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Measurement of the Splitting Function in $pp$ and Pb-Pb Collisions at $\sqrt{s_{_{\mathrm{NN}}}} =$ 5.02 TeV

The CMS collaboration
Phys.Rev.Lett. 120 (2018) 142302, 2018.

Abstract
Data from heavy ion collisions suggest that the evolution of a parton shower is modified by interactions with the color charges in the dense partonic medium created in these collisions, but it is not known where in the shower evolution the modifications occur. The momentum ratio of the two leading partons, resolved as subjets, provides information about the parton shower evolution. This substructure observable, known as the splitting function, reflects the process of a parton splitting into two other partons and has been measured for jets with transverse momentum between 140 and 500 GeV, in pp and PbPb collisions at a center-of-mass energy of 5.02 GeV per nucleon pair. In central PbPb collisions, the splitting function indicates a more unbalanced momentum ratio, compared to peripheral PbPb and pp collisions. The measurements are compared to various predictions from event generators and analytical calculations.

  • Table 1

    Data from Figure 1. Page 3 of preprint

    10.17182/hepdata.79666.v1/t1

    Groomed jet energy fraction in pp and PbPb collisions for jets with PTJET 160-180 GeV.

  • Table 2

    Data from Figure 2. Page 4 of preprint

    10.17182/hepdata.79666.v1/t2

    Self-normalized zg distribution in pp collisions for jets with PTJET 160-180 GeV.

  • Table 3

    Data from Figure 3a. Page 5 of preprint

    10.17182/hepdata.79666.v1/t3

    Self-normalized zg distributions in PbPb and smeared pp collisions in the 50-80 centrality event class for jets with PTJET 160-180...

  • Table 4

    Data from Figure 3b. Page 5 of preprint

    10.17182/hepdata.79666.v1/t4

    Self-normalized zg distributions in PbPb and smeared pp collisions in the 30-50 centrality event class for jets with PTJET 160-180...

  • Table 5

    Data from Figure 3c. Page 5 of preprint

    10.17182/hepdata.79666.v1/t5

    Self-normalized zg distributions in PbPb and smeared pp collisions in the 10-30 centrality event class for jets with PTJET 160-180...

  • Table 6

    Data from Figure 3d. Page 5 of preprint

    10.17182/hepdata.79666.v1/t6

    Self-normalized zg distributions in PbPb and smeared pp collisions in the 0-10 centrality event class for jets with PTJET 160-180...

  • Table 7

    Data from Figure 3e. Page 5 of preprint

    10.17182/hepdata.79666.v1/t7

    Ratio of zg distributions in PbPb and smeared pp collisions in the 50-80 centrality event class for jets with PTJET...

  • Table 8

    Data from Figure 3f. Page 5 of preprint

    10.17182/hepdata.79666.v1/t8

    Ratio of zg distributions in PbPb and smeared pp collisions in the 30-50 centrality event class for jets with PTJET...

  • Table 9

    Data from Figure 3g. Page 5 of preprint

    10.17182/hepdata.79666.v1/t9

    Ratio of zg distributions in PbPb and smeared pp collisions in the 10-30 centrality event class for jets with PTJET...

  • Table 10

    Data from Figure 3h. Page 5 of preprint

    10.17182/hepdata.79666.v1/t10

    Ratio of zg distributions in PbPb and smeared pp collisions in the 0-10 centrality event class for jets with PTJET...

  • Table 11

    Data from Figure 4a. Page 6 of preprint

    10.17182/hepdata.79666.v1/t11

    Ratio of zg distributions in PbPb and smeared pp collisions in the 10% most central events for jets with PTJET...

  • Table 12

    Data from Figure 4b. Page 6 of preprint

    10.17182/hepdata.79666.v1/t12

    Ratio of zg distributions in PbPb and smeared pp collisions in the 10% most central events for jets with PTJET...

  • Table 13

    Data from Figure 4c. Page 6 of preprint

    10.17182/hepdata.79666.v1/t13

    Ratio of zg distributions in PbPb and smeared pp collisions in the 10% most central events for jets with PTJET...

  • Table 14

    Data from Figure 4d. Page 6 of preprint

    10.17182/hepdata.79666.v1/t14

    Ratio of zg distributions in PbPb and smeared pp collisions in the 10% most central events for jets with PTJET...

  • Table 15

    Data from Figure 4e. Page 6 of preprint

    10.17182/hepdata.79666.v1/t15

    Ratio of zg distributions in PbPb and smeared pp collisions in the 10% most central events for jets with PTJET...

  • Table 16

    Data from Figure 4f. Page 6 of preprint

    10.17182/hepdata.79666.v1/t16

    Ratio of zg distributions in PbPb and smeared pp collisions in the 10% most central events for jets with PTJET...

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