CERN Accelerating science

Article
Report number arXiv:1512.07227 ; CERN-PH-EP-2015-327
Title Multi-strange baryon production in p-Pb collisions at sNN=5.02 TeV
Related titleMulti-strange baryon production in p-Pb collisions at sNN=5.02
Author(s) ALICE Collaboration  Mostrar todos os 996 autores
Publication 2016-07-10
Imprint 22 Dec 2015
Number of pages 13
Note Comments: 19 pages, 5 captioned figures, 3 tables, authors from page 14, submitted to PLB, figures at http://aliceinfo.cern.ch/ArtSubmission/node/2241
19 pages, 5 captioned figures, 3 tables, authors from page 14, submitted to PLB, figures at http://aliceinfo.cern.ch/ArtSubmission/node/2241
In: Phys. Lett. B 758 (2016) 389-401
DOI 10.1016/j.physletb.2016.05.027
Subject category Nuclear Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ALICE
Abstract The multi-strange baryon yields in Pb--Pb 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 p-Pb 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 p-Pb collisions ranges over one order of magnitude and lies between those observed in pp and Pb-Pb 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 p-Pb. The yield of hyperons relative to charged pions is studied and compared with results from pp and Pb-Pb collisions. A statistical model is employed, which describes the change in the ratios with volume using a canonical suppression mechanism, in which the small volume causes a species-dependent relative reduction of hadron production. The calculations, in which the magnitude of the effect depends on the strangeness content, show good qualitative agreement with the data.
Copyright/License License
preprint: © 2015-2024 CERN (License: CC-BY-4.0)
publication: © 2016-2024 The Author(s) (License: CC-BY-4.0), sponsored by SCOAP³



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Email contact: cloizides@lbl.gov


 Record created 2015-12-24, last modified 2024-11-27


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