Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Emergence of the rho resonance from the HAL QCD potential   In this article, we report the $\rho$ resonance study using the HAL QCD
method. We calculate the $I=1$ $\pi \pi$ potential at $m_{\pi} \approx 0.41$
GeV by a combination of the one-end trick, sequential propagator and covariant
approximation averaging (CAA). Thanks to those techniques, we determine the
non-local $I=1$ $\pi \pi$ potential at the next-to-next-to-leading order
(N$^2$LO) of the derivative expansion for the first time and obtain the pole of
the S-matrix corresponding to the $\rho$ resonance. We also discuss the
comparison between our result and a previous calculation, done by L\"uscher's
method.

17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph