Forests, groves and Higgs bosons

Gauge invariance classes in spontaneously broken gauge theories
  • T. OhlEmail author
  • C. Schwinn
theoretical physics


We determine the gauge invariance classes of tree level Feynman diagrams in spontaneously broken gauge theories, providing a proof for the formalism of gauge and flavor flips. We find new gauge invariance classes in theories with a nonlinearly realized scalar sector. In unitarity gauge, the same gauge invariance classes correspond to a decomposition of the scattering amplitude into pieces that satisfy the relevant Ward identities individually. In theories with a linearly realized scalar sector in \(R_\xi\) gauge, no additional non-trivial gauge invariance classes exist compared to the unbroken case.


Gauge Theory Tree Level Feynman Diagram Gauge Invariance Ward Identity 
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Copyright information

© Springer-Verlag Berlin/Heidelberg 2003

Authors and Affiliations

  1. 1.Institut für Theoretische Physik und AstrophysikUniversität Würzburg, Am HublandWürzburgGermany
  2. 2.Institut für KernphysikDarmstadt University of TechnologyDarmstadtGermany

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