Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Dispersive Approach to Electroweak Processes in the Background
  Magnetic Field   We propose a new method to compute amplitudes of electroweak processes in the
strong background magnetic field, using $\gamma\to e^+e^-$ as an example. We
show that the {\it moments} of $\gamma\to e^+e^-$ width are proportional to the
derivatives of photon polarization function at the zero energy. Hence, the
pair-production width can be easily calculated from the latter by the inverse
Mellin transform. The prospects of our approach are commented.

21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an