Higher-Order Corrections to QCD Factorization in B->pi K,pi pi Decays

Details Higher-Order Corrections to QCD Factorization in B->pi K,pi pi Decays Higher-Order Corrections to QCD Factorization in B->pi K,pi pi Decays

2002-02-14

arxiv.org/abs/hep-ph/0202128v2

JHEP 0202 (2002) 028

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, 2 figures, journal version published in JHEP

Scientific paper

10.1088/1126-6708/2002/02/028

The renormalon calculus is used to calculate the terms of order $\beta_0^{n-1}\alpha_s^n$ in the perturbative expansions of the Wilson coefficients and hard-scattering kernels entering the QCD factorization formula for hadronic B-meson decays into two light pseudoscalar mesons. The asymptotic behavior of the expansions is analyzed, and a minimal model of power corrections arising from soft ``non-factorizable'' gluon exchange to the B->pi K,pi pi decay amplitudes is obtained, which takes into account the structure of the leading and subleading infrared renormalon singularities. Whereas the resulting power corrections are generally very small, some of the strong-interaction phases of the hard-scattering kernels receive sizeable two-loop corrections. The implications of these findings on CP asymmetries and branching ratios are investigated.

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