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

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Adam , J , Brucken , E J , Chang , B , Kim , D J , Mieskolainen , M M , Orava , R , Rak , J , Räsänen , S S , Saarinen , S , Slupecki , M , Snellman , T W , Trzaska , W H , Vargyas , M , Viinikainen , J & The ALICE Collaboration 2017 , ' Enhanced production of multi-strange hadrons in high-multiplicity proton-proton collisions ' , Nature Physics , vol. 13 , no. 6 , pp. 535-539 . https://doi.org/10.1038/NPHYS4111

Title: Enhanced production of multi-strange hadrons in high-multiplicity proton-proton collisions
Author: Adam, J.; Brucken, E. J.; Chang, B.; Kim, D. J.; Mieskolainen, M. M.; Orava, R.; Rak, J.; Räsänen, S. S.; Saarinen, S.; Slupecki, M.; Snellman, T. W.; Trzaska, W. H.; Vargyas, M.; Viinikainen, J.; The ALICE collaboration
Contributor organization: Helsinki Institute of Physics
Date: 2017-06
Language: eng
Number of pages: 5
Belongs to series: Nature Physics
ISSN: 1745-2473
DOI: https://doi.org/10.1038/NPHYS4111
URI: http://hdl.handle.net/10138/209968
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)(1). 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(2-6). Strangeness enhancement, originally proposed as a signature of QGP formation in nuclear collisions(7), is more pronounced for multi-strange baryons. Several effects typical of heavy-ion phenomenology have been observed in high-multiplicity proton-proton (pp) collisions(8,9), 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(10,11), 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.
114 Physical sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion

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