Anomalous Higgs Couplings at the LHeC

TL;DR

This paper investigates how the proposed LHeC collider can precisely measure anomalous Higgs couplings, setting limits on new physics effects in the Higgs sector through effective field theory analysis.

Contribution

It provides the first detailed analysis of the LHeC's potential to constrain anomalous Higgs couplings using dimension-six operators in an effective Lagrangian framework.

Findings

95% CL limits on anomalous $HWW$ and $HWW extgamma$ couplings

Sensitivity estimates for new physics scale at $ ext{1 TeV}$

Analysis based on specific production processes at LHeC

Abstract

The discovery of Higgs boson plays a crucial role in understanding the electroweak symmetry breaking sector. From now on, solving the dynamics of this sector needs precision measurements of the couplings of the Higgs boson to the standard model particles. In this work, we investigate the constrains on the anomalous $HWW$ and $HWW\gamma$ couplings, described by the dimension-six operators in the effective Lagrangian, in a high energy envisaged ep collider which is called Large Hadron electron Collider (LHeC). We obtained the 95 % confidence level limits on the couplings of anomalous $HWW$ and $HWW\gamma$ vertex, with the design luminosity of 10 fb$^{-1}$ and electron beam energy of 140 GeV, through $ep\to \nu H +X$, $\gamma p\to W H +X$ and $e\gamma\to W H \nu$ processes by considering the new physics energy scale to be $\Lambda$= 1 TeV. The sensitivity of the LHeC to the new physics scale is also briefly discussed.