Two loop QCD anomalous dimensions of flavor changing four quark operators within and beyond the standard model
May, 2000
37 pages
Published in:
- Nucl.Phys.B 586 (2000) 397-426
e-Print:
- hep-ph/0005183 [hep-ph]
Report number:
- TUM-HEP-371-00,
- CERN-TH-2000-124,
- IFT-13-2000,
- TUM-HEP-371/00,
- CERN-TH/2000-124,
- IFT-13/2000
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Abstract:
We calculate the two-loop QCD anomalous dimension matrix (ADM) gamma^(1)_NDR in the NDR-MSbar scheme for all the flavour-changing four-quark dimension-six operators that are relevant in both the Standard Model and its extensions. Both current-current and penguin diagrams are included. Some of our NDR-MSbar results for Delta F=1 operators overlap with the previous calculations, but several others have never been published before. In the case of Delta F=2 operators, our results are compatible with the ones obtained by Ciuchini et al. in the Regularization-Independent renormalization scheme, but differ from their NDR-MSbar results. In order to explain the difference, we calculate the ADM of Delta F=2 operators again, extracting it from the ADM of Delta F=1 operators.Note:
- 40 pages, 1 figure, eq.(4.9) corrected, appendix F added
- quantum chromodynamics: perturbation theory
- current: flavor changing
- regularization: dimensional
- operator: (4quark)
- operator: higher-dimensional
- dependence: renormalization
- operator product expansion
- effective Hamiltonian
- Feynman graph: higher-order
- Feynman graph: penguin
References(0)
Figures(3)
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