Anomalous enhancement of a penguin hadronic matrix element in B -> K eta(')

作者：Gerard J M^*; Kou E

来源：Physical Review Letters, 2006, 97(26): 261804.

DOI：10.1103/PhysRevLett.97.261804

We estimate the density matrix element for the pi(0), eta, and eta(') production from the vacuum in the large-N-c limit. As a consequence, we find that the QCD axial anomaly leads to highly nontrivial corrections to the usual flavor SU(3) relations between B-0 -> K-0 pi(0), B-0 -> K-0 eta, and B-0 -> K-0 eta(') decay amplitudes. These corrections may explain why the B -> K eta(') branching ratio is about 6 times larger than the B -> K pi one.

• 出版日期2006-12-31