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Peter Christiansen Profile

Peter Christiansen

Professor

Peter Christiansen Profile

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

Author

  • J. Adam
  • Peter Christiansen
  • Martin Ljunggren
  • Anders Oskarsson
  • Tuva Richert
  • David Silvermyr
  • Evert Stenlund
  • Vytautas Vislavicius
  • M. Zyzak

Summary, in English

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.

Department/s

  • eSSENCE: The e-Science Collaboration
  • Particle and nuclear physics

Publishing year

2017

Language

English

Pages

535-539

Publication/Series

Nature Physics

Volume

13

Issue

6

Document type

Journal article

Publisher

Nature Publishing Group

Topic

  • Physical Sciences

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

Status

Published

ISBN/ISSN/Other

  • ISSN: 1745-2473