Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effective field theories for quantum chromo- and electrodynamics   In this dissertation, I introduce the principles and methods of effective
field theory and describe my work in three EFTs: First, in the perturbative QCD
region, I use soft collinear effective theory (SCET) to prove that strong
interaction soft radiation is universal and to increase the QCD accuracy to
next-to-next-tonext- to leading logarithm order for new particle searches in
hadron colliders. I also compute a new class of non-perturbative, large
logarithmic enhancement arising near the elastic limits of deep inelastic
scattering and Drell-Yan processes. Second, in the QCD confinement region, I
use heavy hadron chiral perturbation theory to study near-threshold
enhancements in the scattering of $D$ and $\pi$ mesons near the threshold for
the excited $D$-meson state, $D^*$, as well as in the scattering of $D$ and
$D^*$ mesons near the threshold for the exotic hadron X(3872). This work
provides a clear picture of the hadronic molecule X(3872) and more profound
understanding of the nuclear force between hadrons. Finally, inspired by SCET,
I construct a new electron-laser effective field theory to describe
highly-relativistic electrons traveling in strong laser fields, extract the
universal distribution of electrons in strong electromagnetic backgrounds and
its evolution in energy from the separated momentum scales of emitted photons
and classical radiation, and predict the rate of wide angle photon emission. I
conclude with limitations of EFT methods and some perspectives on what new work
may be achieved with these EFTs.

17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics