Abstract (data abstract)

Measurements of charged-particle production in pp, p-Pb, and Pb-Pb collisions in the toward, away, and transverse regions with the ALICE detector are discussed. These regions are defined event-by-event relative to the azimuthal direction of the charged trigger particle, which is the reconstructed particle with the largest transverse momentum (

p_{T}^{trig}

) in the range

8 < p_{T}^{trig} < 15 GeV / c

. The toward and away regions contain the primary and recoil jets, respectively; both regions are accompanied by the underlying event (UE). In contrast, the transverse region perpendicular to the direction of the trigger particle is dominated by the so-called UE dynamics, and includes also contributions from initial- and final-state radiation. The relative transverse activity classifier,

R_{T} = N_{ch}^{T} / ⟨ N_{ch}^{T} ⟩

, is used to group events according to their UE activity, where

N_{ch}^{T}

is the charged-particle multiplicity per event in the transverse region and

⟨ N_{ch}^{T} ⟩

is the mean value over the whole analysed sample. The energy dependence of the

R_{T}

distributions in pp collisions at

\sqrt{s} = 2.76, 5.02, 7

, and

13 TeV

is reported, exploring the Koba-Nielsen-Olesen (KNO) scaling properties of the multiplicity distributions. The first measurements of charged-particle

p_{T}

spectra as a function of

R_{T}

in the three azimuthal regions in pp, p-Pb, and Pb-Pb collisions at

\sqrt{s_{NN}} = 5.02 TeV

are also reported. Data are compared with predictions obtained from the event generators

PYTHIA 8

and

EPOS LHC

. This set of measurements is expected to contribute to the understanding of the origin of collective-like effects in small collision systems (pp and p-Pb).

Table 1

Data from Figure 3, top panel (magenta full squares)

10.17182/hepdata.146104.v1/t1

$R_{T}$ distribution using events with trigger particles $5 < p_{T}^{trig} < 40 GeV / c$ in the pseudorapidity range of $| η | < 0.8$ and with $p_{T} > 0.5 GeV / c$ in pp collisions...
Table 2

Data from Figure 3, top panel (green full circles)

10.17182/hepdata.146104.v1/t2

$R_{T}$ distribution using events with trigger particles $5 < p_{T}^{trig} < 40 GeV / c$ in the pseudorapidity range of $| η | < 0.8$ and with $p_{T} > 0.5 GeV / c$ in pp collisions...
Table 3

Data from Figure 3, top panel (blue open squares)

10.17182/hepdata.146104.v1/t3

$R_{T}$ distribution using events with trigger particles $5 < p_{T}^{trig} < 40 GeV / c$ in the pseudorapidity range of $| η | < 0.8$ and with $p_{T} > 0.5 GeV / c$ in pp collisions...
Table 4

Data from Figure 3, top panel (orange open circles)

10.17182/hepdata.146104.v1/t4

$R_{T}$ distribution using events with trigger particles $5 < p_{T}^{trig} < 40 GeV / c$ in the pseudorapidity range of $| η | < 0.8$ and with $p_{T} > 0.5 GeV / c$ in pp collisions...
Table 5

Data from Figure 4, top left panel

10.17182/hepdata.146104.v1/t5

$p_{T}$ as a function of $R_{T}$ in the toward region for different $R_{T}$ intervals using events with trigger particles $8 < p_{T}^{trig} < 15 GeV / c$ ...
Table 6

Data from Figure 4, top middle panel

10.17182/hepdata.146104.v1/t6

$p_{T}$ as a function of $R_{T}$ in the away region for different $R_{T}$ intervals using events with trigger particles $8 < p_{T}^{trig} < 15 GeV / c$ ...
Table 7

Data from Figure 4, top right panel

10.17182/hepdata.146104.v1/t7

$p_{T}$ as a function of $R_{T}$ in the transverse region for different $R_{T}$ intervals using events with trigger particles $8 < p_{T}^{trig} < 15 GeV / c$ ...
Table 8

Data from Figure 5, top left panel

10.17182/hepdata.146104.v1/t8

$p_{T}$ as a function of $R_{T}$ in the toward region for different $R_{T}$ intervals using events with trigger particles $8 < p_{T}^{trig} < 15 GeV / c$ ...
Table 9

Data from Figure 5, top middle panel

10.17182/hepdata.146104.v1/t9

$p_{T}$ as a function of $R_{T}$ in the away region for different $R_{T}$ intervals using events with trigger particles $8 < p_{T}^{trig} < 15 GeV / c$ ...
Table 10

Data from Figure 5, top right panel

10.17182/hepdata.146104.v1/t10

$p_{T}$ as a function of $R_{T}$ in the transverse region for different $R_{T}$ intervals using events with trigger particles $8 < p_{T}^{trig} < 15 GeV / c$ ...
Table 11

Data from Figure 6, top left panel

10.17182/hepdata.146104.v1/t11

$p_{T}$ as a function of $R_{T}$ in the toward region for different $R_{T}$ intervals using events with trigger particles $8 < p_{T}^{trig} < 15 GeV / c$ ...
Table 12

