Improved BSM Sensitivity in Diboson Processes

TL;DR

This paper demonstrates that future linear colliders like CLIC can significantly improve sensitivity to BSM effects in diboson processes compared to past and current colliders, with polarization-specific analyses enhancing detection capabilities.

Contribution

The study introduces polarization-specific analysis techniques for diboson processes at future colliders, achieving unprecedented sensitivity to dimension-6 operator effects.

Findings

CLIC can detect effects an order of magnitude smaller than HL-LHC.

Diboson processes offer additional discriminating power for BSM states.

Correlated effects in Drell-Yan processes provide complementary discovery potential.

Abstract

We study $W^+W^-$ and $Zh$ final states 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.