Study of Higgs Effective Couplings at Electron-Proton Colliders

TL;DR

This study investigates the potential of future electron-proton colliders to detect beyond the standard model Higgs couplings by analyzing specific processes and employing advanced reconstruction techniques, providing competitive bounds on new physics effects.

Contribution

It introduces a detailed analysis of dimension-six Higgs operators at LHeC and FCC-he, utilizing shape analysis and jet substructure techniques to improve sensitivity over existing collider results.

Findings

Stringent bounds on Wilson coefficients of dimension-six operators.

Improved sensitivity compared to high-luminosity LHC in some scenarios.

Effective use of jet substructure techniques for boosted Higgs reconstruction.

Abstract

We perform a search for beyond the standard model dimension-six operators relevant to the Higgs boson at the Large Hadron Electron Collider (LHeC) and the Future Circular Hadron Electron Collider (FCC-he). With a large amount of data (few ab$^{-1}$) and collisions at TeV scale, both LHeC and FCC-he provide excellent opportunities to search for the BSM effects. The study is done through the process $e^-p \to h j \nu_e$ where the Higgs boson decays into a pair of $b \bar{b}$ and we consider the main sources of background processes including a realistic simulation of detector effects. For the FCC-he case, in some signal scenarios to obtain an efficient event reconstruction and to have a good background rejection, jet substructure techniques are employed to reconstruct the boosted Higgs boson in the final state. In order to assess the sensitivity to the dimension-six operators, a shape analysis on the differential cross sections is performed. Stringent bounds are found on the Wilson coefficients of dimension-six operators with the integrated luminosities of 1 ab$^{-1}$ and 10 ab$^{-1}$ which in some cases show improvements with respect to the high-luminosity LHC results.