Speaker
Description
ALICE data recorded from pp collisions at $\sqrt{\it s}=13$ TeV are analyzed to study the mean transverse momentum ($p_{\rm T}$) fluctuations. The study is motivated by the idea that non-monotonic changes in $p_{\rm T}$ correlations with varying energy, if observed, may be taken as an indicator for the QGP formation. The mean $p_{\rm T}$ fluctuations are studied in terms of the two-particle correlator, $\sqrt{C_m}/M(p_{\rm T})_m$, which measures the strength of such fluctuations in units of mean $p_{\rm T}$. The dependence of $\sqrt{C_m}/M(p_{\rm T})_m$ on particle multiplicity in varying $p_{\rm T}$ window widths and positions has been analyzed. A study of soft, intermediate and hard $p_{\rm T}$ would significantly impact on understanding of equilibrium and thermal (radial flow), as well as non-thermal (jets/minijets) sources for $p_{\rm T}$ fluctuations.
A decreasing trend in correlator values with increasing charged particle multiplicity has been observed, following a power-law pattern. The dependence of the power--law coefficient on different $p_{\rm T}$ ranges has also been analyzed. To further investigate collective effects, within a common multiplicity range, correlators have been studied across different collision systems, such as p--Pb and Pb--Pb at $\sqrt{\it s_{\rm NN}}=5.02$ TeV and Xe--Xe at $\sqrt{\it s_{\rm NN}}=5.44$ TeV. The findings are compared with predictions from Monte Carlo models, like PYTHIA (pQCD string) and EPOS (core–corona), to gain further insight.
| Category | Experiment |
|---|---|
| Collaboration (if applicable) | ALICE |
