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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 ATLAS 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

    Unit-normalised distribution of the transverse momentum of the leading charged-particle $p_\mathrm{T}^\mathrm{lead}\ \mathrm{[GeV]}$ > 5 GeV$.

  • Table 15

    Data from Figure 10

    10.17182/hepdata.76730.v1/t15

    Mean charged-particle multiplicity $n_\mathrm{ch}$ density as a function of $\Delta\phi_\mathrm{lead}$ for $p_\mathrm{T}^\mathrm{lead}$ > 1 GeV.

  • Table 16

    Data from Figure 10

    10.17182/hepdata.76730.v1/t16

    Mean charged-particle multiplicity $n_\mathrm{ch}$ density as a function of $\Delta\phi_\mathrm{lead}$ for $p_\mathrm{T}^\mathrm{lead}$ > 5 GeV.

  • Table 17

    Data from Figure 10

    10.17182/hepdata.76730.v1/t17

    Mean charged-particle multiplicity $n_\mathrm{ch}$ density as a function of $\Delta\phi_\mathrm{lead}$ for $p_\mathrm{T}^\mathrm{lead}$ > 10 GeV.

  • Table 18

    Data from Figure 10

    10.17182/hepdata.76730.v1/t18

    Mean charged-particle $\sum p_\mathrm{T}$ density as a function of $\Delta\phi_\mathrm{lead}$ for $p_\mathrm{T}^\mathrm{lead}$ >1 GeV.

  • Table 19

    Data from Figure 10

    10.17182/hepdata.76730.v1/t19

    Mean charged-particle $\sum p_\mathrm{T}$ density as a function of $\Delta\phi_\mathrm{lead}$ for $p_\mathrm{T}^\mathrm{lead}$ > 5 GeV.

  • Table 20

    Data from Figure 10

    10.17182/hepdata.76730.v1/t20

    Mean charged-particle $\sum p_\mathrm{T}$ density as a function of $\Delta\phi_\mathrm{lead}$ for $p_\mathrm{T}^\mathrm{lead}$ > 10 GeV.

  • Table 21

    Data from Figure 11

    10.17182/hepdata.76730.v1/t21

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

  • Table 22

    Data from Figure 11

    10.17182/hepdata.76730.v1/t22

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

  • Table 23

    Data from Figure 11

    10.17182/hepdata.76730.v1/t23

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

  • Table 24

    Data from Figure 11

    10.17182/hepdata.76730.v1/t24

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

  • Table 25

    Data from Figure 11

    10.17182/hepdata.76730.v1/t25

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

  • Table 26

    Data from Figure 11

    10.17182/hepdata.76730.v1/t26

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

  • Table 27

    Data from Figure 12

    10.17182/hepdata.76730.v1/t27

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

  • Table 28

    Data from Figure 12

    10.17182/hepdata.76730.v1/t28

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

  • Table 29

    Data from Figure 12

    10.17182/hepdata.76730.v1/t29

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

  • Table 30

    Data from Figure 12

    10.17182/hepdata.76730.v1/t30

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

  • 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.

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