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

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 chro- modynamics matter is produced in the laboratory in heavy nuclei high-energy collisions, where an enhanced production of strange hadrons is observed2–6. Strangeness enhancement, originally proposed as a signature of QGP formation in nuc- lear collisions7 , is more pronounced for multi-strange baryons. Several effects typical of heavy-ion phenomenology have been observed in high-multiplicity proton–proton (pp) collisions8,9 , 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 signifi- cantly with the event charged-particle multiplicity. The mea- surements are in remarkable agreement with the p–Pb colli- sion results10,11, 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.

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Eser Adı
(dc.title)
Enhanced production of multi-strange hadrons in high-multiplicity proton–proton collisions
Yayın Türü
(dc.type)
Makale
Yazar/lar
(dc.contributor.author)
KARASU UYSAL, Ayben
Yazar/lar
(dc.contributor.author)
ALICE Collaboration
DOI Numarası
(dc.identifier.doi)
http://dx.doi.org/10.1038/nphys4111
Atıf Dizini
(dc.source.database)
Wos
Atıf Dizini
(dc.source.database)
Scopus
Konu Başlıkları
(dc.subject)
Multi-Strange Hadrons
Konu Başlıkları
(dc.subject)
LHC
Konu Başlıkları
(dc.subject)
ALICE
Yayın Tarihi
(dc.date.issued)
2017
Kayıt Giriş Tarihi
(dc.date.accessioned)
2019-07-08T08:00:57Z
Açık Erişim tarihi
(dc.date.available)
2019-07-08T08:00:57Z
Orcid
(dc.identifier.orcid)
0000-0001-6297-2532
Özet
(dc.description.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 chro- modynamics matter is produced in the laboratory in heavy nuclei high-energy collisions, where an enhanced production of strange hadrons is observed2–6. Strangeness enhancement, originally proposed as a signature of QGP formation in nuc- lear collisions7 , is more pronounced for multi-strange baryons. Several effects typical of heavy-ion phenomenology have been observed in high-multiplicity proton–proton (pp) collisions8,9 , 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 signifi- cantly with the event charged-particle multiplicity. The mea- surements are in remarkable agreement with the p–Pb colli- sion results10,11, 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.
Tek Biçim Adres
(dc.identifier.uri)
https://hdl.handle.net/20.500.12498/609
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