Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effective theory calculation of resonant high-energy scattering   Tests of the standard model and its hypothetical extensions require precise
theoretical predictions for processes involving massive, unstable particles. It
is well-known that ordinary weak-coupling perturbation theory breaks down due
to intermediate singular propagators. Various pragmatic approaches have been
developed to deal with this difficulty. In this paper we construct an effective
field theory for resonant processes utilizing the hierarchy of scales between
the mass of the unstable particle, M, and its width, Gamma. The effective
theory allows calculations to be systematically arranged into a series in g^2
and Gamma/M, and preserves gauge invariance in every step. We demonstrate the
applicability of this method by calculating explicitly the inclusive line shape
of a scalar resonance in an abelian gauge-Yukawa model at next-to-leading order
in Gamma/M and the weak couplings. We also discuss the extension to
next-to-next-to-leading order and compute an interesting subset of these
corrections.

19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin