Probing dense baryon-rich matter with virtual photons

Adamczewski-Musch, J.; Arnold, O.; Behnke, C.; Belounnas, A.; Belyaev, A.; Chlad, Lukáš; Kugler, Andrej; Rodriguez Ramos, Pablo; Sobolev, Yuri, G.; Svoboda, Ondřej; Tlustý, Pavel; Wagner, Vladimír

doi:https://dx.doi.org/10.1038/s41567-019-0583-8

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Probing dense baryon-rich matter with virtual photons

1.

SYSNO ASEP	0509905
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Probing dense baryon-rich matter with virtual photons
Author(s)	Adamczewski-Musch, J. (DE) Arnold, O. (DE) Behnke, C. (DE) Belounnas, A. (FR) Belyaev, A. (RU) Chlad, Lukáš (UJF-V)_{RID, ORCID, SAI} Kugler, Andrej (UJF-V)_{RID, ORCID, SAI} Rodriguez Ramos, Pablo (UJF-V) Sobolev, Yuri, G. (UJF-V)_ORCID Svoboda, Ondřej (UJF-V)_{RID, ORCID, SAI} Tlustý, Pavel (UJF-V)_{ORCID, SAI} Wagner, Vladimír (UJF-V)_{RID, ORCID, SAI}
Number of authors	116
Source Title	Nature Physics. - : Nature Publishing Group - ISSN 1745-2473 Roč. 15, č. 10 (2019), s. 1040-1047
Number of pages	8 s.
Publication form	Print - P
Language	eng - English
Country	GB - United Kingdom
Keywords	HADES ; collisions ; QCD matter
Subject RIV	BG - Nuclear, Atomic and Molecular Physics, Colliders
OECD category	Nuclear physics
R&D Projects	GA13-06759S GA ČR - Czech Science Foundation (CSF)
	LM2015049 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
	LTT17003 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
	EF16_013/0001677 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
Method of publishing	Limited access
Institutional support	UJF-V - RVO:61389005
UT WOS	000488590700019
EID SCOPUS	85069915641
DOI	10.1038/s41567-019-0583-8
Annotation	About 10 mu s after the Big Bang, the universe was filled-in addition to photons and leptons-with strong-interaction matter consisting of quarks and gluons, which transitioned to hadrons at temperatures close to kT = 150 MeV and densities several times higher than those found in nuclei. This quantum chromodynamics (QCD) matter can be created in the laboratory as a transient state by colliding heavy ions at relativistic energies. The different phases in which QCD matter may exist depend for example on temperature, pressure or baryochemical potential, and can be probed by studying the emission of electromagnetic radiation. Electron-positron pairs emerge from the decay of virtual photons, which immediately decouple from the strong interaction, and thus provide information about the properties of QCD matter at various stages. Here, we report the observation of virtual photon emission from baryon-rich QCD matter. The spectral distribution of the electron-positron pairs is nearly exponential, providing evidence for a source of temperature in excess of 70 MeV with constituents whose properties have been modified, thus reflecting peculiarities of strong-interaction QCD matter. Its bulk properties are similar to the dense matter formed in the final state of a neutron star merger, as apparent from recent multimessenger observation.
Workplace	Nuclear Physics Institute
Contact	Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228
Year of Publishing	2020
Electronic address	https://doi.org/10.1038/s41567-019-0583-8

Number of the records: 1