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Measurement of the underlying event activity in inclusive Z boson production in proton-proton collisions at $ \sqrt{s}=13 $ TeV

The CMS collaboration
JHEP 1807 (2018) 032, 2018

Abstract (data abstract)
Measurement of the underlying event activity, in proton-proton collisions at a centre-of-mass energy of 13 TeV, performed using inclusive Z-boson events collected by the CMS experiment at the Large Hadron Collider. The analyzed data corresponds to an integrated luminosity of 2.1 fb-1. The underlying event activity is quantified in terms of charged particle multiplicity and their scalar sum of their transverse momentum in different topological regions defined with respect to the resultatnt azimuthal direction of the two muons coming from the decay of a Z-boson. The distributions are unfolded to stable charged-particle level and are compared with predictions from various simulations, as well as with the measurements at a centre-of-mass energy of 1.96 TeV and 7 TeV by the CDF and CMS experiments. Events are selected online by requiring the presence of at least two isolated muon candidates with - $p_T > 17\,(8)$ GeV for the leading (subleading) muon - Offline, the leading and subleading muons are required to have a $p_T$ larger than 20 and 10 GeV, respectively - Events with two oppositely charged muons are further required to have an invariant mass ($M_{\mu\mu}$) in the window 81--101 GeV. - All charged particles, except selected muons, with $p_T > 0.5 GeV$ and $|\eta| < 2 $ are considered for the UE study. Particle density- The average number of charged particles in an event per unit $\Delta\eta\Delta\phi$ area. $\Sigma p_T$ density- The average of the scalar $p_T$ sum of all selected charged particles in an event per unit $\Delta\eta\Delta\phi$ area.

  • Table 1

    Data from Figure 1

    10.17182/hepdata.80167.v1/t1

    Unfolded distributions of particle density in Z events, as a function of $p_{T}^{\mu\mu}$ in the towards ($\Delta\phi< 60^{\circ}$) region. Error...

  • Table 2

    Data from Figure 1

    10.17182/hepdata.80167.v1/t2

    Unfolded distributions of particle density in Z events, as a function of $p_{T}^{\mu\mu}$ in the transverse ($60^{\circ} <\Delta\phi< 120^{\circ}$) region....

  • Table 3

    Data from Figure 1

    10.17182/hepdata.80167.v1/t3

    Unfolded distributions of particle density in Z events, as a function of $p_{T}^{\mu\mu}$ in the away ($\Delta\phi> 120^{\circ}$) region. Error...

  • Table 4

    Data from Figure 1

    10.17182/hepdata.80167.v1/t4

    Unfolded distributions of $\Sigma p_{T}$ density in Z events, as a function of $p_{T}^{\mu\mu}$ in the towards ($\Delta\phi< 60^{\circ}$) region....

  • Table 5

    Data from Figure 1

    10.17182/hepdata.80167.v1/t5

    Unfolded distributions of $\Sigma p_{T}$ density in Z events, as a function of $p_{T}^{\mu\mu}$ in the transverse ($60^{\circ} <\Delta\phi< 120^{\circ}$)...

  • Table 6

    Data from Figure 1

    10.17182/hepdata.80167.v1/t6

    Unfolded distributions of $\Sigma p_{T}$ density in Z events, as a function of $p_{T}^{\mu\mu}$ in the away ($\Delta\phi> 120^{\circ}$) region....

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