Speaker: T.N. PHAM
Title
Charming penguin in nonleptonic B decays
Abstract
In the study of two-body charmless $B$ decays as a mean of looking for
direct CP-violation and measuring the CKM mixing parameters in the
Standard Model, the short-distance penguin contribution
with its absorptive part generated by charm quark loop
seems capable of producing sufficient $B \rightarrow K\pi$ decays rates, as
obtained in factorization and QCD-improved factorization models. However
there are also long-distance charming penguin contributions which also
give rise to a strong phase due to the rescattering
$D^{*}D^{*} \rightarrow K\pi$ . In this talk, I would like
to discuss a recent work on the long-distance
charming penguin as a
a different approach to the calculation of the penguin contributions
in $B \rightarrow K\pi$ decays from charmed meson
intermediate states. Using chiral effective Lagrangian for light
and heavy mesons, corrected for hard pion and kaon momenta, we show that
the charming-penguin contributions increase significantly the
$B \rightarrow K\pi$ decays rates from its short-distance contributions, giving
results in better agreement with experimental data.
Slides