Data from Figure 6, top middle panel

10.17182/hepdata.146104.v1/t12

$p_{T}$ as a function of $R_{T}$ in the away region for different $R_{T}$ intervals using events with trigger particles $8 < p_{T}^{trig} < 15 GeV / c$ ...
Table 13

Data from Figure 6, top right panel

10.17182/hepdata.146104.v1/t13

$p_{T}$ as a function of $R_{T}$ in the transverse region for different $R_{T}$ intervals using events with trigger particles $8 < p_{T}^{trig} < 15 GeV / c$ ...
Table 14

Data from Figure 7, left panel (cyan open circles)

10.17182/hepdata.146104.v1/t14

Average $p_{T}$ as a function of $R_{T}$ in the toward region using events with trigger particles $8 < p_{T}^{trig} < 15 GeV / c$ in the pseudorapidity...
Table 15

Data from Figure 7, left panel (cyan open squares)

10.17182/hepdata.146104.v1/t15

Average $p_{T}$ as a function of $R_{T}$ in the toward region using events with trigger particles $8 < p_{T}^{trig} < 15 GeV / c$ in the pseudorapidity...
Table 16

Data from Figure 7, left panel (cyan open diamonds)

10.17182/hepdata.146104.v1/t16

Average $p_{T}$ as a function of $R_{T}$ in the toward region using events with trigger particles $8 < p_{T}^{trig} < 15 GeV / c$ in the pseudorapidity...
Table 17

Data from Figure 7, middle panel (magenta open circles)

10.17182/hepdata.146104.v1/t17

Average $p_{T}$ as a function of $R_{T}$ in the away region using events with trigger particles $8 < p_{T}^{trig} < 15 GeV / c$ in the pseudorapidity...
Table 18

Data from Figure 7, middle panel (magenta open squares)

10.17182/hepdata.146104.v1/t18

Average $p_{T}$ as a function of $R_{T}$ in the away region using events with trigger particles $8 < p_{T}^{trig} < 15 GeV / c$ in the pseudorapidity...
Table 19

Data from Figure 7, middle panel (magenta open diamonds)

10.17182/hepdata.146104.v1/t19

Average $p_{T}$ as a function of $R_{T}$ in the away region using events with trigger particles $8 < p_{T}^{trig} < 15 GeV / c$ in the pseudorapidity...
Table 20

Data from Figure 7, right panel (orange open circles)

10.17182/hepdata.146104.v1/t20

Average $p_{T}$ as a function of $R_{T}$ in the transverse region using events with trigger particles $8 < p_{T}^{trig} < 15 GeV / c$ in the pseudorapidity...
Table 21

Data from Figure 7, right panel (orange open squares)

10.17182/hepdata.146104.v1/t21

Average $p_{T}$ as a function of $R_{T}$ in the transverse region using events with trigger particles $8 < p_{T}^{trig} < 15 GeV / c$ in the pseudorapidity...
Table 22

Data from Figure 7, right panel (orange open diamonds)

10.17182/hepdata.146104.v1/t22

Average $p_{T}$ as a function of $R_{T}$ in the transverse region using events with trigger particles $8 < p_{T}^{trig} < 15 GeV / c$ in the pseudorapidity...
Table 23

Data from Figure 9, top left panel (cyan open circles)

10.17182/hepdata.146104.v1/t23

$p_{T}$ -integrated yield normalised to $$ as a function of $R_{T}$ in the toward region using events with trigger particles $8 < p_{T}^{trig} < 15 GeV / c$ ...
Table 24

Data from Figure 9, top left panel (magenta open squares)

10.17182/hepdata.146104.v1/t24

$p_{T}$ -integrated yield normalised to $$ as a function of $R_{T}$ in the away region using events with trigger particles $8 < p_{T}^{trig} < 15 GeV / c$ ...
Table 25

Data from Figure 9, top middle panel (cyan open circles)

10.17182/hepdata.146104.v1/t25

$p_{T}$ -integrated yield normalised to $$ as a function of $R_{T}$ in the toward region using events with trigger particles $8 < p_{T}^{trig} < 15 GeV / c$ ...
Table 26

Data from Figure 9, top middle panel (magenta open squares)

10.17182/hepdata.146104.v1/t26

$p_{T}$ -integrated yield normalised to $$ as a function of $R_{T}$ in the away region using events with trigger particles $8 < p_{T}^{trig} < 15 GeV / c$ ...
Table 27

Data from Figure 9, top right panel (cyan open circles)

10.17182/hepdata.146104.v1/t27

$p_{T}$ -integrated yield normalised to $$ as a function of $R_{T}$ in the toward region using events with trigger particles $8 < p_{T}^{trig} < 15 GeV / c$ ...
Table 28

Data from Figure 9, top right panel (magenta open squares)

10.17182/hepdata.146104.v1/t28

$p_{T}$ -integrated yield normalised to $$ as a function of $R_{T}$ in the away region using events with trigger particles $8 < p_{T}^{trig} < 15 GeV / c$ ...

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