Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: QCD Light-Cone Sum Rule Estimate of Charming Penguin Contributions in B
  -> pi pi   Employing the QCD light-cone sum rule approach we calculate the B -> pi pi
hadronic matrix element of the current-current operator with c quarks in the
penguin topology (``charming penguin''). The dominant contribution to the sum
rule is due to the c-quark loop at short distances and is of O(alpha_s) with
respect to the factorizable B -> pi pi amplitude. The effects of soft gluons
are suppressed at least by O(alpha_s m_b^{-2}). Our result indicates that
sizable nonperturbative effects generated by charming penguins at finite m_b
are absent. The same is valid for the penguin contractions of the
current-current operators with light quarks.

9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
2
The categories of this paper are: math