# Differences

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+ | ====== TTP09-02 NNLO vertex corrections in charmless hadronic B decays: Real part ====== | ||

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+ | <hidden TTP09-02 NNLO vertex corrections in charmless hadronic B decays: Real part > We compute the real part of the 2-loop vertex corrections for charmless | ||

+ | hadronic B decays, completing the NNLO calculation of the topological | ||

+ | tree amplitudes in QCD factorization. Among the technical aspects we | ||

+ | show that the hard-scattering kernels are free of soft and collinear | ||

+ | infrared divergences at the 2-loop level, which follows after an | ||

+ | intricate subtraction procedure involving evanescent four quark | ||

+ | operators. The numerical impact of the considered corrections is found | ||

+ | to be moderate, whereas the factorization scale dependence of the | ||

+ | topological tree amplitudes is significantly reduced at NNLO. We in | ||

+ | particular do not find an enhancement of the phenomenologically | ||

+ | important ratio |C/T| from the perturbative calculation. | ||

+ | </hidden> | ||

+ | |**Guido Bell** | | ||

+ | |** Nucl.Phys. B822 172-200 2009 ** | | ||

+ | | {{preprints:2009:ttp09-02.pdf|PDF}} {{preprints:2009:ttp09-02.ps|PostScript}} [[http://arxiv.org/abs/0902.1915|arXiv]] | | ||

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