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Measurement of charged-particle distributions sensitive to the underlying event in $\sqrt{s} = 13$ TeV proton-proton collisions with the ATLAS detector at the LHC

The collaboration
No Journal Information, 2017

Abstract (data abstract)
We present charged-particle distributions sensitive to the underlying event, measured by the ATLAS detector in proton-proton collisions at a centre-of-mass energy of 13 TeV, in low-luminosity Large Hadron Collider fills corresponding to an integrated luminosity of 1.6 nb$^{-1}$. The distributions were constructed using charged particles with absolute pseudorapidity less than 2.5 and with transverse momentum greater than 500 MeV, in events with at least one such charged particle with transverse momentum above 1 GeV. These distributions characterise the angular distribution of energy and particle flows with respect to the charged particle with highest transverse momentum, as a function of both that momentum and of charged-particle multiplicity. The results have been corrected for detector effects and are compared to the predictions of various Monte Carlo event generators, experimentally establishing the level of underlying-event activity at LHC Run 2 energies and providing inputs for the development of event generator modelling. The current models in use for UE modelling typically describe this data to 5% accuracy, compared with data uncertainties of less than 1%.

• #### Table 1

Data from Figure 2

10.17182/hepdata.76730.v1/t1

Unit-normalised distribution of the transverse momentum of the leading charged-particle $p_\mathrm{T}^\mathrm{lead}$ > 1 GeV.

• #### Table 2

Data from Figure 5

10.17182/hepdata.76730.v1/t2

Mean values of charged-particle multiplicity $n_\mathrm{ch}$ as a function of leading charged-particle $p_\mathrm{T}$ in the trans-min azimuthal region.

• #### Table 3

Data from Figure 5

10.17182/hepdata.76730.v1/t3

Mean values of charged-particle multiplicity $n_\mathrm{ch}$ as a function of leading charged-particle $p_\mathrm{T}$ in the trans-max azimuthal region.

• #### Table 4

Data from Figure 5

10.17182/hepdata.76730.v1/t4

Mean values of charged-particle multiplicity $n_\mathrm{ch}$ as a function of leading charged-particle $p_\mathrm{T}$ in the trans-diff azimuthal region.

• #### Table 5

Data from Figure 5

10.17182/hepdata.76730.v1/t5

Mean values of charged-particle $\sum p_\mathrm{T}$ as a function of leading charged-particle $p_\mathrm{T}$ in the trans-min azimuthal region.

• #### Table 6

Data from Figure 5

10.17182/hepdata.76730.v1/t6

Mean values of charged-particle $\sum p_\mathrm{T}$ as a function of leading charged-particle $p_\mathrm{T}$ in the trans-max azimuthal region.

• #### Table 7

Data from Figure 5

10.17182/hepdata.76730.v1/t7

Mean values of charged-particle $\sum p_\mathrm{T}$ as a function of leading charged-particle $p_\mathrm{T}$ in the trans-diff azimuthal region.

• #### Table 8

Data from Figure 6

10.17182/hepdata.76730.v1/t8

Mean charged-particle average transverse momentum as a function of charged-particle multiplicity in transverse region for transverse azimuthal region.

• #### Table 9

Data from Figure 6

10.17182/hepdata.76730.v1/t9

Mean charged-particle average transverse momentum as a function of charged-particle multiplicity in transverse region for trans-min azimuthal region.

• #### Table 10

Data from Figure 6

10.17182/hepdata.76730.v1/t10

Mean charged-particle average transverse momentum as a function of charged-particle multiplicity in transverse region for trans-max azimuthal region.

• #### Table 11

Data from Figure 6

10.17182/hepdata.76730.v1/t11

Mean charged-particle average transverse momentum as a function of $p_\mathrm{T}^\mathrm{lead}$ for transverse azimuthal region.

• #### Table 12

Data from Figure 6

10.17182/hepdata.76730.v1/t12

Mean charged-particle average transverse momentum as a function of $p_\mathrm{T}^\mathrm{lead}$ for trans-min azimuthal region.

• #### Table 13

Data from Figure 6

10.17182/hepdata.76730.v1/t13

Mean charged-particle average transverse momentum as a function of $p_\mathrm{T}^\mathrm{lead}$ for trans-max azimuthal region.

• #### Table 14

Data from Figure 8

10.17182/hepdata.76730.v1/t14

• #### Table 31

Data from Figure 13

10.17182/hepdata.76730.v1/t31

Mean charged-particle average transverse momentum as a function of charged-particle multiplicity in trans-min region for trans-min azimuthal region.

• #### Table 32

Data from Figure 13

10.17182/hepdata.76730.v1/t32

Mean charged-particle average transverse momentum as a function of charged-particle multiplicity in trans-max region for trans-max azimuthal region.