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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review Letters

ISSN

0031-9007

e-ISSN

1079-7114

Svazek periodika

128

Číslo periodika v rámci svazku

20

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

—

Kód UT WoS článku

000807220600006

EID výsledku v databázi Scopus

2-s2.0-85131459646