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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