Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: eta - eta prime Mixing -From electromagnetic transitions to weak decays
  of charm and beauty hadrons   It has been realized for a long time that knowing the eta and eta^prime wave
functions in terms of quark and gluon components probes our understanding of
non-perturbative QCD dynamics. Great effort has been given to this challenge --
yet no clear picture has emerged even with the most recent KLOE data. We point
out which measurements would be most helpful in arriving at a more definite
conclusion. A better knowledge of these wave functions will significantly help
to disentangle the weight of different decay subprocesses in semi-leptonic
decays of D+, Ds^+ and B+ mesons. The resulting insights will be instrumental
in treating even non-leptonic B transitions involving eta and eta^prime and
their CP asymmetries; thus they can sharpen the case for or against New Physics
intervening there.

13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph