Jet Shapes of Isolated Photon-Tagged Jets in Pb-Pb and pp Collisions at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV

The collaboration
Phys.Rev.Lett. 122 (2019) 152001, 2019.

Abstract
The modification of jet shapes in PbPb collisions, relative to those in pp collisions, is studied for jets associated with an isolated photon. The data were collected with the CMS detector at the LHC at a nucleon-nucleon center-of-mass energy of 5.02 TeV. Jet shapes are constructed from charged particles with track transverse momenta ($p_\mathrm{T}$) above 1 GeV/c in annuli around the axes of jets with $p^\mathrm{jet}_\mathrm{T}$ $>$ 30 GeV/c associated with an isolated photon with $p^\gamma_\mathrm{T}$ $>$ 60 GeV/c. The jet shape distributions are consistent between peripheral PbPb and pp collisions, but are modified for more central PbPb collisions. In these central PbPb events, a larger fraction of the jet momentum is observed at larger distances from the jet axis compared to pp, reflecting the interaction between the partonic medium created in heavy ion collisions and the traversing partons.

• Table 1

Data from top panel of Fig. 1

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The differential jet shape, $\rho(r)$, for jets associated with an isolated photon in pp collisions.

• Table 2

Data from top panel of Fig. 1

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The differential jet shape, $\rho(r)$, for jets associated with an isolated photon in 50-100% centrality PbPb collisions.

• Table 3

Data from top panel of Fig. 1

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The differential jet shape, $\rho(r)$, for jets associated with an isolated photon in 30-50% centrality PbPb collisions.

• Table 4

Data from top panel of Fig. 1

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The differential jet shape, $\rho(r)$, for jets associated with an isolated photon in 10-30% centrality PbPb collisions.

• Table 5

Data from top panel of Fig. 1

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The differential jet shape, $\rho(r)$, for jets associated with an isolated photon in 0-10% centrality PbPb collisions.

• Table 6

Data from bottom panel of Fig. 1

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PbPb / pp ratio of $\rho(r)$ for 50-100% centrality PbPb collisions.

• Table 7

Data from bottom panel of Fig. 1

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PbPb / pp ratio of $\rho(r)$ for 30-50% centrality PbPb collisions.

• Table 8

Data from bottom panel of Fig. 1

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PbPb / pp ratio of $\rho(r)$ for 10-30% centrality PbPb collisions.

• Table 9

Data from bottom panel of Fig. 1

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PbPb / pp ratio of $\rho(r)$ for 0-10% centrality PbPb collisions.