Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of two narrow mesons in the D+_s pi^0 and D+_s pi^0 gamma
  final states. Results from BaBar, Belle and CLEO   The BaBar experiment has discovered a narrow state, denoted as
D*_{sJ}(2317)+, near 2.32 GeV/c^2 in the D+s pi^0 invariant mass distribution
from inclusive $e^{+}e^{-}$ interactions at center-of-mass energies near 10.6
GeV. The same experiment has hinted the presence of a second new state near
2.46 GeV/c^2 in the D+_s pi^0 gamma mass spectrum. These discoveries have
triggered CLEO and Belle experiments in their own search for new states coupled
to D+_s meson. They have confirmed the existence of the D*_{sJ}(2317)^+ state
and established the evidence for the second state denoted as D*_{sJ}(2458)^+.
Belle has reported evidence for both states not only in continuum e+e-
annihilations but also in B decays. These two new narrow resonances are
characterized by masses significantly lower than predicted by potential models
and enough to close off the most natural decay modes, thus forcing
isospin-violating transitions. Their discovery has been a surprise because it
contradicts the expectations of apparently established theory. This
circumstance has led to a great effort on theoretical side as well.

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The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg