Name: Observation of medium-induced yield enhancement and acoplanarity broadening of low-$p_\mathrm{T}$ jets from measurements in pp and central Pb$-$Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV
Creator: ALICE Collaboration
Published: 2024

Abstract (data abstract)

The ALICE Collaboration reports measurements of the semi-inclusive distribution of charged-particle jets recoiling from a high transverse momentum (high

p_{T}

) charged hadron, in pp and central Pb--Pb collisions at center of mass energy per nucleon--nucleon collision

\sqrt{s_{NN}} = 5.02

TeV. The large uncorrelated background in central Pb--Pb collisions is corrected using a data-driven statistical approach, which enables precise measurement of recoil jet distributions over a broad range in

p_{T, ch jet}

and jet resolution parameter

R

. Recoil jet yields are reported for

R =

0.2, 0.4, and 0.5 in the range

7 < p_{T, ch jet} < 140

GeV/

c

and

π / 2 < Δ φ < π

, where

Δ φ

is the azimuthal angular separation between hadron trigger and recoil jet. The low

p_{T, ch jet}

reach of the measurement explores unique phase space for studying jet quenching, the interaction of jets with the quark--gluon plasma generated in high-energy nuclear collisions. Comparison of

p_{T, ch jet}

distributions from pp and central Pb--Pb collisions probes medium-induced jet energy loss and intra-jet broadening, while comparison of their acoplanarity distributions explores in-medium jet scattering and medium response. The measurements are compared to theoretical calculations incorporating jet quenching.

Table 1

Data from Figure 11 of preprint arxiv:2308.16128, Figure 1 (top panels) of preprint arxiv:2308.16131

10.17182/hepdata.152376.v1/t1

Corrected $Δ_{recoil} (p_{T, ch jet})$ distributions measured for $R =$ 0.2, 0.4, and 0.5 in pp collisions at $\sqrt{s} = 5.02$ TeV.
Table 2

Data from Figure 13 of preprint arxiv:2308.16128, Figure 1 (top panels) of preprint arxiv:2308.16131

10.17182/hepdata.152376.v1/t2

Corrected $Δ_{recoil} (p_{T, ch jet})$ distributions measured for $R =$ 0.2, 0.4, and 0.5 in Pb--Pb collisions at $\sqrt{s} = 5.02$ TeV.
Table 3

Data from Figure 15 of preprint arxiv:2308.16128, Figure 1 (bottom panels) of preprint arxiv:2308.16131

10.17182/hepdata.152376.v1/t3

$I_{AA} (p_{T, ch jet})$ measured for $R =$ 0.2, 0.4, and 0.5 in Pb--Pb collisions at $\sqrt{s} = 5.02$ TeV.
Table 4

Data from Figure 12 (top) of preprint arxiv:2308.16128

10.17182/hepdata.152376.v1/t4

Corrected $Δ_{recoil} (Δ φ)$ distributions measured for $R =$ 0.2 in pp collisions at $\sqrt{s} = 5.02$ TeV, in $p_{T, ch jet}$ bins [10,20], [20,30],...
Table 5

Data from Figure 12 (middle) of preprint arxiv:2308.16128, Figure 2 (top panels, [10,20], [20,30] and [30,50] GeV/ $c$ only) of preprint arxiv:2308.16131

10.17182/hepdata.152376.v1/t5

Corrected $Δ_{recoil} (Δ φ)$ distributions measured for $R =$ 0.4 in pp collisions at $\sqrt{s} = 5.02$ TeV, in $p_{T, ch jet}$ bins [10,20], [20,30],...
Table 6

Data from Figure 12 (bottom) of preprint arxiv:2308.16128

10.17182/hepdata.152376.v1/t6

Corrected $Δ_{recoil} (Δ φ)$ distributions measured for $R =$ 0.5 in pp collisions at $\sqrt{s} = 5.02$ TeV, in $p_{T, ch jet}$ bins [10,20], [20,30],...
Table 7

