### Speaker

### Description

Fluctuations of event-wise average transverse momentum ($[p_\mathrm{T}]$)

and the harmonic flow ($v_n$) carry important information

about initial-state geometry.

Collisions of nuclei with large quadrapole deformation are predicted

to produce an initial state with enhanced shape and size fluctuations,

and result in non-trivial correlation between $v_n$ and $[p_\mathrm{T}]$

in the final state.

In particular, the $v_2-[p_\mathrm{T}]$ correlations are predicted to be

different between collisions of spherical $^{208}$Pb and collisions of

deformed $^{129}$Xe.

This poster presents new measurement of $v_n-[p_\mathrm{T}]$ correlation in

$\sqrt{s_{\mathrm{NN}}}=5.44$~TeV Xe+Xe collisions and compared with

Pb+Pb at $\sqrt{s_{\mathrm{NN}}}=5.02$~TeV for harmonics $n=2$, 3 and 4.

The correlation strength is found to depend strongly on centrality and

also on the choice of transverse momentum range of the particles

for all harmonics.

Comparison with theoretical model calculations are used to shed light on

the system-size dependence of this correlation and the influence of deformations.

This measurement provides inputs for better understanding of the

initial-state nuclear geometry and dynamics of heavy ion collisions.