Constraints on Higgs effective couplings in $H\nu \bar{\nu}$ production of CLIC at 380 GeV

TL;DR

This study investigates the sensitivity of the CLIC collider at 380 GeV to certain Higgs boson couplings using the process e+e- to neutrino neutrino Higgs, employing detailed simulations to set limits on effective field theory parameters.

Contribution

It provides the first detailed simulation-based constraints on CP-conserving dimension-six operators in Higgs production at CLIC at 380 GeV.

Findings

Set limits on effective couplings: c_HB, c_W, c_HW.

Used detailed fast simulation including parton showering and detector effects.

Achieved bounds improve understanding of Higgs interactions in a model-independent way.

Abstract

The potential of the $e^+e^-\to\nu \bar{\nu} H$ process in the first stage of CLIC considering center of mass energy of 380 GeV and assuming the baseline integrated luminosity of 500 fb$^{-1}$ is examined to probe CP conserving dimension-six operators in a model-independent Standard Model effective field theory framework. In the analysis, a detailed fast simulation on $e^+e^-\to\nu \bar{\nu} H$ signal processes and dominant backgrounds are performed including parton showering with PYTHIA and detector simulation based on ILD type detector with DELPHES in MadGraph. The obtained best limits on the $\bar{c}_{HB} $, $\bar{c}_{W}=- \bar{c}_{B}$ and $\bar{c}_{HW} $ are $[-4.82;1.53]\times10^{-2}$, $[-5.11;4.13]\times10^{-3}$ and $[-6.58;5.55]\times10^{-3}$, respectively.