The role of MSSM heavy Higgs production in the self coupling measurement of the 125 GeV Higgs boson at the LHC

TL;DR

This paper explores how heavy Higgs bosons in the MSSM can influence the measurement of the 125 GeV Higgs boson's self coupling at the LHC, especially through the decay channel H→hh.

Contribution

It analyzes the impact of MSSM heavy Higgs production on the Higgs self coupling measurement, highlighting the significance of the H→hh decay in certain parameter regimes.

Findings

H→hh decay can enhance the apparent Higgs self coupling.

The effect is prominent in low tanβ regimes with heavy Higgs masses between 250-600 GeV.

Heavy Higgs contributions can complicate the interpretation of self coupling measurements.

Abstract

Measurement of the self coupling of 125 GeV Higgs boson is one of the most crucial tasks for high luminosity run of the LHC and it can only be measured in the di-Higgs final state. In the minimal supersymmetric standard model, heavy CP even Higgs ($H$) can decay into lighter 125 GeV Higgs boson ($h$) and therefore influence the di-Higgs production. We investigate the role of single $H$ production in the measurement of self coupling of $h$. We find that $H \rightarrow hh$ decay can nontrivially affect the $h$ self coupling measurement in low tan$\beta$ regime when the mass of the heavy Higgs boson lies between 250 - 600 GeV and depending on the parameter space it may be seen as an enhancement of the self coupling of 125 GeV Higgs boson.