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Journal Article
Penguins with charm and quark–hadron duality
2009
Overview
The integrated branching fraction of the process
B
→
X
s
l
+
l
−
is dominated by resonance background from narrow charmonium states, such as
B
→
X
s
ψ
→
X
s
l
+
l
−
, which exceeds the non-resonant charm-loop contribution by two orders of magnitude. The origin of this fact is discussed in view of the general expectation of quark–hadron duality. The situation in
B
→
X
s
l
+
l
−
is contrasted with charm-penguin amplitudes in two-body hadronic
B
decays of the type
B
→
π
π
, for which it is demonstrated that resonance effects and the potentially non-perturbative
threshold region do not invalidate the standard picture of QCD factorization. This holds irrespective of whether the charm quark is treated as a light or a heavy quark.
Publisher
Springer-Verlag,Springer,Springer Nature B.V
