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Measurement of the underlying event in jet events from 7 TeV proton-proton collisions with the ATLAS detector

The ATLAS collaboration
Eur.Phys.J. C74 (2014) 2965, 2014

Abstract (data abstract)
CERN-LHC. Distributions sensitive to the underlying event in QCD jet events have been measured with the ATLAS detector at the LHC, based on 37/pb of proton-proton collision data collected at a centre-of-mass energy of 7 TeV. Charged-particle mean pT and densities of all-particle ET and charged-particle multiplicity and pT have been measured in regions azimuthally transverse to the hardest jet in each event. These are presented both as one-dimensional distributions and with their mean values as functions of the leading-jet transverse momentum from 20 GeV to 800 GeV. The correlation of charged-particle mean pT with charged-particle multiplicity is also studied, and the ET densities include the forward rapidity region; these features provide extra data constraints for Monte Carlo modelling of colour reconnection and beam-remnant effects respectively. For the first time, underlying event observables have been computed separately for inclusive jet and exclusive dijet event selections, allowing more detailed study of the interplay of multiple partonic scattering and QCD radiation contributions to the underlying event. Comparisons to the predictions of different Monte Carlo models show a need for further model tuning, but the standard approach is found to generally reproduce the features of the underlying event in both types of event selection.

  • Table 1

    Data from Fig 3

    10.17182/hepdata.65229.v1/t1

    Transverse $\langle \sum p_T^\text{ch} / \delta\eta\,\delta\phi \rangle$ vs. $p_T^\text{lead}$ in $|\eta| < 2.5$ in incl jet / excl dijet events.

  • Table 2

    Data from AuxFig 2

    10.17182/hepdata.65229.v1/t2

    Trans-max $\langle \sum p_T^\text{ch} / \delta\eta\,\delta\phi \rangle$ vs. $p_T^\text{lead}$ in $|\eta| < 2.5$ in incl jet / excl dijet events.

  • Table 3

    Data from AuxFig 2

    10.17182/hepdata.65229.v1/t3

    Trans-min $\langle \sum p_T^\text{ch} / \delta\eta\,\delta\phi \rangle$ vs. $p_T^\text{lead}$ in $|\eta| < 2.5$ in incl jet / excl dijet events.

  • Table 4

    Data from Fig 4

    10.17182/hepdata.65229.v1/t4

    Transverse $\langle N_\text{ch} / \delta\eta\,\delta\phi \rangle$ vs. $p_T^\text{lead}$ in $|\eta| < 2.5$ in incl jet / excl dijet events.

  • Table 5

    Data from AuxFig 3

    10.17182/hepdata.65229.v1/t5

    Trans-max $\langle N_\text{ch} / \delta\eta\,\delta\phi \rangle$ vs. $p_T^\text{lead}$ in $|\eta| < 2.5$ in incl jet / excl dijet events.

  • Table 6

    Data from AuxFig 3

    10.17182/hepdata.65229.v1/t6

    Trans-min $\langle N_\text{ch} / \delta\eta\,\delta\phi \rangle$ vs. $p_T^\text{lead}$ in $|\eta| < 2.5$ in incl jet / excl dijet events.

  • Table 7

    Data from Fig 5

    10.17182/hepdata.65229.v1/t7

    Transverse $\langle \sum E_T^\text{ch+neut} / \delta\eta\,\delta\phi \rangle$ vs. $p_T^\text{lead}$ in $|\eta| < 2.5$ in incl jet / excl dijet events.

  • Table 8

    Data from Fig 5

    10.17182/hepdata.65229.v1/t8

    Transverse $\langle \sum E_T^\text{ch+neut} / \delta\eta\,\delta\phi \rangle$ vs. $p_T^\text{lead}$ in $|\eta| < 4.8$ in incl jet / excl dijet events.

