Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the nature of an excited state   In many lattice simulations with dynamical quarks, radial or orbital
excitations of hadrons lie near multihadron thresholds: it makes the extraction
of excited states properties more challenging and can introduce some
systematics difficult to estimate without an explicit computation of
correlators using interpolating fields strongly coupled to multihadronic
states. In a recent study of the strong decay of the first radial excitation of
the $B^*$ meson, this issue has been investigated and we have clues that a
diquark interpolating field $\bar{b} \gamma^i q$ is very weakly coupled to a $B
\pi$ $P$-wave state while the situation is quite different if we consider an
interpolating field of the kind $\bar{b} \nabla^i q$, where $\vec{\nabla}$ is a
covariant derivative: those statements are based on examining the charge
density distribution.

23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th