Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relativistic chiral description of the $^1S_0$ nucleon-nucleon
  scattering   Recently, a relativistic chiral nucleon-nucleon interaction is formulated up
to leading order which provides a good description of the phase shifts of
$J\leq1$ partial waves [Chin. Phys. C 42 (2018) 014103]. Nevertheless, a
separable regulator function that is not manifestily covariant was used in
solving the relativistic scattering equation. In the present work, we first
propose a covariant and separable form factor to regularize the kernel
potential and then apply it to study the simplest but most challenging $^1S_0$
channel which features several low-energy scales. In addition to being
self-consistent, we show that the resulting relativistic potential can describe
quite well the unique features of the $^1S_0$ channel at leading order, in
particular the pole position of the virtual bound state and the zero amplitude
at the scattering momentum $\sim 340$ MeV, indicating that the relativistic
formulation might be more natural from the point of view of effective field
theories.

33
The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
9
The categories of this paper are: nlin