Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charge-odd directed flows in heavy-ion collisions by Boltzmann-Maxwell
  equations   We have calculated the directed flow $v_{1}$ and charge-odd directed flow
$\Delta v_{1}$ for pions and protons in Au+Au collisions at
$\sqrt{s_{NN}}=200$GeV by solving the coupled Boltzmann-Maxwell equations
self-consistently. Our numerical results show that $v_{1}$ for pions and
protons are all negative and have similar behavior and magnitude. In contrast
we find a quite different behavior in $\Delta v_{1}$ for pions and protons. The
difference lies in that $\Delta v_{1}$ for protons mainly comes from pressure
gradients of the medium, while the dominant contribution to $\Delta v_{1}$ for
pions is from electromagnetic fields. Our results indicate that the effect of
the electric field will slightly exceed that of the magnetic and lead to a
small negative slope of $\Delta v_{1}$ for pions. Our numerical results are
consistent with experimental data and solve the sign puzzle in $\Delta v_{1}$
for pions and protons in previous studies.

27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio