Studies of measuring Higgs self-coupling with $HH\rightarrow b\bar b γγ$ at the future hadron colliders

TL;DR

This study assesses the feasibility of measuring the SM Higgs self-coupling via the di-Higgs channel HH→bbγγ at future hadron colliders (14, 33, 100 TeV) using a Delphes-based ATLAS-like simulation. It shows increasing cross sections at higher energies yield higher significance (S/√B ≈ 2.3, 6.2, 15.0 for 14/33/100 TeV with 3 ab⁻¹) and projects self-coupling precisions of roughly 50%, 20%, and 8%, respectively. The analysis highlights that tight event selections bias acceptance with the coupling and advocates future optimization with multivariate and shape-based methods. Overall, the work underscores the potential of next-generation colliders to directly probe the Higgs sector and constrain new physics through deviations in $\lambda_{HHH}$.

Abstract

We present a feasibility study of observing $HH\rightarrow b\bar bγγ$ at the future hadron colliders with $\sqrt{s}=$14, 33, and 100 TeV. The measured cross section then can be used to constrain the Higgs self-coupling directly in the standard model. Any deviation could be a sign of new physics. The signal and background events are estimated using Delphes 3.0.10 fast Monte Carlo simulation based on the ATLAS detector capabilities. With 3 ab$^{-1}$ data, it would be possible to measure the Higgs self-coupling with a 50%, 20%, and 8% statistical accuracy by observing $HH\rightarrow b\bar bγγ$ at $\sqrt{s}=$14, 33, and 100 TeV colliders, respectively.

Figures (9)

• Figure 1: The Feynman diagrams for the $gg\rightarrow HH$ processes (left) and the corresponding production cross section as function of the collider energy $\sqrt{s}$ (right).
• Figure 2: The identification efficiency of photon as a function of photon $Et$ (upper left); the efficiency for $b$-jets (upper right); the invariant mass of $H\rightarrow \gamma\gamma$ (bottom left); and the invariant mass of $H\rightarrow b\bar{b}$ (bottom right).
• Figure 3: The normalized distributions for $Pt_H$, $\eta_H$, $M_{HH}$, and $y_{HH}$ at the colliders with $\sqrt{s}=$14, 33, 100 TeV, respectively.
• Figure 4: The normalized distributions for the sub-leading $b$-jet $Et$, $\Delta R_{b\bar{b}}$, $Pt_{b\bar{b}}$, and $M_{b\bar{b}}$ from the signal and various background processes.
• Figure 5: The normalized distributions for the sub-leading photon $Et$, $\Delta R_{\gamma\gamma}$, $Pt_{\gamma\gamma}$, and $M_{\gamma\gamma}$ from the signal and various background processes.