The VII-th International Conference on the Initial Stages of High-Energy Nuclear Collisions : Initial Stages 2023

Probing nuclear deformation in ultra-relitivistic collisions with higher order cumulants of transverse momentum fluctuations

Not scheduled

2h

Københavns Universitetsbibliotek Nord

Poster The initial stages and nuclear structure in heavy-ion collisions Reception and poster session

Speaker

Frederik Sebastian Jensen (University of Copenhagen (DK))

Description

The shape of atomic nuclei is described by a multipole expansion of the parton distribution function. Most nuclies generally have intrinsic deformation, where the quadrupole moment carries the most significant contribution. The shape of a quadrupole deformed nuclies is described by the deformation strength ${\beta }_2$, and an axial symmetry component $\gamma$. In ultra-relativistic heavy-ion collision, the nuclear shape directly affects the energy density of the created Quark-Gluon-Plasmsa (QGP) from where the radial flow blast manifests as final state energy fluctuations. We present a direct measurement of higher-order cumulants of transverse momentum fluctuation as a fine probe for accessing initial stage properties of deformed nuclies. Using the AMPT model Xe-Xe collisions at $\sqrt{s_{NN}}=5.44$TeV are simulated with different quadrupole shapes defined by both strength ${\beta }_2$, and triaxiality $\gamma$. The results show the higher-order cumulant of transverse momentum fluctuation to not only be a complex function of centrality but also a sensitive response to both ${\beta }_2$ and $\gamma$.

Presentation materials

PtFluctuationsInAMPTCalculationsOfDeformedNuclei.pdf