Measurements of Proton High-Order Cumulants in root s(NN)=3 GeV Au + Au Collisions and Implications for the QCD Critical Point

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F22%3A00359922" target="_blank" >RIV/68407700:21340/22:00359922 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1103/PhysRevLett.128.202303" target="_blank" >https://doi.org/10.1103/PhysRevLett.128.202303</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevLett.128.202303" target="_blank" >10.1103/PhysRevLett.128.202303</a>

Result language
angličtina
Original language name
Measurements of Proton High-Order Cumulants in root s(NN)=3 GeV Au + Au Collisions and Implications for the QCD Critical Point
Original language description
We report cumulants of the proton multiplicity distribution from dedicated fixed-target Au + Au collisions at root s(NN) = 3.0 GeV, measured by the STAR experiment in the kinematic acceptance of rapidity (y) and transverse momentum (p(T)) within -0.5 < y < 0 and 0.4 < p(T) < 2.0 GeV/c. In the most central 0%-5% collisions, a proton cumulant ratio is measured to be C-4/C-2 = -0.85 +/- 0.09 (stat) +/- 0.82 (syst), which is 2 sigma below the Poisson baseline with respect to both the statistical and systematic uncertainties. The hadronic transport UrQMD model reproduces our C-4/C-2 in the measured acceptance. Compared to higher energy results and the transport model calculations, the suppression in C-4/C-2 is consistent with fluctuations driven by baryon number conservation and indicates an energy regime dominated by hadronic interactions. These data imply that the QCD critical region, if created in heavy-ion collisions, could only exist at energies higher than 3 GeV.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

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)

Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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