Abstract
We study W^+W^- and Zh final sstates at future linear e^+e^- colliders; designing analyses specific to the various final state polarizations allows us to target specific beyond the Standard Model (BSM) effects, parametrized in the form of dimension-6 operators. We find that CLIC can access effects roughly an order of magnitude smaller than HL-LHC or ILC, and two orders of magnitude smaller than LEP. These results are interpreted in the context of well-motivated BSM scenarios–at weak and strong coupling–where we expect correlated effects in Drell–Yann processes. The latter turn out to have better discovery potential, although the diboson processes provide additional discriminating power, potentially furnishing a way to measure the spin and coupling of BSM states.
Highlights
Processes involving the transverse polarizations suffer from suppressed Standard Model (SM)-beyond the Standard Model (BSM) interference; this is because the tree-level, high-energy diboson helicity structure in the SM (±, ∓) differs from (±, ±) implied by the leading BSM effects [18]
1 Here we focus on CP-even BSM physics, as CP-odd effects of this type are well constrained by measurements of anomalous dipole moments [34]
The high-energy indirect reach on BSM effects in Dibosons production at CLIC and ILC has been assessed, using an Effective Field Theory (EFT) approach to interpret the results in a model independent way
Summary
Standard Model (SM) precision tests are at the core of present and future collider programs. Processes involving the transverse polarizations suffer from suppressed SM-BSM interference; this is because the tree-level, high-energy diboson helicity structure in the SM (±, ∓) differs from (±, ±) implied by the leading BSM effects [18]. Lepton colliders offer an ideal environment to study these dedicated experiments [22,23,24,25,26,27]: beside providing an ideal context for precision studies, these machines present a number of qualitative differences with respect to hadron colliders, such as the possibility of beam polarisation and, in principle, the knowledge of the collision center-of-mass energy. 2 we discuss different weakly and strongly coupled BSM scenarios that can induce energy-growing effects in diboson processes and identify interesting patterns of EFT Wilson coefficients stemming from well-motivated microscopic assumptions. Ref. [31], appeared recently, has results which slightly overlap with our analysis of longitudinal polarizations
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
