Skewness and kurtosis of mean transverse momentum fluctuations at the LHC energies

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F24%3A00585802" target="_blank" >RIV/61389005:_____/24:00585802 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/24:00585802 RIV/68407700:21340/24:00377084

Výsledek na webu

<a href="https://doi.org/10.1016/j.physletb.2024.138541" target="_blank" >https://doi.org/10.1016/j.physletb.2024.138541</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.physletb.2024.138541" target="_blank" >10.1016/j.physletb.2024.138541</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Skewness and kurtosis of mean transverse momentum fluctuations at the LHC energies

Popis výsledku v původním jazyce

The first measurements of skewness and kurtosis of mean transverse momentum (< p(T)>) fluctuations are reported in Pb-Pb collisions at root s(NN) = 5.02 TeV, Xe-Xe collisions at root s(NN) = 5.44 TeV and pp collisions at root s = 5.02 TeV using the ALICE detector. The measurements are carried out as a function of system size < dN(ch)/d eta >(1/3)(vertical bar eta vertical bar<0.5), using charged particles with transverse momentum (p(T)) and pseudorapidity (eta), in the range 0.2 < p(T) < 3.0 GeV/c and vertical bar eta vertical bar < 0.8, respectively. In Pb-Pb and Xe-Xe collisions, positive skewness is observed in the fluctuations of < p(T)> for all centralities, which is significantly larger than what would be expected in the scenario of independent particle emission. This positive skewness is considered a crucial consequence of the hydrodynamic evolution of the hot and dense nuclear matter created in heavy-ion collisions. Furthermore, similar observations of positive skewness for minimum bias pp collisions are also reported here. Kurtosis of < p(T)> fluctuations is found to be in good agreement with the kurtosis of Gaussian distribution, for most central Pb-Pb collisions. Hydrodynamic model calculations with MUSIC using Monte Carlo Glauber initial conditions are able to explain the measurements of both skewness and kurtosis qualitatively from semicentral to central collisions in Pb-Pb system. Color reconnection mechanism in PYTHIA8 model seems to play a pivotal role in capturing the qualitative behavior of the same measurements in pp collisions.

Název v anglickém jazyce

Skewness and kurtosis of mean transverse momentum fluctuations at the LHC energies

Popis výsledku anglicky

The first measurements of skewness and kurtosis of mean transverse momentum (< p(T)>) fluctuations are reported in Pb-Pb collisions at root s(NN) = 5.02 TeV, Xe-Xe collisions at root s(NN) = 5.44 TeV and pp collisions at root s = 5.02 TeV using the ALICE detector. The measurements are carried out as a function of system size < dN(ch)/d eta >(1/3)(vertical bar eta vertical bar<0.5), using charged particles with transverse momentum (p(T)) and pseudorapidity (eta), in the range 0.2 < p(T) < 3.0 GeV/c and vertical bar eta vertical bar < 0.8, respectively. In Pb-Pb and Xe-Xe collisions, positive skewness is observed in the fluctuations of < p(T)> for all centralities, which is significantly larger than what would be expected in the scenario of independent particle emission. This positive skewness is considered a crucial consequence of the hydrodynamic evolution of the hot and dense nuclear matter created in heavy-ion collisions. Furthermore, similar observations of positive skewness for minimum bias pp collisions are also reported here. Kurtosis of < p(T)> fluctuations is found to be in good agreement with the kurtosis of Gaussian distribution, for most central Pb-Pb collisions. Hydrodynamic model calculations with MUSIC using Monte Carlo Glauber initial conditions are able to explain the measurements of both skewness and kurtosis qualitatively from semicentral to central collisions in Pb-Pb system. Color reconnection mechanism in PYTHIA8 model seems to play a pivotal role in capturing the qualitative behavior of the same measurements in pp collisions.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10304 - Nuclear physics

Projekt

<a href="/cs/project/LM2023040" target="_blank" >LM2023040: Výzkumná infrastruktura pro experimenty v CERN</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Physics Letters. B

ISSN

0370-2693

e-ISSN

1873-2445

Svazek periodika

850

Číslo periodika v rámci svazku

MAR

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

14

Strana od-do

138541

Kód UT WoS článku

001203454800001

EID výsledku v databázi Scopus

2-s2.0-85187503035