Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Σ (1385) ± resonance production in Pb–Pb collisions at √sNN=5.02 TeV

Acharya, S. ; Basu, S. LU orcid ; Christiansen, P. LU ; Matonoha, O. LU ; Nassirpour, A.F. LU orcid ; Ohlson, A. LU ; Oskarsson, A. LU ; Richert, T. LU ; Rueda, O.V. LU and Silvermyr, D. LU orcid , et al. (2023) In European Physical Journal C 83(5).
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... (More)
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, Λ π , 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) is observed in data unlike the predictions of EPOS3 with afterburner. © 2023, CERN for the benefit of the ALICE Collaboration. (Less)
Please use this url to cite or link to this publication:
author
; ; ; ; ; ; ; ; and , et al. (More)
; ; ; ; ; ; ; ; ; ; and (Less)
author collaboration
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
European Physical Journal C
volume
83
issue
5
article number
351
publisher
Springer
external identifiers
  • scopus:85159950234
ISSN
1434-6044
DOI
10.1140/epjc/s10052-023-11475-1
language
English
LU publication?
yes
additional info
Number of authors = 1042 EID = 85159950234 Article no = 351 Affiliation = Acharya S., Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France, Variable Energy Cyclotron Centre, Homi Bhabha National Institute, Kolkata, India Affiliation = Zinovjev G., Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine, Kiev, Ukraine Affiliation = Zurlo N., INFN, Sezione di Pavia, Pavia, Italy, Università di Brescia, Brescia, Italy
id
4b788143-1c3b-4f40-bad5-a70d8915b2a0
date added to LUP
2023-11-14 15:44:34
date last changed
2023-11-14 15:45:52
@article{4b788143-1c3b-4f40-bad5-a70d8915b2a0,
  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, Λ π , 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) is observed in data unlike the predictions of EPOS3 with afterburner. © 2023, CERN for the benefit of the ALICE Collaboration.}},
  author       = {{Acharya, S. and Basu, S. and Christiansen, P. and Matonoha, O. and Nassirpour, A.F. and Ohlson, A. and Oskarsson, A. and Richert, T. and Rueda, O.V. and Silvermyr, D. and Staa, J. and Zurlo, N.}},
  issn         = {{1434-6044}},
  language     = {{eng}},
  number       = {{5}},
  publisher    = {{Springer}},
  series       = {{European Physical Journal C}},
  title        = {{Σ (1385) ± resonance production in Pb–Pb collisions at √sNN=5.02 TeV}},
  url          = {{http://dx.doi.org/10.1140/epjc/s10052-023-11475-1}},
  doi          = {{10.1140/epjc/s10052-023-11475-1}},
  volume       = {{83}},
  year         = {{2023}},
}