Study of the $h\gamma Z$ coupling at the ILC

Abstract

We studied the $e^{+}{e}^{-}\to h\gamma$ process at the full simulation level, using a realistic detector model to study the feasibility to constrain the SM effective field theory (SMEFT) $h\gamma Z$ coefficient, ${\zeta }_{AZ}$, at the ILC. Assuming International Large Detector (ILD) operating at 250 GeV ILC, it is shown that the $e^{+}{e}^{-}\to h\gamma$ process is much more difficult to observe than naively expected if there is no BSM contribution. We thus put upper limits on the cross section of this process. The expected combined 95% C.L. upper limits for full polarisations $(P_{e^{-}},P_{e^{+}})=(-100\%,+100\%)$ and $(+100\%,-100\%)$ are $\frac{{\sigma }_{h\gamma }^L}{{\sigma }_{SM}^L}<5.0$ and $\frac{{\sigma }_{h\gamma }^R}{{\sigma }_{SM}^R}<61.9$, respectively. The resultant 95% C.L. limit on ${\zeta }_{AZ}$ is $-0.020<{\zeta }_{AZ}<0.003$.

arXiv commentThis study has been performed in the framework of the ILD concept group. Contribution to Snowmass 2021

References in corpus (7)

• WHIZARD: Simulating Multi-Particle Processes at LHC and ILC
• TMVA - Toolkit for Multivariate Data Analysis
• Particle Flow Calorimetry and the PandoraPFA Algorithm
• LCFIPlus: A Framework for Jet Analysis in Linear Collider Studies
• Single Higgs production in association with a photon at electron-positron colliders in extended Higgs models
• Diphoton resonance at the ILC
• Study of the $h\gamma Z$ coupling using $e^{+}{e}^{-}\to h\gamma$ at the ILC