New phenomenological and theoretical perspective on anomalous ZZ and Zγ processes

2018/06/25 by Brando Bellazzini, Francesco Riva · 70 citations
Mathematics · Physics and Astronomy · #Cosmology and Gravitation Theories #Geometry #Mathematics #Particle physics theoretical and experimental studies #Perspective (graphical) #Statistical Mechanics and Entropy #hep-ph

paper · pdf · doi:10.1103/physrevd.98.095021

published in Physical review. D/Physical review. D. 98(9) (American Physical Society) · 7 pages, 2 figures

arxiv created 2018/06/25 · openalex created_date 2018/07/10 · openalex publication_date 2018/11/26 · arxiv updated 2018/12/05 · openalex updated_date 2026/08/06

Abstract

Neutral diboson processes are precise probes of the Standard Model (SM) of particle physics, which entails high sensitivity to new physics effects. We identify in terms of dimension-8 effective operators the leading departures from the SM that survive in neutral diboson processes at high energy and that interfere with the unsuppressed SM helicity contributions. We describe symmetries and selection rules that single out those operators, both for weakly and strongly coupled physics beyond the SM. Finally, we show that unitarity and causality enforce, via dispersion relations, positivity constraints on the coefficients of these effective operators, reducing the parameter space which is theoretically allowed.

Citations

• Remarks on analyticity and unitarity in the presence of a strongly interacting light Higgs
• Kaluza-Klein states from large extra dimensions
• Dispersion relation bounds forππscattering
• A basis of dimension-eight operators for anomalous neutral triple gauge boson interactions
• Theoretical constraints on the Higgs effective couplings
• Evaluation of the derivative quartic terms of the meson chiral Lagrangian from forward dispersion relations
• Causality, Analyticity and an IR Obstruction to UV Completion

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