Search for the chiral magnetic effect through beam energy dependence of charge separation using event shape selection

STAR-RHIC. Search for the chiral magnetic effect in RHIC Au+Au data from Beam Energy Scan II and at 200 GeV. The CME charge separation is oberserved with $\Delta\gamma^{112}$ and compared to the background indicator $\Delta\gamma^{132}$ before and after the Event Shape Selection method to suppress its elliptic flow background. The background indicator $\Delta\gamma^{132}_{ESS}$ is found to be consistent with zero across energies and cenratlity regions, validating the flow background suppression. The CME observable is found to be around 3$\sigma$ significance in 20--50\% centrality in Au+Au collisons at 11.5, 14.6 and 19.6 GeV, with a rise-and-fall trend acorss the beam energy.