Search for the Chiral Magnetic Effect with charge-dependent azimuthal correlations in Xe–Xe collisions at √sNN = 5.44 TeV
ALICE Collaboration. (2024). Search for the Chiral Magnetic Effect with charge-dependent azimuthal correlations in Xe–Xe collisions at √sNN = 5.44 TeV. Physics Letters B, 856, Article 138862. https://doi.org/10.1016/j.physletb.2024.138862
Julkaistu sarjassa
Physics Letters BTekijät
Päivämäärä
2024Tekijänoikeudet
© 2024 The Author(s). Published by Elsevier B.V. Funded by SCOAP³
Charge-dependent two- and three-particle correlations measured in Xe-Xe collisions at √sNN=5.44 TeV are presented. Results are obtained for charged particles in the pseudorapidity range |η|<0.8 and transverse momentum interval 0.2≤pT<5.0 GeV/c for different collision centralities. The three-particle correlator γαβ≡⟨cos(φα+φβ−2Ψ2)⟩, calculated for different combinations of charge sign α and β, 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 non-CME contribution to the correlator. Furthermore, the charge dependence of γαβ 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 γαβ, fCME. The CME fraction is compatible with zero for the 30% most central events in both systems and then becomes positive; averaging over the 0-70% centrality interval yields an upper limit of 2% (3%) and 25% (32%) at 95% (99.7%) confidence level for the CME signal contribution to γαβ in Xe-Xe and Pb-Pb collisions, respectively.
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Julkaisija
ElsevierISSN Hae Julkaisufoorumista
0370-2693Asiasanat
Julkaisu tutkimustietojärjestelmässä
https://converis.jyu.fi/converis/portal/detail/Publication/233342308
Metadata
Näytä kaikki kuvailutiedotKokoelmat
Rahoittaja(t)
Suomen AkatemiaRahoitusohjelmat(t)
Huippuyksikkörahoitus, SALisätietoja rahoituksesta
Academy of Finland (Center of Excellence in Quark Matter) (grant nos. 346327, 346328), FinlandLisenssi
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