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April 22, 20260 citations

Search for the chiral magnetic wave at STAR with isobar (Ru/Zr) and Au+Au collisions

Key Points

The research aims to examine the energy dependence of the chiral magnetic wave observable in Au+Au collisions.
Analyzed higher statistics data from BES-II at various energies.
Compared results from participant and spectator event planes.
Calculated covariance of elliptic flow to quantify chiral magnetic wave strength.
Observed differences in CMW strength between charged particle types.
Identified a notable enhancement of CMW signal in Ru+Ru collisions compared to Zr+Zr at 200 GeV.
Provided detailed breakdown of elliptic flow contributions in the CMW observable.

Abstract

We present the energy dependence of the Chiral Magnetic Wave (CMW) observable in Au+Au collisions from the BES-II higher statistics data at √sNN = 7.7, 19.6, 19.6, 27 and 200 GeV. The results from participant and spectator event planes are compared to investigate the elliptic flow background in the CMW observable. The normalized difference between positive and negative charged particles of the covariance between vn and Ach which quantifies the CMW strength for v2 (signal + background) and v3 (background only), are presented in Au+Au collisions at 200 GeV. In addition, we report a search for the expected enhancement of the CMW signal in 4496Ru + 4496Ru collisions compared with 4496Zr + 4496Zr collisions at 200 GeV.

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