Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Higgs boson decay into two photons in an electromagnetic background   The amplitude for Higgs boson decay into two photons in a homogeneous and
time-independent magnetic field is investigated by proper-time regularization
in a gauge invariant manner and is found to be singular at large field values.
The singularity is caused by the component of the charged vector boson field
that is tachyonic in a strong magnetic field. Also tools for the computation of
the amplitude in a more general electromagnetic background are developed.

9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph