Re-examining the premise of isobaric collisions and a novel method to measure the chiral magnetic effect

TL;DR

This paper challenges the assumptions behind isobaric collision experiments for detecting the chiral magnetic effect, highlighting uncertainties in nuclear structure and proposing a new, more reliable measurement method using simulations.

Contribution

It reveals large uncertainties in isobaric collision expectations and introduces a novel approach to measure CME contributions within the same system.

Findings

Isobaric collision expectations may not hold due to nuclear structure uncertainties.

Proposed a new method to gauge CME and background within the same system.

Validated the method with Monte Carlo Glauber and AMPT simulations.

Abstract

In this proceeding we will show that the expectations of the isobaric $^{96}_{44}\mathrm{Ru}+^{96}_{44}\mathrm{Ru}$ and $^{96}_{40}\mathrm{Zr}+^{96}_{40}\mathrm{Zr}$ collisions on chiral magnetic effect (CME) search may not hold as originally anticipated due to large uncertainties in the isobaric nuclear structures. We demonstrate this using Woods-Saxon densities and the proton and neutron densities calculated by the density functional theory. Furthermore, a novel method is proposed to gauge background and possible CME contributions in the same system, intrinsically better than the isobaric collisions of two different systems. We illustrate the method with Monte Carlo Glauber and AMPT (A Multi-Phase Transport) simulations.