  • Table 9

    Data from Fig 5

    10.17182/hepdata.65229.v1/t9

    Transverse $\langle \sum p_T^\text{ch} / \sum E_T^\text{ch+neut} \rangle$ vs. $p_T^\text{lead}$ in $|\eta| < 2.5$ in incl jet / excl dijet...

  • Table 10

    Data from Fig 6

    10.17182/hepdata.65229.v1/t10

    Transverse $\langle \text{mean}~p_T^\text{ch} \rangle$ vs. $p_T^\text{lead}$ in $|\eta| < 2.5$ in incl jet / excl dijet events.

  • Table 11

    Data from Fig 6

    10.17182/hepdata.65229.v1/t11

    Transverse $\langle \text{mean}~p_T^\text{ch} \rangle$ vs. $N_\text{ch}$ in $|\eta| < 2.5$ in incl jet events.

  • Table 12

    Data from Fig 6

    10.17182/hepdata.65229.v1/t12

    Transverse $\langle \text{mean}~p_T^\text{ch} \rangle$ vs. $N_\text{ch}$ in $|\eta| < 2.5$ in excl dijet events.

  • Table 13

    Data from AuxFig 4

    10.17182/hepdata.65229.v1/t13

    Transverse $\sum p_T^\text{ch}$ in $|\eta| < 2.5$, $p_T^\text{lead} > 20\;\text{GeV}$ in incl jet / excl dijet events.

  • Table 14

    Data from AuxFig 4

    10.17182/hepdata.65229.v1/t14

    Trans-max $\sum p_T^\text{ch}$ in $|\eta| < 2.5$, $p_T^\text{lead} > 20\;\text{GeV}$ in incl jet / excl dijet events.

  • Table 15

    Data from AuxFig 4

    10.17182/hepdata.65229.v1/t15

    Trans-min $\sum p_T^\text{ch}$ in $|\eta| < 2.5$, $p_T^\text{lead} > 20\;\text{GeV}$ in incl jet / excl dijet events.

  • Table 16

    Data from AuxFig 6

    10.17182/hepdata.65229.v1/t16

    Transverse $\sum p_T^\text{ch}$ in $|\eta| < 2.5$, $p_T^\text{lead} \in [20, 60]\;\text{GeV}$ in incl jet / excl dijet events.

  • Table 17

    Data from AuxFig 6

    10.17182/hepdata.65229.v1/t17

    Trans-max $\sum p_T^\text{ch}$ in $|\eta| < 2.5$, $p_T^\text{lead} \in [20, 60]\;\text{GeV}$ in incl jet / excl dijet events.

  • Table 18

    Data from AuxFig 6

    10.17182/hepdata.65229.v1/t18

    Trans-min $\sum p_T^\text{ch}$ in $|\eta| < 2.5$, $p_T^\text{lead} \in [20, 60]\;\text{GeV}$ in incl jet / excl dijet events.

  • Table 19

    Data from AuxFig 8

    10.17182/hepdata.65229.v1/t19

    Transverse $\sum p_T^\text{ch}$ in $|\eta| < 2.5$, $p_T^\text{lead} \in [60,210]\;\text{GeV}$ in incl jet / excl dijet events.

  • Table 20

    Data from AuxFig 8

    10.17182/hepdata.65229.v1/t20

    Trans-max $\sum p_T^\text{ch}$ in $|\eta| < 2.5$, $p_T^\text{lead} \in [60,210]\;\text{GeV}$ in incl jet / excl dijet events.

  • Table 21

    Data from AuxFig 8

    10.17182/hepdata.65229.v1/t21

    Trans-min $\sum p_T^\text{ch}$ in $|\eta| < 2.5$, $p_T^\text{lead} \in [60,210]\;\text{GeV}$ in incl jet / excl dijet events.

  • Table 22

    Data from AuxFig 10

    10.17182/hepdata.65229.v1/t22

    Transverse $\sum p_T^\text{ch}$ in $|\eta| < 2.5$, $p_T^\text{lead} > 210\;\text{GeV}$ in incl jet / excl dijet events.

