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Study of the energy dependence of the underlying event in proton-antiproton collisions

The CDF collaboration
Phys.Rev. D92 (2015) 092009, 2015

Abstract (data abstract)
FERMILAB-TEVATRON. We study charged particle production (pT> 0.5 GeV/c, |eta| < 0.8) in proton-antiproton collisions at 300 GeV, 900 GeV, and 1.96 TeV. We use the direction of the charged particle with the largest transverse momentum in each event to define three regions of eta-phi space; "toward", "away", and "transverse". The average number and the average scalar pT sum of charged particles in the transverse region are sensitive to the modeling of the "underlying event". The transverse region is divided into a MAX and MIN transverse region, which helps separate the "hard component" (initial and final-state radiation) from the "beam-beam remnant" and multiple parton interaction components of the scattering. The center-of-mass energy dependence of the various components of the event are studied in detail. The data presented here can be used to constrain and improve QCD Monte Carlo models, resulting in more precise predictions at the LHC energies of 13 and 14 TeV. The fiducial region is defined as: - at least a charged particle in |eta|<0.8 with pT > 0.5 GeV. - Charged particles are counted in |eta|<0.8 with pT > 0.5 GeV.

  • Table 1

    Data from Figure 10(A,B)

    10.17182/hepdata.70787.v1/t1

    Average charged particle multiplicity for charged particles with pT > 0.5 GeV and |eta| < 0.8 in the TransMAX region...

  • Table 2

    Data from Figure 10(C,D)

    10.17182/hepdata.70787.v1/t2

    Average charged particle multiplicity for charged particles with pT > 0.5 GeV and |eta| < 0.8 in the TransMIN region...

  • Table 3

    Data from Figure 12(A,B)

    10.17182/hepdata.70787.v1/t3

    Average charged particle multiplicity for charged particles with pT > 0.5 GeV and |eta| < 0.8 in the TransAVE region...

  • Table 4

    Data from Figure 12(C,D)

    10.17182/hepdata.70787.v1/t4

    Average charged particle multiplicity for charged particles with pT > 0.5 GeV and |eta| < 0.8 in the TransDIF region...

  • Table 5

    Data from Figure 11(A,B)

    10.17182/hepdata.70787.v1/t5

    Average charged particle pT sum for charged particles with pT > 0.5 GeV and |eta| < 0.8 in the TransMAX...

  • Table 6

    Data from Figure 11(C,D)

    10.17182/hepdata.70787.v1/t6

    Average charged particle pT sum for charged particles with pT > 0.5 GeV and |eta| < 0.8 in the TransMIN...

  • Table 7

    Data from Figure 13(A,B)

    10.17182/hepdata.70787.v1/t7

    Average charged particle pT sum for charged particles with pT > 0.5 GeV and |eta| < 0.8 in the TransAVE...

  • Table 8

    Data from Figure 13(C,D)

    10.17182/hepdata.70787.v1/t8

    Average charged particle pT sum for charged particles with pT > 0.5 GeV and |eta| < 0.8 in the TransDIF...

  • Table 9

    Data from Figure 10(A,B)

    10.17182/hepdata.70787.v1/t9

    Average charged particle multiplicity for charged particles with pT > 0.5 GeV and |eta| < 0.8 in the TransMAX region...

  • Table 10

    Data from Figure 10(C,D)

    10.17182/hepdata.70787.v1/t10

    Average charged particle multiplicity for charged particles with pT > 0.5 GeV and |eta| < 0.8 in the TransMIN region...

  • Table 11

    Data from Figure 12(A,B)

    10.17182/hepdata.70787.v1/t11

    Average charged particle multiplicity for charged particles with pT > 0.5 GeV and |eta| < 0.8 in the TransAVE region...

  • Table 12

    Data from Figure 12(C,D)

    10.17182/hepdata.70787.v1/t12

    Average charged particle multiplicity for charged particles with pT > 0.5 GeV and |eta| < 0.8 in the TransDIF region...

  • Table 13

    Data from Figure 11(A,B)

    10.17182/hepdata.70787.v1/t13

    Average charged particle pT sum for charged particles with pT > 0.5 GeV and |eta| < 0.8 in the TransMAX...

  • Table 14

    Data from Figure 11(C,D)

    10.17182/hepdata.70787.v1/t14

    Average charged particle pT sum for charged particles with pT > 0.5 GeV and |eta| < 0.8 in the TransMIN...

  • Table 15

    Data from Figure 13(A,B)

    10.17182/hepdata.70787.v1/t15

    Average charged particle pT sum for charged particles with pT > 0.5 GeV and |eta| < 0.8 in the TransAVE...

  • Table 16

    Data from Figure 13(C,D)

    10.17182/hepdata.70787.v1/t16

    Average charged particle pT sum for charged particles with pT > 0.5 GeV and |eta| < 0.8 in the TransDIF...

  • Table 17

    Data from Figure 10(A,B)

    10.17182/hepdata.70787.v1/t17

    Average charged particle multiplicity for charged particles with pT > 0.5 GeV and |eta| < 0.8 in the TransMAX region...

  • Table 18

    Data from Figure 10(C,D)

    10.17182/hepdata.70787.v1/t18

    Average charged particle multiplicity for charged particles with pT > 0.5 GeV and |eta| < 0.8 in the TransMIN region...

  • Table 19

    Data from Figure 12(A,B)

    10.17182/hepdata.70787.v1/t19

    Average charged particle multiplicity for charged particles with pT > 0.5 GeV and |eta| < 0.8 in the TransAVE region...

  • Table 20

    Data from Figure 12(C,D)

    10.17182/hepdata.70787.v1/t20

    Average charged particle multiplicity for charged particles with pT > 0.5 GeV and |eta| < 0.8 in the TransDIF region...

  • Table 21

    Data from Figure 11(A,B)

    10.17182/hepdata.70787.v1/t21

    Average charged particle pT sum for charged particles with pT > 0.5 GeV and |eta| < 0.8 in the TransMAX...

  • Table 22

    Data from Figure 11(C,D)

    10.17182/hepdata.70787.v1/t22

    Average charged particle pT sum for charged particles with pT > 0.5 GeV and |eta| < 0.8 in the TransMIN...

  • Table 23

    Data from Figure 13(A,B)

    10.17182/hepdata.70787.v1/t23

    Average charged particle pT sum for charged particles with pT > 0.5 GeV and |eta| < 0.8 in the TransAVE...

  • Table 24

    Data from Figure 13(C,D)

    10.17182/hepdata.70787.v1/t24

    Average charged particle pT sum for charged particles with pT > 0.5 GeV and |eta| < 0.8 in the TransDIF...

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