Two-Loop Threshold Singularities, Unstable Particles and Complex Masses

Details Two-Loop Threshold Singularities, Unstable Particles and Complex Masses Two-Loop Threshold Singularities, Unstable Particles and Complex Masses

2008-09-08

arxiv.org/abs/0809.1302v1

Phys.Lett.B669:62-68,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 12 pages, 7 figures

Scientific paper

10.1016/j.physletb.2008.09.028

The effect of threshold singularities induced by unstable particles on two-loop observables is investigated and it is shown how to cure them working in the complex-mass scheme. The impact on radiative corrections around thresholds is thoroughly analyzed and shown to be relevant for two selected LHC and ILC applications: Higgs production via gluon fusion and decay into two photons at two loops in the Standard Model. Concerning Higgs production, it is essential to understand possible sources of large corrections in addition to the well-known QCD effects. It is shown that NLO electroweak corrections can incongruently reach a 10 % level around the WW vector-boson threshold without a complete implementation of the complex-mass scheme in the two-loop calculation.

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