  • Table 23

    Data from AuxFig 10

    10.17182/hepdata.65229.v1/t23

    Trans-max $\sum p_T^\text{ch}$ in $|\eta| < 2.5$, $p_T^\text{lead} > 210\;\text{GeV}$ in incl jet / excl dijet events.

  • Table 24

    Data from AuxFig 10

    10.17182/hepdata.65229.v1/t24

    Trans-min $\sum p_T^\text{ch}$ in $|\eta| < 2.5$, $p_T^\text{lead} > 210\;\text{GeV}$ in incl jet / excl dijet events.

  • Table 25

    Data from AuxFig 5

    10.17182/hepdata.65229.v1/t25

    Transverse $N_\text{ch}$ in $|\eta| < 2.5$, $p_T^\text{lead} > 20\;\text{GeV}$ in incl jet / excl dijet events.

  • Table 26

    Data from AuxFig 5

    10.17182/hepdata.65229.v1/t26

    Trans-max $N_\text{ch}$ in $|\eta| < 2.5$, $p_T^\text{lead} > 20\;\text{GeV}$ in incl jet / excl dijet events.

  • Table 27

    Data from AuxFig 5

    10.17182/hepdata.65229.v1/t27

    Trans-min $N_\text{ch}$ in $|\eta| < 2.5$, $p_T^\text{lead} > 20\;\text{GeV}$ in incl jet / excl dijet events.

  • Table 28

    Data from AuxFig 7

    10.17182/hepdata.65229.v1/t28

    Transverse $N_\text{ch}$ in $|\eta| < 2.5$, $p_T^\text{lead} \in [20, 60]\;\text{GeV}$ in incl jet / excl dijet events.

  • Table 29

    Data from AuxFig 7

    10.17182/hepdata.65229.v1/t29

    Trans-max $N_\text{ch}$ in $|\eta| < 2.5$, $p_T^\text{lead} \in [20, 60]\;\text{GeV}$ in incl jet / excl dijet events.

  • Table 30

    Data from AuxFig 7

    10.17182/hepdata.65229.v1/t30

    Trans-min $N_\text{ch}$ in $|\eta| < 2.5$, $p_T^\text{lead} \in [20, 60]\;\text{GeV}$ in incl jet / excl dijet events.

  • Table 31

    Data from AuxFig 9

    10.17182/hepdata.65229.v1/t31

    Transverse $N_\text{ch}$ in $|\eta| < 2.5$, $p_T^\text{lead} \in [60,210]\;\text{GeV}$ in incl jet / excl dijet events.

  • Table 32

    Data from AuxFig 9

    10.17182/hepdata.65229.v1/t32

    Trans-max $N_\text{ch}$ in $|\eta| < 2.5$, $p_T^\text{lead} \in [60,210]\;\text{GeV}$ in incl jet / excl dijet events.

  • Table 33

    Data from AuxFig 9

    10.17182/hepdata.65229.v1/t33

    Trans-min $N_\text{ch}$ in $|\eta| < 2.5$, $p_T^\text{lead} \in [60,210]\;\text{GeV}$ in incl jet / excl dijet events.

  • Table 34

    Data from AuxFig 11

    10.17182/hepdata.65229.v1/t34

    Transverse $N_\text{ch}$ in $|\eta| < 2.5$, $p_T^\text{lead} > 210\;\text{GeV}$ in incl jet / excl dijet events.

  • Table 35

    Data from AuxFig 11

    10.17182/hepdata.65229.v1/t35

    Trans-max $N_\text{ch}$ in $|\eta| < 2.5$, $p_T^\text{lead} > 210\;\text{GeV}$ in incl jet / excl dijet events.

  • Table 36

    Data from AuxFig 11

    10.17182/hepdata.65229.v1/t36

    Trans-min $N_\text{ch}$ in $|\eta| < 2.5$, $p_T^\text{lead} > 210\;\text{GeV}$ in incl jet / excl dijet events.

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