Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Intermediate psuedoscalar resonance contributions to B->X_s photon
  photon   We calculate the decay rate B-> X_s photon photon via intermediate
psuedoscalar charmonium eta_c. This process is thought to be the main
long-distance contribution which dominates the corresponding inclusive rare B
decay. We point out that once the momentum dependence of eta_c-> photon photon
conversion strength, due to off-shellness of the intermediate eta_c, is taken
into account, the rate of this decay mode is reduced. The change in
differential decay rate in region of spectrum immediately below m_{eta_c} is
more significant. On the other hand, we point out that the unexpectedly large
branching ratio for B-> X_s eta' which is recently observed by CLEO could
indicate a potentially larger long-distance contribution via eta' resonance.

17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics