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

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

2006-09-28

arxiv.org/abs/hep-ph/0609300v1

Phys.Rev.lett.97:261804,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 1 figure

Scientific paper

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 non-trivial corrections to the usual flavour 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 six times larger than the B-> K pi one.

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