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Enhanced production of multi-strange hadrons in high-multiplicity proton-proton collisions

Adam, J. ; Christiansen, Peter LU ; Ljunggren, Martin LU ; Oskarsson, Anders LU ; Richert, Tuva LU ; Silvermyr, David LU orcid ; Stenlund, Evert LU ; Vislavicius, Vytautas LU and Zyzak, M. (2017) In Nature Physics 13(6). p.535-539
Abstract
At sufficiently high temperature and energy density, nuclear matter undergoes a transition to a phase in which quarks and gluons are not confined: the quark-gluon plasma (QGP). Such an exotic state of strongly interacting quantum chromodynamics matter is produced in the laboratory in heavy nuclei high-energy collisions, where an enhanced production of strange hadrons is observed. Strangeness enhancement, originally proposed as a signature of QGP formation in nuclear collisions, is more pronounced for multi-strange baryons. Several effects typical of heavy-ion phenomenology have been observed in high-multiplicity proton-proton (pp) collisions, but the enhanced production of multi-strange particles has not been reported so far. Here we... (More)
At sufficiently high temperature and energy density, nuclear matter undergoes a transition to a phase in which quarks and gluons are not confined: the quark-gluon plasma (QGP). Such an exotic state of strongly interacting quantum chromodynamics matter is produced in the laboratory in heavy nuclei high-energy collisions, where an enhanced production of strange hadrons is observed. Strangeness enhancement, originally proposed as a signature of QGP formation in nuclear collisions, is more pronounced for multi-strange baryons. Several effects typical of heavy-ion phenomenology have been observed in high-multiplicity proton-proton (pp) collisions, but the enhanced production of multi-strange particles has not been reported so far. Here we present the first observation of strangeness enhancement in high-multiplicity proton-proton collisions. We find that the integrated yields of strange and multi-strange particles, relative to pions, increases significantly with the event charged-particle multiplicity. The measurements are in remarkable agreement with the p-Pb collision results, indicating that the phenomenon is related to the final system created in the collision. In high-multiplicity events strangeness production reaches values similar to those observed in Pb-Pb collisions, where a QGP is formed. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. (Less)
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author collaboration
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Heavy ions, Lead alloys, Quantum theory, Charged particle multiplicities, High-energy collisions, Nuclear collisions, Proton proton collisions, Quantum chromodynamics, Quark-gluon plasma, Strangeness enhancement, Strangeness production, Hadrons
in
Nature Physics
volume
13
issue
6
pages
5 pages
publisher
Nature Publishing Group
external identifiers
  • scopus:85019032501
ISSN
1745-2473
DOI
10.1038/nphys4111
language
English
LU publication?
yes
id
a345514c-0c5c-49ee-b6a9-a89e0ae5421e
date added to LUP
2022-03-29 14:16:57
date last changed
2023-04-02 23:01:55
@article{a345514c-0c5c-49ee-b6a9-a89e0ae5421e,
  abstract     = {{At sufficiently high temperature and energy density, nuclear matter undergoes a transition to a phase in which quarks and gluons are not confined: the quark-gluon plasma (QGP). Such an exotic state of strongly interacting quantum chromodynamics matter is produced in the laboratory in heavy nuclei high-energy collisions, where an enhanced production of strange hadrons is observed. Strangeness enhancement, originally proposed as a signature of QGP formation in nuclear collisions, is more pronounced for multi-strange baryons. Several effects typical of heavy-ion phenomenology have been observed in high-multiplicity proton-proton (pp) collisions, but the enhanced production of multi-strange particles has not been reported so far. Here we present the first observation of strangeness enhancement in high-multiplicity proton-proton collisions. We find that the integrated yields of strange and multi-strange particles, relative to pions, increases significantly with the event charged-particle multiplicity. The measurements are in remarkable agreement with the p-Pb collision results, indicating that the phenomenon is related to the final system created in the collision. In high-multiplicity events strangeness production reaches values similar to those observed in Pb-Pb collisions, where a QGP is formed. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.}},
  author       = {{Adam, J. and Christiansen, Peter and Ljunggren, Martin and Oskarsson, Anders and Richert, Tuva and Silvermyr, David and Stenlund, Evert and Vislavicius, Vytautas and Zyzak, M.}},
  issn         = {{1745-2473}},
  keywords     = {{Heavy ions; Lead alloys; Quantum theory; Charged particle multiplicities; High-energy collisions; Nuclear collisions; Proton proton collisions; Quantum chromodynamics; Quark-gluon plasma; Strangeness enhancement; Strangeness production; Hadrons}},
  language     = {{eng}},
  number       = {{6}},
  pages        = {{535--539}},
  publisher    = {{Nature Publishing Group}},
  series       = {{Nature Physics}},
  title        = {{Enhanced production of multi-strange hadrons in high-multiplicity proton-proton collisions}},
  url          = {{http://dx.doi.org/10.1038/nphys4111}},
  doi          = {{10.1038/nphys4111}},
  volume       = {{13}},
  year         = {{2017}},
}