Measuring the 2HDM Scalar Potential at LHC14

TL;DR

This paper assesses the potential of the LHC14 to measure the scalar self-couplings in the Two Higgs Doublet Model, focusing on Higgs pair production channels to probe the scalar potential.

Contribution

It provides a detailed analysis of Higgs pair production channels in the 2HDM to measure trilinear couplings, offering new insights into scalar potential measurements at LHC14.

Findings

Identification of promising search channels at LHC14.

Estimated sensitivities for discovering Higgs pair production.

Complementary probes of the scalar potential beyond the decoupling limit.

Abstract

After the extraordinary discovery of the Higgs boson at the LHC, the next goal is to pin down its underlying dynamics by measuring the Higgs self-couplings, along with its couplings to gauge and matter particles. As a prototype model of new physics in the scalar sector, we consider the Two Higgs Doublet Model (2HDM) with CP-conservation, and evaluate the prospects for measuring the trilinear scalar couplings among the CP-even Higgs bosons $h$ and $H$ ($\lambda^{hhh}$, $\lambda^{hhH}$, $\lambda^{hHH}$) at LHC14. The continuum and resonant production of CP-even Higgs boson pairs, $hh$ and $hH$, offer complementary probes of the scalar potential away from the light-Higgs decoupling limit. We identify the viable search channels at LHC14 and estimate their expected discovery sensitivities.