Jul 16 – 22, 2009
Kraków, Poland
Europe/Warsaw timezone

Resolution of the B -> pi pi, pi K puzzles

Jul 16, 2009, 11:15 AM
Large Lecture - Hall A (Kraków, Poland)

Large Lecture - Hall A

Kraków, Poland

The Auditorium Maximum of the Jagiellonian University 33 Krupnicza Street 31-123 Kraków
Flavour Physics II. Flavour Physics


Dr Satoshi Mishima (DESY)


We show that there exist uncanceled soft divergences in the k_T factorization for nonfactorizable amplitudes of two-body nonleptonic B meson decays, similar to those identified in hadron-hadron collisions. Viewing the special role of the pion as a q-qbar bound state and as a pseudo Nambu-Goldstone boson, we associate a soft factor with it in the perturbative QCD formalism. This soft factor enhances the nonfactorizable color-suppressed tree amplitudes, such that the branching ratios B(B->pi^0 pi^0) and B(B->pi^0 rho^0) are increased under the constraint of the B(B->rho^0 rho^0) data, the difference between the direct CP asymmetries A_{CP}(B->pi^\mp K^\pm) and A_{CP}(B->pi^0 K^\pm) is enlarged, and the mixing-induced CP asymmetry S_{pi^0 K_S} is reduced. That is, the known B->pi pi and B->pi K puzzles can be resolved simultaneously.

Primary author


Prof. Hsiang-nan Li (Academia Sinica, Taiwan)

Presentation materials