arXiv:1912.01725
CP3-19-52
VBSCan-PUB-09-19
MCnet-19-24
IP/BBSR/2019-10

by: Buarque Franzosi, Diogo (Chalmers U. Tech.) et al.

Abstract:
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 implementation of polarized parton scattering in the publicly available Monte Carlo tool suite, MadGraph5_aMC@NLO. This enables scattering and decay simulations involving polarized, asymptotic states, and preserves 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 $pp \to j j W^+_\lambda W^-_{\lambda'}$, with helicity eigenstates $(\lambda,\lambda')$ defined in various reference frames. We consider the Standard Model at both $\mathcal{O}(\alpha^4)$ and $\mathcal{O}(\alpha^2 \alpha_s^2)$ 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 briefly discussed.