Speaker
Description
The processes of triboson production in high-energy proton–proton collisions provide a unique mean to probe the quartic interactions between EW gauge bosons and to perform indirect searches for physics beyond the Standard Model. Despite their small cross-sections, the production of 𝑉𝛾𝛾, 𝑉𝑉𝛾, 𝑉𝑉𝑉 (𝑉 = 𝑊 or 𝑍) at centre-of-mass energy of 13 TeV at the LHC has recently been observed by the ATLAS and CMS experiments. In this talk we present a SMEFT analysis based on total rates and differential distributions of triboson processes and show that NLO QCD corrections have striking effects on the sensitivity to dimension-6 operators. We finally present constraints on SMEFT operators from a global EW fit including electroweak precision observables (EWPOs), diboson (LEP & LHC) and triboson processes focussing on the impact of triboson measurements.
