Constraints on large-extra-dimensions model through 125 GeV Higgs pair production at the LHC

TL;DR

This paper investigates how large-extra-dimensions models affect Higgs pair production at the LHC, showing that interference effects are significant and setting limits on the model's cutoff scale based on experimental data.

Contribution

It introduces a detailed analysis of LED effects on Higgs pair production, including interference with the standard model, and establishes new constraints on the model's cutoff scale using LHC data.

Findings

LED effects increase high-scale Pt and M_HH distributions.

Discovery limits on M_S are up to 6 TeV for delta=2.

Interference effects are crucial in analyzing Higgs pair production.

Abstract

Based on the analysis of 5 fb^-1 of data at the LHC, the ATLAS and CMS collaborations have presented evidence for a Higgs boson with a mass in the 125 GeV range. We consider the 125 GeV neutral Higgs pair production process in the context of large-extra-dimensions (LED) model including the Kaluza-Klein (KK)excited gravitons at the LHC. We consider the standard model(SM) Higgs pair production in gluon-gluon fusion channel and pure LED effects through graviton exchange as well as their interferences. It is shown that such interferences should be included; the LED model raises the transverse momentum (Pt)and invariant mass (M_HH) distributions at high scales of Pt and M_HH of the Higgs pair production. By using the Higgs pair production we could set the discovery limit on the cutoff scale M_S up to 6 TeV for delta = 2 and 4.5 TeV for delta = 6.