Description
The structure of atomic nuclei can be 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) and the radial flow blast. We present a direct measurement of 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 moments defined by both strength $\beta_2$, and triaxiality $\gamma$. The results show the higher-order cumulant of transverse momentum fluctuation to have a sensitive response to both $\beta_2$ and $\gamma$.
| Field of study | Quantum Physics |
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| Supervisor | You Zhou |
