Automated predictions from polarized matrix elements
Journal article, 2020

The anticipated experimental resolution and data cache of the High Luminosity Large Hadron Collider will enable precision investigations of polarization in multiboson processes. This includes, for the first time, vector boson scattering. To facilitate such studies, we report the automation of polarized matrix element computations in the publicly available Monte Carlo tool suite, MadGraph5_aMC@NLO. This enables scattering and decay simulations involving helicity-polarized asymptotic or intermediate states, preserving both spin-correlation and off-shell effects. As demonstrations of the method, we investigate the leading order production and decay of polarized weak gauge bosons in the process pp→jjWλ+Wλ′−, with helicity eigenstates (λ, λ′) defined in various reference frames. We consider the Standard Model at both O(α4) and O(α2αs2) as well as a benchmark composite Higgs scenario. We report good agreement with polarization studies based on the On-Shell Projection (OSP) technique. Future capabilities are discussed.

Hadron-Hadron scattering (experiments)

Electroweak interaction

Top physics

Beyond Standard Model



Diogo Buarque Franzosi

Chalmers, Physics, Subatomic and Plasma Physics

Olivier Mattelaer

Universite catholique de Louvain

Richard Ruiz

Universite catholique de Louvain

Sujay Shil

Homi Bhabha National Institute

Institute of Physics Bhubaneswar

Journal of High Energy Physics

1126-6708 (ISSN) 1029-8479 (eISSN)

Vol. 2020 4 82

Subject Categories

Physical Sciences



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