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

摘要

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 (MHH) distributions at high scales of Pt and MHH of the Higgs pair production. By using the Higgs pair production we could set the discovery limit on the cutoff scale MS up to 6 TeV for δ=2 and 4.5 TeV for δ=6.