Data from Figure 14 (top) of preprint arxiv:2308.16128

10.17182/hepdata.152376.v1/t7

Corrected $Δ_{recoil} (Δ φ)$ distributions measured for $R =$ 0.2 in Pb--Pb collisions at $\sqrt{s_{NN}} = 5.02$ TeV, in $p_{T, ch jet}$ bins [10,20], [20,30],...
Table 8

Data from Figure 14 (middle) of preprint arxiv:2308.16128, Figure 2 (top panels, [10,20], [20,30] and [30,50] GeV/ $c$ only) of preprint arxiv:2308.16131

10.17182/hepdata.152376.v1/t8

Corrected $Δ_{recoil} (Δ φ)$ distributions measured for $R =$ 0.4 in Pb--Pb collisions at $\sqrt{s_{NN}} = 5.02$ TeV, in $p_{T, ch jet}$ bins [10,20], [20,30],...
Table 9

Data from Figure 14 (bottom) of preprint arxiv:2308.16128

10.17182/hepdata.152376.v1/t9

Corrected $Δ_{recoil} (Δ φ)$ distributions measured for $R =$ 0.5 in Pb--Pb collisions at $\sqrt{s_{NN}} = 5.02$ TeV, in $p_{T, ch jet}$ bins [10,20], [20,30],...
Table 10

Data from Figure 19 of preprint arxiv:2308.16128

10.17182/hepdata.152376.v1/t10

$I_{AA} (Δ φ)$ distributions measured for $R =$ 0.2 in Pb--Pb collisions at $\sqrt{s_{NN}} = 5.02$ TeV, in $p_{T, ch jet}$ bins [10,20], [20,30], [30,50]...
Table 11

Data from Figure 20 of preprint arxiv:2308.16128, Figure 2 (bottom panles, [10,20], [20,30] and [30,50] GeV/ $c$ only) of preprint arxiv:2308.16131

10.17182/hepdata.152376.v1/t11

$I_{AA} (Δ φ)$ distributions measured for $R =$ 0.4 in Pb--Pb collisions at $\sqrt{s_{NN}} = 5.02$ TeV, in $p_{T, ch jet}$ bins [10,20], [20,30], [30,50]...
Table 12

Data from Figure 21 of preprint arxiv:2308.16128

10.17182/hepdata.152376.v1/t12

$I_{AA} (Δ φ)$ distributions measured for $R =$ 0.5 in Pb--Pb collisions at $\sqrt{s_{NN}} = 5.02$ TeV, in $p_{T, ch jet}$ bins [10,20], [20,30], [30,50]...
Table 13

Data from Figure 18 (top) of preprint arxiv:2308.16128

10.17182/hepdata.152376.v1/t13

$Δ_{recoil} (p_{T, ch jet})$ ratios $R =$ 0.2 / 0.4 in pp and Pb--Pb collisions at $\sqrt{s_{NN}} = 5.02$ TeV.
Table 14

Data from Figure 18 (middle) of preprint arxiv:2308.16128

10.17182/hepdata.152376.v1/t14

$Δ_{recoil} (p_{T, ch jet})$ ratios $R =$ 0.2 / 0.5 in pp and Pb--Pb collisions at $\sqrt{s_{NN}} = 5.02$ TeV.
Table 15

Data from Figure 18 (bottom) of preprint arxiv:2308.16128

10.17182/hepdata.152376.v1/t15

$Δ_{recoil} (p_{T, ch jet})$ ratios $R =$ 0.4 / 0.5 in pp and Pb--Pb collisions at $\sqrt{s_{NN}} = 5.02$ TeV.
Table 16

Data from Figure 16 (top) of preprint arxiv:2308.16128

10.17182/hepdata.152376.v1/t16

$Δ_{recoil} (p_{T, ch jet})$ for $R =$ 0.2, for various ${TT}_{sig}$ selections in Pb--Pb collisions at $\sqrt{s_{NN}} = 5.02$ TeV.
Table 17

Data from Figure 16 (bottom) of preprint arxiv:2308.16128

10.17182/hepdata.152376.v1/t17

$Δ_{recoil} (p_{T, ch jet})$ for $R =$ 0.4, for various ${TT}_{sig}$ selections in Pb--Pb collisions at $\sqrt{s_{NN}} = 5.02$ TeV.

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