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Measurement of the underlying event activity using charged-particle jets in proton-proton collisions at sqrt(s) = 2.76 TeV

The CMS collaboration
JHEP 1509 (2015) 137, 2015

Abstract (data abstract)
CERN-LHC. A measurement of the underlying event (UE) activity in proton-proton collisions is performed using events with charged-particle jets produced in the central pseudorapidity region (|eta_jet| < 2) and with transverse momentum 1 <p_T,jet< 100 GeV. The analysis uses a data sample collected at a centre-of-mass energy of 2.76 TeV with the CMS experiment at the LHC. The UE activity is measured as a function of p_T,jet in terms of the average multiplicity and scalar sum of transverse momenta (pT) of charged particles, with |eta|<2 and pT>0.5 GeV, in the azimuthal region transverse to the highest pT jet direction. By further dividing the transverse region into two regions of smaller and larger activity, various components of the UE activity are separated. The measurements are compared to previous results at 0.9 and 7 TeV, and to predictions of several Monte Carlo event generators, providing constraints on the modelling of the UE dynamics.

  • Table 1

    Data from Fig. 1-left

    10.17182/hepdata.69365.v1/t1

    Fully corrected average charged particle multiplicity per unit of pseudorapidity and per radian as a function of the leading track-jet...

  • Table 2

    Data from Fig. 1-right

    10.17182/hepdata.69365.v1/t2

    Fully corrected average charged particle scalar Sum(pT) per unit of pseudorapidity and per radian as a function of the leading...

  • Table 3

    Data from Fig. 2-top-left

    10.17182/hepdata.69365.v1/t3

    Fully corrected average charged particle multiplicity per unit of pseudorapidity and per radian as a function of the leading track-jet...

  • Table 4

    Data from Fig. 2-top-right

    10.17182/hepdata.69365.v1/t4

    Fully corrected average charged particle scalar Sum(pT) per unit of pseudorapidity and per radian as a function of the leading...

  • Table 5

    Data from Fig. 2-bottom-left

    10.17182/hepdata.69365.v1/t5

    Fully corrected average charged particle multiplicity per unit of pseudorapidity and per radian as a function of the leading track-jet...

  • Table 6

    Data from Fig. 2-bottom-right

    10.17182/hepdata.69365.v1/t6

    Fully corrected average charged particle scalar Sum(pT) per unit of pseudorapidity and per radian as a function of the leading...

  • Table 7

    Data from Fig. 3-left

    10.17182/hepdata.69365.v1/t7

    Fully corrected average charged particle multiplicity per unit of pseudorapidity and per radian as a function of the leading track-jet...

  • Table 8

    Data from Fig 3-right

    10.17182/hepdata.69365.v1/t8

    Fully corrected average charged particle scalar Sum(pT) per unit of pseudorapidity and per radian as a function of the leading...

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