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Multiplicity dependence of jet-like two-particle correlation structures in p–Pb collisions at $\sqrt{s_{NN}}$=5.02 TeV

The ALICE collaboration
Phys.Lett. B741 (2015) 38-50, 2015

Abstract (data abstract)
CERN-LHC. Two-particle angular correlations between unidentified charged trigger and associated particles are measured by the ALICE detector in p-Pb collisions at a nucleon-nucleon centre-of-mass energy of 5.02 TeV. The transverse-momentum range 0.7 < p_{T, assoc} < p_{T, trig} < 5.0 GeV is examined, to include correlations induced by jets originating from low momentum-transfer scatterings (minijets). The correlations expressed as associated yield per trigger particle are obtained in the pseudorapidity range |eta|<0.9. The near-side long-range pseudorapidity correlations observed in high-multiplicity p-Pb collisions are subtracted from both near-side short-range and away-side correlations in order to remove the non-jet-like components. The yields in the jet-like peaks are found to be invariant with event multiplicity with the exception of events with low multiplicity. This invariance is consistent with the particles being produced via the incoherent fragmentation of multiple parton--parton scatterings, while the yield related to the previously observed ridge structures is not jet-related. The number of uncorrelated sources of particle production is found to increase linearly with multiplicity, suggesting no saturation of the number of multi-parton interactions even in the highest multiplicity p-Pb collisions. Further, the number scales in the intermediate multiplicity region with the number of binary nucleon-nucleon collisions estimated with a Glauber Monte-Carlo simulation.

  • Table 1

    Data from Figure 2A

    10.17182/hepdata.64972.v1/t1

    near-side per-trigger yield vs V0A multiplicity.

  • Table 2

    Data from Figure 2B

    10.17182/hepdata.64972.v1/t2

    away-side per-trigger yield vs V0A multiplicity.

  • Table 3

    Data from Figure 3A and 3B - red curve

    10.17182/hepdata.64972.v1/t3

    V0A per-trigger yield vs midrapidity charged-particle multiplicity.

  • Table 4

    Data from Figure 3A and 3B - blue curve

    10.17182/hepdata.64972.v1/t4

    CL1 per-trigger yield vs midrapidity charged-particle multiplicity.

  • Table 5

    Data from Figure 3A and 3B - black curve

    10.17182/hepdata.64972.v1/t5

    ZNA per-trigger yield vs midrapidity charged-particle multiplicity.

  • Table 6

    Data from Figure 4A

    10.17182/hepdata.64972.v1/t6

    near-side per-trigger yield vs V0A multiplicity with and without long-range correlations subtraction.

  • Table 7

    Data from Figure 4B

    10.17182/hepdata.64972.v1/t7

    away-side per-trigger yield vs V0A multiplicity with and without long-range correlations subtraction.

  • Table 8

    Data from Figure 5

    10.17182/hepdata.64972.v1/t8

    number of uncorrelated seeds vs midrapidity V0A multiplicity.

  • Table 9

    Data from Figure 6

    10.17182/hepdata.64972.v1/t9

    ratio between number of uncorrelated seeds and Glauber Ncoll vs V0A multiplicity classes.

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