Name: Search for jet quenching effects in high-multiplicity pp collisions at $\sqrt{s}$ = 13 TeV via di-jet acoplanarity
Creator: ALICE Collaboration
Published: 2024

Abstract (data abstract)

The ALICE Collaboration reports a search for jet quenching effects in high-multiplicity (HM) proton--proton collisions at $\sqrt{s} = 13$ TeV, using the semi-inclusive azimuthal-difference distribution $\Delta\varphi$ of charged-particle jets recoiling from a high transverse momentum (high-$p_{\mathrm{T,trig}}$) trigger hadron. Jet quenching may broaden the $\Delta\varphi$ distribution measured in HM events compared to that in minimum bias (MB) events. The measurement employs a $p_{\mathrm{T,trig}}$-differential observable for data-driven suppression of the contribution of multiple partonic interactions, which is the dominant background. While azimuthal broadening is indeed observed in HM compared to MB events, similar broadening for HM events is observed for simulations based on the PYTHIA 8 Monte Carlo generator, which does not incorporate jet quenching. We elucidate the origin of the broadening by comparing biases induced by HM selection in the data and simulations, and discuss its implications for the study of jet quenching in small collision systems.

Table 1

Data from Figure 1

10.17182/hepdata.151783.v1/t1

Probability distribution of $\mathrm{V0M}/\langle \mathrm{V0M} \rangle$ in MB pp collisions measured at $\sqrt{s}=13$ TeV.
Table 2

Data from Figure 3

10.17182/hepdata.151783.v1/t2

Fully-corrected $\Delta_{\mathrm{recoil}} (p_{\mathrm{T, jet}}^{\mathrm{ch}})$ distributions measured in MB and HM-selected events in pp collisions at $\sqrt{s}= 13$ TeV.
Table 3

Data from Figure 3

10.17182/hepdata.151783.v1/t3

Fully-corrected $\Delta_{\mathrm{recoil}} (\Delta\phi)$ distributions for $p_{\mathrm{T, jet}}^{\mathrm{ch}} \in (20, 40)$ GeV/$c$ measured in MB and HM-selected events in pp collisions...
Table 4

Data from Figure 3

10.17182/hepdata.151783.v1/t4

Fully-corrected $\Delta_{\mathrm{recoil}} (\Delta\phi)$ distributions for $p_{\mathrm{T, jet}}^{\mathrm{ch}} \in (40, 60)$ GeV/$c$ measured in MB and HM-selected events in pp collisions...
Table 5

Data from Figure 3

10.17182/hepdata.151783.v1/t5

Ratio of $\Delta_{\mathrm{recoil}} (p_{\mathrm{T, jet}}^{\mathrm{ch}})$ distributions measured in MB and HM-selected events in pp collisions at $\sqrt{s}= 13$ TeV.
Table 6

Data from Figure 3

10.17182/hepdata.151783.v1/t6

Ratio of $\Delta_{\mathrm{recoil}} (\Delta\phi)$ distributions for jets with $p_{\mathrm{T, jet}}^{\mathrm{ch}} \in (20, 40)$ GeV/$c$ measured in MB and HM-selected events...
Table 7

Data from Figure 3

10.17182/hepdata.151783.v1/t7

Ratio of $\Delta_{\mathrm{recoil}} (\Delta\phi)$ distributions for jets with $p_{\mathrm{T, jet}}^{\mathrm{ch}} \in (40, 60)$ GeV/$c$ measured in MB and HM-selected events...
Table 8

Data from Figure 6

10.17182/hepdata.151783.v1/t8

Distribution of probability per trigger hadron of the number of jets with $p_{\mathrm{T, jet}}^{\mathrm{ch}} > 15$ GeV/$c$ and $|\eta_{\mathrm{jet}}| <...

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