Exploring Longitudinal Observables with 3+1D IP-Glasma

Abstract

We present a formulation of the initial state of heavy ion collisions that generalizes the 2+1D boost invariant IP-Glasma \cite{Schenke:2012wb} to 3+1D through JIMWLK rapidity evolution of the pre-collision Wilson lines. The rapidity dependence introduced by the JIMWLK evolution leads us to modify the initial condition for the gauge fields, and to solve Gauss' law iteratively in order to allow for temporal evolution on a 3-dimensional lattice. While the transverse physics of QGP has been studied nearly exhaustively, the effect of longitudinal fluctuations introduced by the JIMWLK evolution has yet to be studied in detail phenomenologically. Hence, we couple our 3+1D IP-Glasma model to MUSIC+UrQMD, for completely 3+1D simulations of heavy ion collisions. Specifically, we consider Pb-Pb collisions at $\sqrt{s}=2.76\mathrm{TeV}$ and study the rapidity dependence of the charged hadron $v_n(\eta )$ via the $\eta$-dependent flow factorization ratios $r_n({\eta }_a,{\eta }_b)$ as measured by CMS \cite{Khachatryan:2015oea}, as well as the charged hadron multiplicity $d{N}_{ch}/d\eta$.

arXiv commentSubmitted as a proceeding for Quark Matter 2019, held in Wuhan, China. 4 pages, 3 figures

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• 3-D structure of the Glasma initial state -- Breaking boost-invariance by collisions of extended shock waves in classical Yang-Mills theory
• The energy-momentum tensor at the earliest stage of relativistic heavy ion collisions
• Energy-momentum tensor of the dilute (3+1)D Glasma
• The BEST framework for the search for the QCD critical point and the chiral magnetic effect
• The quest for the quark-gluon plasma from the perspective of dynamical models of relativistic heavy-ion collisions