Penguin Contractions and Factorization in B -> K pi Decays

Details Penguin Contractions and Factorization in B -> K pi Decays Penguin Contractions and Factorization in B -> K pi Decays

2001-04-02

arxiv.org/abs/hep-ph/0104018v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 3 figures. Talk given by L. Silvestrini at BCP4, Ise-Shima, Japan, 18-23 Feb 2001

Scientific paper

We study Lambda_{QCD}/m_B corrections to factorization in B -> K pi decays. First, we analyze these decay channels within factorization, showing that, irrespectively of the value of gamma, it is not possible to reproduce the experimental data. Then, we discuss Lambda_{QCD}/m_B corrections to these processes, and argue that there is a class of doubly Cabibbo enhanced non-factorizable contributions, usually called charming penguins, that cannot be neglected. Including these corrections, we obtain an excellent agreement with experimental data. Furthermore, contrary to what is obtained with factorization, we predict sizable rate asymmetries in B^\pm -> K^\pm \pi^0 and B -> K^\pm pi^\mp.

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