ΛK femtoscopy in Pb-Pb collisions at √sNN = 2.76 TeV

Scientific paper - Original scientific paper

• Author: S. Acharya
• Author: ...
• Author: Tome Antičić
• Author: ...
• Author: Filip Erhardt
• Author: ...
• Author: Sven Gotovac
• Author: ...
• Author: Marko Jerčić
• Author: ...
• Author: David Karatović
• Author: ...
• Author: Petra Lončar
• Author: ...
• Author: Eugen Mudnić
• Author: ...
• Author: Mirko Planinić
• Author: ...
• Author: Nikola Poljak
• Author: ...
• Author: Goran Simatović
• Author: ...
• Author: Linda Vicković
• Author: ...
• Author: N. Zurlo
• Collaboration: ALICE Collaboration
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

The first measurements of the scattering parameters of K pairs in all three charge combinations (K+, K−, and K0S) are presented. The results are achieved through a femtoscopic analysis of K correlations in Pb-Pb collisions at √sNN = 2.76 TeV recorded by ALICE at the Large Hadron Collider. The femtoscopic correlations result from strong final-state interactions and are fit with a parametrization allowing for both the characterization of the pair emission source and the measurement of the scattering parameters for the particle pairs. Extensive studies with the THERMINATOR 2 event generator provide a good description of the nonfemtoscopic background, which results mainly from collective effects, with unprecedented precision. Furthermore, together with HIJING simulations, this model is used to account for contributions from residual correlations induced by feed-down from particle decays. The extracted scattering parameters indicate that the strong force is repulsive in the K+ interaction and attractive in the K− interaction. The data hint that the K0S interaction is attractive ; however, the uncertainty of the result does not permit such a decisive conclusion. The results suggest an effect arising either from different quark-antiquark interactions between the pairs (ss in K+ and uu in K−) or from different net strangeness for each system (S = 0 for K+, and S = −2 for K−). Finally, the K systems exhibit source radii larger than expected from extrapolation from identical particl femtoscopic studies. This effect is interpreted as resulting from the separation in space-time of the single-particle and K source distributions.

• Keywords (english): Hadronic Physics and QCD; heavy ion: scattering; quark antiquark: interaction; correlation; final-state interaction; strong coupling; parametrization; CERN LHC Coll; strangeness; Monte Carlo; collective; ALICE; experimental results; 2760 GeV-cms/nucleon
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Physical Review C
• Numbering: vol. 103, no. 5, 055201
• p-ISSN: 2469-9985
• e-ISSN: 2469-9993
• DOI: https://doi.org/10.1103/PhysRevC.103.055201
• URN:NBN: urn:nbn:hr:217:621227
• Publication: 2021
• Document URL: https://link.aps.org/doi/10.1103/PhysRevC.103.055201
• Type of resource: Text
• Access conditions: Open access
• Public note: © 2021 CERN, for the ALICE Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Received 5 June 2020; accepted 30 March 2021; published 5 May 2021.
• Created on: 2024-09-14 18:30:39