Speaker
Description
In the early stages of heavy-ion collisions, the produced matter forms a high-density gluon system known as the glasma, which is simulated using classical fields based on the Color Glass Condensate (CGC) framework. Recently, significant progress has been reported by many groups in advancing glasma simulations, extending them to three-dimensional models that incorporate the longitudinal structure of the glasma, which had not been considered previously.
In this study, we employ the 3+1D glasma simulation method that we recently developed to analyze the three-dimensional geometry of the glasma in Au-Au collisions at $\sqrt{s_{\rm NN}}=200$ GeV. The geometry is found to be sensitive to the impact parameter, and as a result, the intriguing impact-parameter dependence of various observables is observed.
We show the 3D geometry of the glasma and an analysis of geometry-dependent observables such as eccentricity, angular momentum, and vorticity. An increase is observed in these observables with larger impact parameters. Interestingly, while angular momentum also grows with impact parameter, its production at mid-rapidity is significantly suppressed for all impact parameter values. We discuss this suppression by comparing it with experimental findings of global polarization (in press in Physical Review D).
