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Multi-strange baryon production in pPb collisions at sNN=5.02 TeV

Adam, J. ; Adamova, D. ; Aggarwal, M.M ; Aglieri Rinella, G ; Agnello, M. ; Agrawal, N ; Christiansen, Peter LU ; Ljunggren, Martin LU ; Oskarsson, Anders LU and Richert, Tuva LU , et al. (2016) In Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 758. p.389-401
Abstract
The multi-strange baryon yields in PbPb collisions have been shown to exhibit an enhancement relative to pp reactions. In this work, Ξ and Ω production rates have been measured with the ALICE experiment as a function of transverse momentum, pT, in pPb collisions at a centre-of-mass energy of sNN=5.02 TeV. The results cover the kinematic ranges 0.6 GeV/c<pT<7.2 GeV/c and 0.8 GeV/c<pT<5 GeV/c, for Ξ and Ω respectively, in the common rapidity interval -0.5<yCMS<0. Multi-strange baryons have been identified by reconstructing their weak decays into charged particles. The pT spectra are analysed as a function of event charged-particle multiplicity, which in pPb collisions ranges over one order of magnitude and lies between... (More)
The multi-strange baryon yields in PbPb collisions have been shown to exhibit an enhancement relative to pp reactions. In this work, Ξ and Ω production rates have been measured with the ALICE experiment as a function of transverse momentum, pT, in pPb collisions at a centre-of-mass energy of sNN=5.02 TeV. The results cover the kinematic ranges 0.6 GeV/c<pT<7.2 GeV/c and 0.8 GeV/c<pT<5 GeV/c, for Ξ and Ω respectively, in the common rapidity interval -0.5<yCMS<0. Multi-strange baryons have been identified by reconstructing their weak decays into charged particles. The pT spectra are analysed as a function of event charged-particle multiplicity, which in pPb collisions ranges over one order of magnitude and lies between those observed in pp and PbPb collisions. The measured pT distributions are compared to the expectations from a Blast-Wave model. The parameters which describe the production of lighter hadron species also describe the hyperon spectra in high multiplicity pPb collisions. The yield of hyperons relative to charged pions is studied and compared with results from pp and PbPb collisions. A continuous increase in the yield ratios as a function of multiplicity is observed in pPb data, the values of which range from those measured in minimum bias pp to the ones in PbPb collisions. A statistical model qualitatively describes this multiplicity dependence using a canonical suppression mechanism, in which the small volume causes a relative reduction of hadron production dependent on the strangeness content of the hyperon. © 2016 The Author(s). (Less)
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author collaboration
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
volume
758
pages
13 pages
publisher
Elsevier
external identifiers
  • wos:000377330500053
  • scopus:85040627709
ISSN
0370-2693
DOI
10.1016/j.physletb.2016.05.027
language
English
LU publication?
yes
additional info
Cited By :8 Export Date: 29 June 2017
id
319b9ab3-95d4-41dd-bfa8-416396727c88
date added to LUP
2017-06-29 09:54:37
date last changed
2023-07-25 13:38:27
@article{319b9ab3-95d4-41dd-bfa8-416396727c88,
  abstract     = {{The multi-strange baryon yields in PbPb collisions have been shown to exhibit an enhancement relative to pp reactions. In this work, Ξ and Ω production rates have been measured with the ALICE experiment as a function of transverse momentum, pT, in pPb collisions at a centre-of-mass energy of sNN=5.02 TeV. The results cover the kinematic ranges 0.6 GeV/c&lt;pT&lt;7.2 GeV/c and 0.8 GeV/c&lt;pT&lt;5 GeV/c, for Ξ and Ω respectively, in the common rapidity interval -0.5&lt;yCMS&lt;0. Multi-strange baryons have been identified by reconstructing their weak decays into charged particles. The pT spectra are analysed as a function of event charged-particle multiplicity, which in pPb collisions ranges over one order of magnitude and lies between those observed in pp and PbPb collisions. The measured pT distributions are compared to the expectations from a Blast-Wave model. The parameters which describe the production of lighter hadron species also describe the hyperon spectra in high multiplicity pPb collisions. The yield of hyperons relative to charged pions is studied and compared with results from pp and PbPb collisions. A continuous increase in the yield ratios as a function of multiplicity is observed in pPb data, the values of which range from those measured in minimum bias pp to the ones in PbPb collisions. A statistical model qualitatively describes this multiplicity dependence using a canonical suppression mechanism, in which the small volume causes a relative reduction of hadron production dependent on the strangeness content of the hyperon. © 2016 The Author(s).}},
  author       = {{Adam, J. and Adamova, D. and Aggarwal, M.M and Aglieri Rinella, G and Agnello, M. and Agrawal, N and Christiansen, Peter and Ljunggren, Martin and Oskarsson, Anders and Richert, Tuva and Silvermyr, David and Sogaard, Carsten and Stenlund, Evert and Vislavicius, Vytautas}},
  issn         = {{0370-2693}},
  language     = {{eng}},
  pages        = {{389--401}},
  publisher    = {{Elsevier}},
  series       = {{Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics}},
  title        = {{Multi-strange baryon production in pPb collisions at sNN=5.02 TeV}},
  url          = {{http://dx.doi.org/10.1016/j.physletb.2016.05.027}},
  doi          = {{10.1016/j.physletb.2016.05.027}},
  volume       = {{758}},
  year         = {{2016}},
}