  The chiral magnetic effect (CME) refers to charge separation along a strong
magnetic field of single-handed quarks, caused by interactions with topological
gluon fields from QCD vacuum fluctuations. A major background of CME
measurements in heavy-ion collisions comes from resonance decays coupled with
elliptical flow anisotropy. These proceedings present two new studies from STAR
to shed further light on the background issue: (1) small system p+Au and d+Au
collisions where the CME signal is not expected, and (2) pair invariant mass
dependence where resonance peaks can be identified.
