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We study within the IP-Glasma and two-component MC-Glauber models the effectsof initial state geometry and fluctuations on multiplicities and eccentricitiesfor several collision species at the Relativistic Heavy Ion Collider (RHIC).These include copper-gold (Cu+Au), gold-gold (Au+Au), and uranium-uranium (U+U)collisions. The multiplicity densities per participant pair are very similar inall systems studied. Ellipticities vary strongly between collision systems,most significantly for central collisions, while fluctuation driven odd momentsvary little between systems. Event-by-event distributions of eccentricities inmid-central collisions are wider in Cu+Au relative to Au+Au and U+U systems. Ananti-correlation between multiplicity and eccentricity is observed in ultracentral U+U collisions which is weaker in the IP-Glasma model than thetwo-component MC-Glauber model. In ultra central Au+Au collisions the twomodels predict opposite signs for the slope of this correlation. Measurementsof elliptic flow as a function of multiplicity in such central events cantherefore be used to discriminate between models with qualitatively differentparticle production mechanisms.

Initial state geometry and fluctuations in Au+Au, Cu+Au and U+U collisions at RHIC