 5

    Data from Fig. 5a

    10.17182/hepdata.66091.v1/t5

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

  • Table 6

    Data from Fig. 5b

    10.17182/hepdata.66091.v1/t6

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

  • Table 7

    Data from Fig. 5c

    10.17182/hepdata.66091.v1/t7

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

  • Table 8

    Data from Fig. 5d

    10.17182/hepdata.66091.v1/t8

    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

    10.17182/hepdata.66091.v1/t9

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

  • Table 10

    Data from Fig. 6b

    10.17182/hepdata.66091.v1/t10

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

  • Table 11

    Data from Fig. 6c

    10.17182/hepdata.66091.v1/t11

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

  • Table 12

    Data from Fig. 6d

    10.17182/hepdata.66091.v1/t12

    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

    10.17182/hepdata.66091.v1/t13

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

  • Table 14

    Data from Fig. 7

    10.17182/hepdata.66091.v1/t14

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

  • Table 15

    Data from Fig. 7

    10.17182/hepdata.66091.v1/t15

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

  • Table 16

    Data from Fig. 7

    10.17182/hepdata.66091.v1/t16

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

  • Table 17

    Data from Fig. 7

    10.17182/hepdata.66091.v1/t17

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

  • Table 18

    Data from Fig. 7

    10.17182/hepdata.66091.v1/t18

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

  • Table 19

    Data from Fig. 7

    10.17182/hepdata.66091.v1/t19

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

  • Table 20

    Data from Fig. 7

    10.17182/hepdata.66091.v1/t20

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

  • Table 21

    Data from Fig. 8

    10.17182/hepdata.66091.v1/t21

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

  • Table 22

    Data from Fig. 8

    10.17182/hepdata.66091.v1/t22

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

  • Table 23

    Data from Fig. 8

    10.17182/hepdata.66091.v1/t23

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

  • Table 24

    Data from Fig. 8

    10.17182/hepdata.66091.v1/t24

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

  • Table 25

    Data from Fig. 8

    10.17182/hepdata.66091.v1/t25

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

  • Table 26

    Data from Fig. 8

    10.17182/hepdata.66091.v1/t26

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

  • Table 27

    Data from Fig. 8

    10.17182/hepdata.66091.v1/t27

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

  • Table 28

    Data from Fig. 8

    10.17182/hepdata.66091.v1/t28

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

  • Table 29

    Data from Fig. 14

    10.17182/hepdata.66091.v1/t29

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

  • Table 30

    Data from Fig. 14

    10.17182/hepdata.66091.v1/t30

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

  • Table 31

    Data from Fig. 14

    10.17182/hepdata.66091.v1/t31

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

  • Table 32

    Data from Fig. 14

    10.17182/hepdata.66091.v1/t32

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

  • Table 33

    Data from Fig. 14

    10.17182/hepdata.66091.v1/t33

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

  • Table 34

    Data from Fig. 14

    10.17182/hepdata.66091.v1/t34

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

  • Table 35

    Data from Fig. 14

    10.17182/hepdata.66091.v1/t35

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

  • Table 36

    Data from Fig. 14

    10.17182/hepdata.66091.v1/t36

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

  • Table 37

    Data from Fig. 15a

    10.17182/hepdata.66091.v1/t37

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

  • Table 38

    Data from Fig. 15b

    10.17182/hepdata.66091.v1/t38

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

  • Table 39

    Data from Fig. 15c

    10.17182/hepdata.66091.v1/t39

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

  • Table 40

    Data from Fig. 15d

    10.17182/hepdata.66091.v1/t40

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

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