Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Centrality determination in heavy-ion collisions with the LHCb detector   The centrality of heavy-ion collisions is directly related to the medium
created therein. A procedure to determine the centrality of collisions with the
LHCb detector is implemented for lead-lead collisions at
$\sqrt{s_{\scriptscriptstyle\text{NN}}}=5\, \mathrm{TeV}$ and lead-neon
fixed-target collisions at $\sqrt{s_{\scriptscriptstyle\text{NN}}}=69\,
\mathrm{GeV}$. The energy deposits in the electromagnetic calorimeter are used
to determine and define the centrality classes. The correspondence between the
number of participants and the centrality for the lead-lead collisions is in
good agreement with the correspondence found in other experiments, and the
centrality measurements for the lead-neon collisions presented here are the
first performed in fixed-target collisions at the LHC.

4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin