Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modifying the Dyson Series for Unstable Particles and Resonances   In this work, we introduce a modification of the Dyson series based on the
perturbative unitarity as a starting point. The presented approach
systematically avoids singularities and double-counting related to the presence
of unstable particles as intermediate states and, at the same time, it does not
rely on a specific choice of the renormalization scheme.

35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess