Precision Measurement of Net-Proton-Number Fluctuations in Au plus Au Collisions at RHIC

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F25%3A00388347" target="_blank" >RIV/68407700:21340/25:00388347 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1103/9l69-2d7p" target="_blank" >https://doi.org/10.1103/9l69-2d7p</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/9l69-2d7p" target="_blank" >10.1103/9l69-2d7p</a>

Result language
angličtina
Original language name
Precision Measurement of Net-Proton-Number Fluctuations in Au plus Au Collisions at RHIC
Original language description
We report precision measurements on cumulants (C-n) and factorial cumulants (kappa(n)) of (net) proton number distributions up to fourth order in Au + Au collisions over center- of-mass energies root s(NN) = 7.7- 27 GeV from phase II of the Beam Energy Scan program at RHIC. (Anti)protons are selected at midrapidity (|y| < 0.5) within a transverse momentum range of 0.4 < p(T) < 2.0 GeV=c. Relative to various noncritical-point model calculations and peripheral collision 70%-80% data, the net proton C-4/C-2 measurement in 0%-5% collisions shows a minimum around 19.6 GeV for significance of deviation at similar to 2-5 sigma. A minimum in C-4/C-2 with respect to a noncritical baseline is expected to be a characteristic feature of the signature associated with a critical point in the QCD phase diagram. In addition, deviations from noncritical baselines around the same collision energy region are also seen in proton factorial cumulant ratios, especially in kappa(2)/kappa(1) and kappa(3)/kappa(1). Dynamical model calculations including a critical point are called for in order to understand these precision measurements.
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
—
OECD FORD branch
10303 - Particles and field physics

Project
<a href="/en/project/LM2023034" target="_blank" >LM2023034: Brookhaven National Laboratory - Participation of the Czech Republic</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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