Search for the Chiral Magnetic Effect with charge-dependent azimuthal correlations in Xe-Xe collisions at root SNN=5.44 TeV

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F24%3A00379781" target="_blank" >RIV/68407700:21340/24:00379781 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.physletb.2024.138862" target="_blank" >https://doi.org/10.1016/j.physletb.2024.138862</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.physletb.2024.138862" target="_blank" >10.1016/j.physletb.2024.138862</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Search for the Chiral Magnetic Effect with charge-dependent azimuthal correlations in Xe-Xe collisions at root SNN=5.44 TeV

Popis výsledku v původním jazyce

Charge-dependent two- and three-particle correlations measured in Xe-Xe collisions at root S-NN = 5.44 TeV are presented. Results are obtained for charged particles in the pseudorapidity range |eta| < 0.8 and transverse momentum interval 0.2 <= p(T) < 5.0 GeV/c for different collision centralities. The three-particle correlator gamma(alpha beta)=< cos(phi(alpha) +phi(beta) - 2 psi(2))>, calculated for different combinations of charge sign alpha and beta, is expected to be sensitive to the presence of the Chiral Magnetic Effect (CME). Its magnitude is similar to the one observed in Pb-Pb collisions in contrast to a smaller CME signal in Xe-Xe collisions than in Pb-Pb collisions predicted by Monte Carlo (MC) calculations including a magnetic field induced by the spectator protons. These observations point to a large nonCME contribution to the correlator. Furthermore, the charge dependence of gamma(alpha beta) can be described by a blast wave model calculation that incorporates background effects and by the Anomalous Viscous Fluid Dynamics model with values of the CME signal consistent with zero. The Xe-Xe and Pb-Pb results are combined with the expected CME signal dependence on the system size from the MC calculations including a magnetic field to obtain the fraction of CME contribution in gamma(alpha beta), f(CME). The CME fraction is compatible with zero for the 30% most central events in both systems and then becomes positive. This yields an upper limit of 2% (3%) and 25% (32%) at 95% (99.7%) confidence level for the CME signal contribution to gamma(alpha beta) in the 0-70% Xe-Xe and Pb-Pb collisions, respectively.

Název v anglickém jazyce

Search for the Chiral Magnetic Effect with charge-dependent azimuthal correlations in Xe-Xe collisions at root SNN=5.44 TeV

Popis výsledku anglicky

Charge-dependent two- and three-particle correlations measured in Xe-Xe collisions at root S-NN = 5.44 TeV are presented. Results are obtained for charged particles in the pseudorapidity range |eta| < 0.8 and transverse momentum interval 0.2 <= p(T) < 5.0 GeV/c for different collision centralities. The three-particle correlator gamma(alpha beta)=< cos(phi(alpha) +phi(beta) - 2 psi(2))>, calculated for different combinations of charge sign alpha and beta, is expected to be sensitive to the presence of the Chiral Magnetic Effect (CME). Its magnitude is similar to the one observed in Pb-Pb collisions in contrast to a smaller CME signal in Xe-Xe collisions than in Pb-Pb collisions predicted by Monte Carlo (MC) calculations including a magnetic field induced by the spectator protons. These observations point to a large nonCME contribution to the correlator. Furthermore, the charge dependence of gamma(alpha beta) can be described by a blast wave model calculation that incorporates background effects and by the Anomalous Viscous Fluid Dynamics model with values of the CME signal consistent with zero. The Xe-Xe and Pb-Pb results are combined with the expected CME signal dependence on the system size from the MC calculations including a magnetic field to obtain the fraction of CME contribution in gamma(alpha beta), f(CME). The CME fraction is compatible with zero for the 30% most central events in both systems and then becomes positive. This yields an upper limit of 2% (3%) and 25% (32%) at 95% (99.7%) confidence level for the CME signal contribution to gamma(alpha beta) in the 0-70% Xe-Xe and Pb-Pb collisions, respectively.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

<a href="/cs/project/LM2018104" target="_blank" >LM2018104: Výzkumná infrastruktura pro experimenty v CERN</a><br>

Návaznosti

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

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

856

Číslo periodika v rámci svazku

Sep

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

14

Strana od-do

—

Kód UT WoS článku

001346025700001

EID výsledku v databázi Scopus

2-s2.0-85198726626