PoS - Proceedings of Science
Volume 414 - 41st International Conference on High Energy physics (ICHEP2022) - Poster Session
Measurement of $R_{2}(\Delta\eta, \Delta\varphi)$ and $P_{2}(\Delta\eta, \Delta\varphi)$ correlation functions in pp collisions at $\sqrt{\textit{s}}$ = 13~TeV using ALICE data
B. Sahoo*  on behalf of the ALICE collaboration
Full text: pdf
Pre-published on: December 06, 2022
Published on: June 15, 2023
Two-particle normalized cumulants of particle number correlations ($R_{2}$)
and transverse momentum correlations ($P_{2}$)[1], measured as a function of
relative pseudorapidity and azimuthal angle difference $(\Delta\eta, \Delta\varphi)$,
provide key information about particle production mechanisms,
diffusivity, and conservation of charge and momentum in high-energy
collisions. To complement the recent ALICE measurements in Pb--Pb
collisions, as well as for better understanding of the jet
contribution and nature of collectivity in small systems, these
observables are measured in pp collisions at $\sqrt{\textit{s}}$ = 13 TeV
with similar transverse momentum range, 0.2 $\leq$ $\textit{p}_{\rm T}$ $\leq$ 2.0
$\rm{GeV}/\textit{c}$. The $R_{2}$ and $P_{2}$ results on the near-
and away-side are qualitatively similar, but differ quantitatively. A
much narrower near-side peak is observed for $P_{2}$ compared to
$R_{2}$ for both charge-independent and charge-dependent combinations,
as in the recently published ALICE results for p--Pb and Pb--Pb
collisions[2]. Since these results are sensitive to the interplay between the underlying event and mini-jets in pp collisions, they not only establish a baseline for heavy-ion collisions, but also allow a better understanding of signals that are compatible with the presence of collective effects in small systems.
DOI: https://doi.org/10.22323/1.414.1138
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