Abstract
ALICE, an experiment dedicated to the analysis of heavy-ion collisions is ideally suited for femtoscopic studies, with its excellent particle identification capabilities at low and intermediate momenta. It measures correlations of pions which provide crucial information on the size and the dynamics of the system. Recent results for femtoscopic radii from p+p, p–Pb and Pb–Pb collisions will be discussed with emphasis on similarities and differences between small and large systems. In particular the multiplicity and transverse momentum dependence of the radii will be discussed.
Highlights
Femtoscopy is a technique, which relies on the measurement of the two-particle correlations as a function of the relative momentum of the pair
In the correlation function constructed versus the relative momentum q = p1 − p2 it manifests as an increased correlation at low q which has roughly a Gaussian shape [4, 5]
We have shown a comprehensive collection of femtoscopic results from the ALICE experiment, covering the p+p, p–Pb, and Pb–Pb collisions
Summary
Femtoscopy is a technique, which relies on the measurement of the two-particle correlations as a function of the relative momentum of the pair. All experimental data collected so far have shown a linear dependence of the total femtoscopic volume of the system (obtained as a product of the radii in three dimensions) on event multiplicity We extend this measurement to the new energy regime, and perform it, in a consistent way, in small (p+p and p–Pb) and large (Pb–Pb) systems. Such increase is universally reproduced in models of heavy-ion collisions, while its interpretation in small systems is less clear. In particular strong collective movement of matter (flow), which appears naturally in such models, leads to the decrease of the apparent size of the system with increasing pair momentum Model predictions for this effect have become precise enough to speculate on the relative strenght of this decrease in different directions. In this work we compare the data in heavy-ion collisions and its model description to the effects observed in small systems and speculate on the role of collective flow there
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