Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Turning up and down strong magnetic fields in relativistic nuclear
  collisions   I show that the average transverse momentum, $\langle p_t \rangle$, of the
hadrons emitted in relativistic nuclear collisions can be used as a ``knob'' to
control the strength of the magnetic field induced by the spectator and the
participant protons over the overlap region. I thus argue that any observable
sensitive to this magnetic field is nontrivially correlated with $\langle p_t
\rangle$ at a given collision centrality.

33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an