A1 Journal article (refereed)
Σ(1385)± resonance production in Pb–Pb collisions at √sNN = 5.02 TeV (2023)
ALICE Collaboration. (2023). Σ(1385)± resonance production in Pb–Pb collisions at √sNN = 5.02 TeV. European Physical Journal C, 83, Article 351. https://doi.org/10.1140/epjc/s10052-023-11475-1
JYU authors or editors
Publication details
All authors or editors: ALICE Collaboration
Journal or series: European Physical Journal C
ISSN: 1434-6044
eISSN: 1434-6052
Publication year: 2023
Publication date: 02/05/2023
Volume: 83
Article number: 351
Publisher: Springer Science and Business Media LLC
Publication country: Germany
Publication language: English
DOI: https://doi.org/10.1140/epjc/s10052-023-11475-1
Research data link: https://www.hepdata.net/record/ins2088201
Publication open access: Openly available
Publication channel open access: Open Access channel
Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/87577
Publication is parallel published: https://arxiv.org/abs/2205.13998
Abstract
Hadronic resonances are used to probe the hadron gas produced in the late stage of heavy-ion collisions since they decay on the same timescale, of the order of 1–10 fm/c, as the decoupling time of the system. In the hadron gas, (pseudo)elastic scatterings among the products of resonances that decayed before the kinetic freeze-out and regeneration processes counteract each other, the net effect depending on the resonance lifetime, the duration of the hadronic phase, and the hadronic cross sections at play. In this context, the Σ(1385)± particle is of particular interest as models predict that regeneration dominates over rescattering despite its relatively short lifetime of about 5.5 fm/c. The first measurement of the Σ(1385)± resonance production at midrapidity in Pb–Pb collisions at √sNN = 5.02 TeV with the ALICE detector is presented in this Letter. The resonances are reconstructed via their hadronic decay channel, Λπ, as a function of the transverse momentum (pT) and the collision centrality. The results are discussed in comparison with the measured yield of pions and with expectations from the statistical hadronization model as well as commonly employed event generators, including PYTHIA8/Angantyr and EPOS3 coupled to the UrQMD hadronic cascade afterburner. None of the models can describe the data. For Σ(1385)±, a similar behaviour as K∗(892)0 is observed in data unlike the predictions of EPOS3 with afterburner.
Keywords: particle physics
Contributing organizations
Related projects
- The strong interaction at the frontier of knowledge: fundamental research and applications- STRONG -2020
- Lappi, Tuomas
- European Commission
- Center of Excellence in Quark Matter
- Räsänen, Sami
- Research Council of Finland
- Center of Excellence in Quark Matter
- Kim, Dong
- Research Council of Finland
Ministry reporting: Yes
VIRTA submission year: 2023
JUFO rating: 2