Automated predictions from polarized matrix elements

Dec 3, 2019
47 pages
Published in:
  • JHEP 04 (2020) 082
  • Published: Apr 15, 2020
e-Print:
Report number:
  • CP3-19-52,
  • VBSCan-PUB-09-19,
  • MCnet-19-24,
  • IP/BBSR/2019-10

Citations per year

2020202120222023202402468101214
Abstract: (Springer)
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 ppjjWλ+Wλ pp\to {jjW}_{\lambda}^{+}{W}_{\lambda \prime}^{-} , with helicity eigenstates (λ, λ′) defined in various reference frames. We consider the Standard Model at both O \mathcal{O} 4^{4}) and O \mathcal{O} 2αs2^{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 discussed.
Note:
  • 47 pages, 10 figures (36 pdf files). Published in the JHEP
  • Helicity Polarization
  • Monte Carlo Simulations
  • Vector Boson Scattering
  • Composite Higgs
  • Polarization
  • Electroweak interaction
  • Hadron-Hadron scattering (experiments)
  • Beyond Standard Model
  • Top physics
  • parton: scattering