Pion-kaon femtoscopy and the lifetime of the hadronic phase in Pb-Pb collisions at √<i><SUP>S</SUP></i><sub>NN</sub>=2 . 76 TeV



Acharya, S, Adamova, D, Adler, A, Adolfsson, J, Aggarwal, MM, Agha, S, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z
et al (show 1018 more authors) (2021) Pion-kaon femtoscopy and the lifetime of the hadronic phase in Pb-Pb collisions at √<i><SUP>S</SUP></i><sub>NN</sub>=2 . 76 TeV. PHYSICS LETTERS B, 813. p. 136030.

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Abstract

In this paper, the first femtoscopic analysis of pion–kaon correlations at the LHC is reported. The analysis was performed on the Pb–Pb collision data at sNN=2.76 TeV recorded with the ALICE detector. The non-identical particle correlations probe the spatio-temporal separation between sources of different particle species as well as the average source size of the emitting system. The sizes of the pion and kaon sources increase with centrality, and pions are emitted closer to the centre of the system and/or later than kaons. This is naturally expected in a system with strong radial flow and is qualitatively reproduced by hydrodynamic models. ALICE data on pion–kaon emission asymmetry are consistent with (3+1)-dimensional viscous hydrodynamics coupled to a statistical hadronisation model, resonance propagation, and decay code THERMINATOR 2 calculation, with an additional time delay between 1 and 2 fm/c for kaons. The delay can be interpreted as evidence for a significant hadronic rescattering phase in heavy-ion collisions at the LHC.

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 19 Mar 2021 09:01
Last Modified: 20 Jun 2024 18:53
DOI: 10.1016/j.physletb.2020.136030
Open Access URL: https://doi.org/10.1016/j.physletb.2020.136030
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3117740