Results on charge correlations with respect to the reaction plane from STAR

The quantum fluctuations in the early stages of relativistic heavy ion collisions amidst strong electromagnetic fields can lead to violation of local P and CP symmetries of strong interaction. As a consequence of such extreme conditions one expects to observe novel phenomena such as the Chiral Magnetic Effect (CME). Previous measurements of the CME remain inconclusive because of large background contributions. In order to better control the influence of signal and backgrounds, the STAR collaboration has recently performed a blind analysis on a large data sample of approximately 3.8 billion isobar Ru+Ru and Zr+Zr collisions at the center of mass energy of 200 GeV at the Relativistic Heavy Ion Collider. In this talk I will briefly introduce the history of the CME search in HICs and discuss the findings from the isobar blind analysis. With the CME search narrowed down by the isobar program, where do we go from here? Several promising directions have been identified. High statistics data from the second phase of RHIC beam energy scan program and new detector upgrades of STAR provide a unique opportunity for CME search at low energy collisions. Also, the anticipated run of RHIC in the year 2023-25 with novel analysis techniques provide an opportunity to extract upper limits on the observability in Au+Au collisions. I will briefly review these initiatives in the context of future CME search in heavy ion collisions. 

Reference:

[1] M. Abdallah et al. (STAR Collaboration), (2021), arXiv:2109.00131 [nucl-ex], https://arxiv.org/abs/2109.00131