Abstract
We present low-energy theorems for the calculation of loop amplitudes with external scalar or pseudoscalar Higgs bosons which are light compared to the loop particles. Starting from existing lowest-order versions of these theorems, we show how their applicability may be extended to the two-loop level. To illustrate the usefulness of these theorems, we discuss a number of applications to Higgs production and decay at and beyond the one-loop order.
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Supported by Bundesministerium für Bildung und Forschung (BMBF), Bonn, Germany, under Contract 05 6 HH 93P (5) and by EU ProgramHuman Capital and Mobility through NetworkPhysics at High Energy Colliders under Contract CHRX-CT93-0357 (DG12 COMA)
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Kniehl, B.A., Spira, M. Low-energy theorems in Higgs physics. Z. Phys. C - Particles and Fields 69, 77–87 (1995). https://doi.org/10.1007/s002880050007
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DOI: https://doi.org/10.1007/s002880050007