# Dimension-6 Operator Analysis of the CLIC Sensitivity to New Physics

## TL;DR

This paper evaluates CLIC's potential to detect new physics through precise measurements of Higgs and W boson production, using effective field theory to set sensitivity limits on new physics scales up to 10 TeV.

## Contribution

It introduces a comprehensive analysis of CLIC's sensitivity to dimension-6 operators in the Standard Model EFT, including higher energy Higgsstrahlung projections not previously considered.

## Key findings

- CLIC can probe new physics scales up to ~10 TeV for individual operators.
- Global fits reduce sensitivity to around 1 TeV.
- Constraints are demonstrated for scenarios like stop quarks and dilaton/radion.

## Abstract

We estimate the possible accuracies of measurements at the proposed CLIC $e^+e^-$ collider of Higgs and $W^+W^-$ production at centre-of-mass energies up to 3TeV, incorporating also Higgsstrahlung projections at higher energies that had not been considered previously, and use them to explore the prospective CLIC sensitivities to decoupled new physics. We present the resulting constraints on the Wilson coefficients of dimension-6 operators in a model-independent approach based on the Standard Model effective field theory (SM EFT). The higher centre-of-mass energy of CLIC, compared to other projects such as the ILC and CEPC, gives it greater sensitivity to the coefficients of some of the operators we study. We find that CLIC Higgs measurements may be sensitive to new physics scales $\Lambda = \mathcal{O}(10)$TeV for individual operators, reduced to $\mathcal{O}(1)$ TeV sensitivity for a global fit marginalising over the coefficients of all contributing operators. We give some examples of the corresponding prospective constraints on specific scenarios for physics beyond the SM, including stop quarks and the dilaton/radion.