Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Long Distance Contributions to Penguin Processes $b\rightarrow s\gamma$
  and $b\rightarrow d \gamma$   We consider the long distance contributions to inclusive penguin processes
through processes like $b\rightarrow s V$ and $b\rightarrow d V$ where $V$ are
$^3S_1(c\bar c)$ states $\psi_i$ in the former case and include $\rho$,
$\omega$ for the latter case. We carefully examine vector dominance for $\bar c
c$ states, and conclude that there is a large suppression of $\psi\sim \gamma$
transition when $\psi$ is at $q^2 = 0$. The long distance effects can be at
most 10\% in both the amplitudes for $b\rightarrow s\gamma$ and $b\rightarrow d
\gamma$. Although the long distance contributions are small, the ratio
$BR(b\rightarrow d\gamma)/BR(b \rightarrow s \gamma) = |V_{td}/V_{ts}|^2$ does
not hold due to significant $u$ and $c$ loop contributions to the short
distance $b\rightarrow d\gamma$ amplitudes .

4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin