Search for the Chiral Effect using isobar collisions and BES-II data from STAR

TL;DR

This paper reports on recent high-precision measurements of charge separation differences in isobar collisions and BES-II data, providing insights into the Chiral Magnetic Effect and magnetic field influences in heavy-ion collisions.

Contribution

It presents new experimental results from STAR and RHIC BES-II that refine the understanding of charge separation and magnetic field effects in heavy-ion collisions.

Findings

Charge separation difference is smaller than previously expected.

Magnetic field effects on charge separation are less pronounced.

New measurements constrain the magnitude of the Chiral Magnetic Effect.

Abstract

In these proceedings we discuss the recent precision measurements of charge separation difference between Ru+Ru and Zr+Zr collisions at $\sqrt{s_{\rm NN}}=200$ GeV by STAR collaboration. The measurements indicate that the magnitude of the difference in the charge separation attributable to the magnetic fields between the two systems is smaller than previously expected. We also present charge separation measurements on the Chiral Magnetic Effect search from the RHIC BES-II experiment using the Event Plane Detectors (EPD) from Au+Au collisions at $\sqrt{s_{\rm NN}} =$ 27 GeV.