Primary observables for gauge boson collider signals

Journal Article · 28 April 2024 · Physical Review. D.

DOI: https://doi.org/10.1103/PhysRevD.109.075046 · OSTI ID:2341701

Arzate, Cristien ; Chang, Spencer; Jacobo, Gabriel

In this paper, we determine a basis for the on-shell four-point amplitudes $VVVV$ for Standard Model gauge bosons $V=W^{\pm },Z,\gamma ,g$ . Following previous work, this completes the analysis of three- and four-point amplitudes for the Standard Model and could be used for model-independent searches for beyond the Standard Model physics at colliders. Our results include a Lagrangian parametrization for the “primary” amplitudes, where including additional derivatives leads to the Mandelstam “descendant” amplitudes, and upper bounds on the coupling constants from imposing unitarity. We also perform an estimate for the sensitivity for new $Z$ decays at the High-Luminosity LHC, finding that $Z\to \gamma \overline{\ell }\ell$ could be searched for, but that other decay modes, like $Z\to (\gamma \gamma \gamma ,\gamma gg)$ , are too small to be discovered after imposing unitarity constraints. Published by the American Physical Society 2024

• Sponsoring Organization: USDOE
• Grant/Contract Number: SC0011640
• OSTI ID: 2341701
• Journal Information: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 7 Vol. 109; ISSN PRVDAQ; ISSN 2470-0010
• Publisher: American Physical SocietyCopyright Statement
• Country of Publication: United States
• Language: English