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| + | ====== TTP08-42 NNLO Computational Techniques: the Case $H \to \gamma\gamma, | ||
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| + | < | ||
| + | d systematized. The main emphasis of the paper is on the two Standard Model decays H -> gamm | ||
| + | a gamma and H -> g g. The techniques, however, have a much wider range of application: | ||
| + | give practical examples of general rules for two-loop renormalization; | ||
| + | recipes for handling internal unstable particles in two-loop processes; they illustrate sim | ||
| + | ple procedures for the extraction of collinear logarithms from the amplitude. The latter is | ||
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| + | oweak contributions to different physical (pseudo-)observables, | ||
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| + | plied to the process pp -> gg + X -> H + X, the results show that the electroweak scaling fa | ||
| + | ctor for the cross section is between -4 % and + 6 % in the range 100 GeV < Mh < 500 GeV, wi | ||
| + | thout incongruent large effects around the physical electroweak thresholds, thereby showing | ||
| + | that only a complete implementation of the computational scheme keeps two-loop corrections u | ||
| + | nder control. | ||
| + | </ | ||
| + | |**Stefano Actis, Giampiero Passarino, Christian Sturm, Sandro | ||
| + | |** Nucl.Phys. | ||
| + | | {{preprints: | ||
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