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| — | preprints:2009:ttp09-02 [2016/03/17 11:03] (current) – created - external edit 127.0.0.1 |
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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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