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First Measurement of the Underlying Event Activity at the LHC with $\sqrt{s} = 0.9$ TeV

The CMS collaboration
Eur.Phys.J. C70 (2010) 555-572, 2010

Abstract (data abstract)
CERN-LHC, Measurement of the properties of the underlying event activity for charged hadron production in proton-proton collisions at a centre-of-mass energy of 900 GeV. The charged hadrons are required to have PT > 0.5 GeV and pseudorapidity in the range -2 to 2 with the presence of a hard scale provided by the PT of the leading charged particle or of the leading track-jet to be at least 1 to 3 GeV. By requiring the azimuthal angle difference (DELTA(PHI)) between the direction, in the plane transverse to the beams, of the leading object and that of the charged hadron to be between 60 and 120 GeV, the transvese region is selected. Numerical values supplied by R Field.

  • Table 1

    Data from F 1

    10.17182/hepdata.55126.v1/t1

    Average multiplicity of charged particles per unit of pseudorapidity as a function of pseudorapidity for events with leading track-jet transverse...

  • Table 2

    Data from F 2

    10.17182/hepdata.55126.v1/t2

    Average scalar sum of the transverse momenta of charged particles per unit of pseusdorapidity and per radian as a function...

  • Table 3

    Data from F 3

    10.17182/hepdata.55126.v1/t3

    The average multiplicity and average scalar sum of transverse momenta of charge particles per unit of pseudorapidity and per radian...

  • Table 4

    Data from F 3

    10.17182/hepdata.55126.v1/t4

    The average multiplicity and average scalar sum of transverse momenta of charge particles per unit of pseudorapidity and per radian...

  • Table 5

    Data from F 4

    10.17182/hepdata.55126.v1/t5

    The normalized multiplicity distribution (PROB) of charged particles. Statistical error only. Typical systematic error of 2.3 PCT at a multiplicity...

  • Table 6

    Data from F 4

    10.17182/hepdata.55126.v1/t6

    The normalized distribution of the scalar sum of the transverse momenta of charged particles. Statistical errors only. Typical systematic error...

  • Table 7

    Data from F 4

    10.17182/hepdata.55126.v1/t7

    The transverse momenta spectrum of charged particles. Statistical error only. Typical systematic error of 2.0 PCT at a PT of...

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