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Underlying Event properties in pp collisions at $\sqrt{s}$ = 13 TeV

The ALICE collaboration
JHEP 2004 (2020) 192, 2020.

Abstract (data abstract)
This article reports measurements characterizing the Underlying Event (UE) associated with hard scatterings at mid-rapidity ($|\\eta| <$ 0.8) in pp collisions at $\\sqrt{s} =$ 13 TeV. The hard scatterings are identified by the leading particle, the charged particle with the highest transverse momentum ($p_{T}^{leading}$) in the event. Charged-particle numbers and summed transverse-momentum densities are measured in different azimuthal regions defined with respect to the leading particle direction: Toward, Transverse, and Away. The Toward and Away regions contain the fragmentation products of the hard scatterings in addition to the UE contribution, whereas particles in the Transverse region are expected to originate predominantly from the UE. The study is performed as a function of $p_{T}^{leading}$ with three different $p_{T}$ thresholds for the associated particles, $p_{T}^{track} >$ 0.15, 0.5, and 1.0 GeV/$c$.

  • Number density and Sum p_T pT>0.15 GeV/c

    Figure 3

    10.17182/hepdata.94414.v1/t1

    Fig. 3: Number density $N_{ch}$ (left) and $\\Sigma p_{T}$ (right) distributions as a function of $p_{T}^{leading}$ in Toward, Transverse, and...

  • Probability distribution as function of R_T

    Figure 9

    10.17182/hepdata.94414.v1/t2

    Fig. 9: R_T probability distribution in the Transverse region for $p_{T}^{track} >$ 0.15 GeV/$c$ and $|\\eta|<$ 0.8. The result (solid...

  • Mean p_T as function of R_T

    Figure 10

    10.17182/hepdata.94414.v1/t3

    Fig. 10: $<p_{T}>$ in the Transverse region as a function of $R_{T}$ for $p_{T}^{track} >$ 0.15 GeV/$c$ and $|\\eta|<$ 0.8....

  • Number density and Sum p_T pT>0.5 GeV/c

    Figure A1

    10.17182/hepdata.94414.v1/t4

    Fig. A1: Number density $N_{ch}$ (left) and $\\Sigma p_{T}$ (right) distributions as a function of pleadingT and the comparisons to...

  • Number density and Sum p_T pT>1.0 GeV/c

    Figure A2

    10.17182/hepdata.94414.v1/t5

    Fig. A2: Number density $N_{ch}$ (left) and $\\Sigma p_{T}$ (right) distributions as a function of pleadingT and the comparisons to...

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