Impact of top-Higgs couplings on di-Higgs production at future colliders

TL;DR

This paper explores how non-standard top-Higgs couplings influence di-Higgs production at future colliders, revealing potential significant enhancements in production cross sections within current experimental constraints.

Contribution

It provides a detailed analysis of the impact of non-standard top-Higgs couplings on di-Higgs production at the LHC and ILC, considering recent Higgs data and interference effects.

Findings

Di-Higgs production cross section can be increased up to 3 times at LHC-14 TeV.

Di-Higgs production cross section can be increased up to 2 times at ILC-500 GeV.

Interference effects significantly alter di-Higgs production rates.

Abstract

Measuring the Higgs-self coupling is one of the most crucial goals of the future colliders, such as the LHC Run-II and the ILC-based photon collider. Since the new physics can affects the di-Higgs production not only from the Higgs self-coupling but also from the top-Higgs coupling, we investigate the di-Higgs production in the presence of the non-standard top-Higgs coupling at the LHC and ILC-based photon collider given the recent Higgs data. Due to the changed interference behaviors of the top quark loops with itself or $W$ boson loops, we find that the cross section of di-Higgs production at the LHC-14 TeV and ILC-500 GeV can be respectively enhanced up to nearly 3 and 2 times the SM predictions within 2$\sigma$ Higgs data allowed parameter region.