Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charged pion masses under strong magnetic fields in the NJL model   The behavior of charged pion masses in the presence of a static uniform
magnetic field is studied in the framework of the two-flavor NJL model, using a
magnetic field-independent regularization scheme. Analytical calculations are
carried out employing the Ritus eigenfunction method, which allows us to
properly take into account the presence of Schwinger phases in the quark
propagators. Numerical results are obtained for definite model parameters,
comparing the predictions of the model with present lattice QCD results.

37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio