Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct CP Violation in K_L --> \pi^0 e^+e^- Beyond Leading Logarithms   We analyze the direct CP violation in the rare decay K_L --> Pi^0 e+e- with
QCD effects taken into account consistently in the next-to-leading order. We
calculate the two-loop mixing between the four-quark \Delta S=1 operators and
the operator Q_7V = (sd)_(V-A)(ee)_V in the NDR and HV renormalization schemes.
Using the known two-loop anomalous dimension matrix of the four-quark
operators, we find that the coefficient C_7V(\mu) depends only very weakly on
\mu, renormalization scheme and \Lambda_MSbar. The next-to-leading QCD
corrections enhance the direct CP violating contribution over its leading order
estimate so that it remains dominant in spite of the recent decrease of
|V_ub/V_cb| and |V_cb|. We expect typically BR(K_L --> \pi^0 e^+ e^-)_dir ~
6*10^(-12), although values as high as 10^(-11) are not yet excluded.

24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs