Towards an effective-action approach to fermion-loop corrections

2003/03/31 by W. Beenakker, A. P. Chapovsky, A.P. Chapovsky +4 · 3 citations
Physics and Astronomy · #Action (physics) #Field (mathematics) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Production (economics) #Quantum Chromodynamics and Particle Interactions #Term (time) #Unitarity #hep-ph

paper · pdf · doi:10.1016/s0550-3213(03)00545-5

published as Nucl.Phys. B667 (2003) 359-393 · 43 pages, 1 figure. Accepted for publication in Nuclear Physics B

openalex publication_date 2003/07/22 · arxiv created 2003/08/12 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We present a study of the effective action approach to incorporate higher-order effects in e⁺e^- -> n fermions. In its minimal version, the effective action approach is found to exhibit problems with unitarity and high-energy behaviour. We identify the origin of these problems by investigating the zero-mode solutions of the Ward Identities. A numerical analysis of the importance of the zero-mode solutions is presented for four-fermion production processes.

Cited by

• Electroweak corrections to Wγ and Zγ production at the LHC
• Recursive equations for arbitrary scattering processes
• Effective theory calculation of resonant high-energy scattering