Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: One pion exchange and the quantum numbers of the Pc(4440) and Pc(4457)
  pentaquarks   The LHCb collaboration has recently discovered three pentaquark-like states
--- the $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$ --- close to the $\bar{D}
\Sigma_c$ and the $\bar{D}^* \Sigma_c$ meson-baryon thresholds. The standard
interpretation is that they are heavy antimeson-baryon molecules. Their quantum
numbers have not been determined yet, which implies two possibilities for the
$P_c(4440)$ and $P_c(4457)$: $J^P = \tfrac{1}{2}^{-}$ and $J^P =
\tfrac{3}{2}^{-}$. The preferred interpretation within a contact-range
effective field theory is that the $P_c(4440)$ is the $J^P = \tfrac{1}{2}^-$
molecule, while the $P_c(4457)$ is the $J^P = \tfrac{3}{2}^-$ one. Here we show
that when the one pion exchange potential between the heavy-antimeson and
heavy-baryon is taken into account, this conclusion changes, with the contrary
identification being as likely as the original one. The identification is
however cutoff dependent, which suggests that improvements of the present
description (e.g. the inclusion of subleading order corrections, like two-pion
exchanges) are necessary in order to disambiguate the spectroscopy of the
molecular pentaquarks.

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The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph