Search for the chiral magnetic wave using anisotropic flow of identified particles at energies available at the BNL Relativistic Heavy Ion Collider

Authors

STAR Collaboration

Abstract

The chiral magnetic wave (CMW) has been theorized to propagate in the deconfined nuclear medium formed in high-energy heavy-ion collisions and to cause a difference in elliptic flow (𝑣2) between negatively and positively charged hadrons. Experimental data consistent with the CMW have been reported by the STAR Collaboration at the Relativistic Heavy Ion Collider (RHIC), based on the charge asymmetry dependence of the pion 𝑣2 from Au +Au collisions at √𝑠𝑁⁢𝑁=27 to 200 GeV. In this comprehensive study, we present the STAR measurements of elliptic flow and triangular flow of charged pions, along with the 𝑣2 of charged kaons and protons, as a function of charge asymmetry in Au +Au collisions at √𝑠𝑁⁢𝑁=27, 39, 62.4, and 200 GeV. The slope parameters extracted from the linear dependence of the 𝑣2 difference on charge asymmetry for different particle species are reported and compared in different centrality intervals. In addition, the slopes of 𝑣2 for charged pions in small systems, i.e., 𝑝+⁢Au and 𝑑+⁢Au at √𝑠𝑁⁢𝑁=200 GeV, are also presented and compared with those in large systems, i.e., Au +Au at √𝑠𝑁⁢𝑁=200 GeV and U +U at 193 GeV. Our results provide new insights for the possible existence of the CMW and further constrain the background contributions in heavy-ion collisions at RHIC energies.

Document Type

Article

Publication Date

2023

Notes/Citation Information

©2023 American Physical Society

Digital Object Identifier (DOI)

https://doi.org/10.1103/PhysRevC.108.014908

Funding Information

We thank the RHIC Operations Group and RCF at BNL, the NERSC Center at LBNL, and the Open Science Grid consortium for providing resources and support. This work was supported in part by the Office of Nuclear Physics within the U.S. DOE Office of Science; the U.S. National Science Foundation; National Natural Science Foundation of China; Chinese Academy of Science; the Ministry of Science and Technology of China and the Chinese Ministry of Education; the Higher Education Sprout Project by Ministry of Education at NCKU; the National Research Foundation of Korea; Czech Science Foundation and Ministry of Education, Youth and Sports of the Czech Republic; Hungarian National Research, Development and Innovation Office; New National Excellency Programme of the Hungarian Ministry of Human Capacities; Department of Atomic Energy and Department of Science and Technology of the Government of India; the National Science Centre and WUT ID-UB of Poland; the Ministry of Science, Education and Sports of the Republic of Croatia; German Bundesministerium für Bildung, Wissenschaft, Forschung and Technologie (BMBF); Helmholtz Association; Ministry of Education, Culture, Sports, Science, and Technology (MEXT); and Japan Society for the Promotion of Science (JSPS).

Repository Citation

STAR Collaboration, "Search for the chiral magnetic wave using anisotropic flow of identified particles at energies available at the BNL Relativistic Heavy Ion Collider" (2023). Physics and Astronomy Faculty Publications. 721.
https://uknowledge.uky.edu/physastron_facpub/721