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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F25%3A00643875" target="_blank" >RIV/61389005:_____/25:00643875 - isvavai.cz</a>

Výsledek na webu

<a href="https://journals.aps.org/prl/abstract/10.1103/9l69-2d7p" target="_blank" >https://journals.aps.org/prl/abstract/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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10304 - Nuclear physics

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

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

135

Číslo periodika v rámci svazku

14

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

142301

Kód UT WoS článku

001615629000001

EID výsledku v databázi Scopus

2-s2.0-105019114662