Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exclusive Hadronic D Decays to $\eta'$ or $\eta$: Addendum on Resonant
  Final-State Interactions   For hadronic two-body decays of charmed mesons involving $\eta$ or $\eta'$,
resonance-induced final-state interactions (FSI) that mimic the W-exchange or
the W-annihilation topology can play an essential role. In particular, the
decays $D^0\to\bar K^0\eta'$ and $D^+\to\pi^+\eta$, which are largely
suppressed in the absence of FSI, are enhanced dramatically by resonant FSI. It
is stressed that the effect of resonant FSI is negligible for
$\rho^+(\eta,\eta')$ final states because of the mismatch of the G parity of
$\rho^+(\eta,\eta')$ and the J=0, I=1 meson resonance. We argue that a possible
gluon-mediated process in which two gluons couple directly to the gluonic
component of the $\eta'$, e.g. the gluonium, rather than to the flavor-singlet
$\eta_0$, can enhance both modes $D_s^+\to\rho^+\eta'$ and
$D_s^+\to\rho^+\eta$, especially the former; that is, this new mechanism can
account for the unexpectedly large branching ratio of $\rho^+\eta'$ without
suppressing $\rho^+\eta$.

13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
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The categories of this paper are: eess
6
The categories of this paper are: astro-ph