Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Characterizing the initial conditions of heavy-ion collisions at the LHC
  with mean transverse momentum and anisotropic flow correlations   Correlations between mean transverse momentum $[p_{\rm T}]$ and anisotropic
flow coefficients $v_{\rm 2}$ or $v_{\rm 3}$ are measured as a function of
centrality in Pb-Pb and Xe-Xe collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV and
5.44 TeV, respectively, with ALICE. In addition, the recently proposed
higher-order correlation between $[p_{\rm T}]$, $v_{\rm 2}$, and $v_{\rm 3}$ is
measured for the first time, which shows an anticorrelation for the presented
centrality ranges. These measurements are compared with hydrodynamic
calculations using IP-Glasma and $\rm T_{R}ENTo$ initial-state shapes, the
former based on the Color Glass Condensate effective theory with gluon
saturation, and the latter a parameterized model with nucleons as the relevant
degrees of freedom. The data are better described by the IP-Glasma rather than
the $\rm T_{R}ENTo$ based calculations. In particular, Trajectum and JETSCAPE
predictions, both based on the $\rm T_{R}ENTo$ initial state model but with
different parameter settings, fail to describe the measurements. As the
correlations between $[p_{\rm T}]$ and $v_{\rm n}$ are mainly driven by the
correlations of the size and the shape of the system in the initial state,
these new studies pave a novel way to characterize the initial state in
relativistic heavy-ion collisions.

7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio