Search for CME in U+U and Au+Au collisions in STAR with different approaches of handling backgrounds

The chiral magnetic effect (CME) refers to charge separation along a strong field between left- and right-handed quarks, caused by interactions with topological gluon fields from QCD vacuum fluctuations. We present two approaches handle the dominant elliptic flow (v2) background in three-particle correlator (Δγ112), sensitive CME. In first approach, we Δγ112 Δγ123 measurements U+U Au+Au collisions. While hydrodynamic simulations including resonance decays local conservation predict that scaled Npart/ν2 will be similar collisions, projected B-field exhibits distinct difference systems varying Npart. Therefore, collisions provide configurations different expectations for both CME signal background. Moreover, observable Npart/ν3 baseline measurement only second ν2 measuring respect planes of spectators measured Zero Degree Calorimeters participants Time Projection Chamber. These contain amounts contributions (along B-field, due spectators) (determined participant geometry). With measurements, possible contribution can determined. report such at sNN=27GeV newly installed event plane detector, new findings system where spectator-participant correlations are expected differ those