Probing dense baryon-rich matter with virtual photons
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F19%3A00509905" target="_blank" >RIV/61389005:_____/19:00509905 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1038/s41567-019-0583-8" target="_blank" >https://doi.org/10.1038/s41567-019-0583-8</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1038/s41567-019-0583-8" target="_blank" >10.1038/s41567-019-0583-8</a>
Alternative languages
Result language
angličtina
Original language name
Probing dense baryon-rich matter with virtual photons
Original language description
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.
Czech name
—
Czech description
—
Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10304 - Nuclear physics
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Nature Physics
ISSN
1745-2473
e-ISSN
—
Volume of the periodical
15
Issue of the periodical within the volume
10
Country of publishing house
GB - UNITED KINGDOM
Number of pages
8
Pages from-to
1040-1047
UT code for WoS article
000488590700019
EID of the result in the Scopus database
2-s2.0-85069915641