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Description
A search for Higgs boson pair production via vector-boson fusion is performed in the Lorentzboosted regime, where a Higgs boson candidate is reconstructed as a single large-radius jet, using 140 $fb^{-1}$ of proton–proton collision data at $\sqrt{s} = 13 TeV$ recorded by the ATLAS detector at the Large Hadron Collider. Only Higgs boson decays into bottom quark pairs are considered. The search is particularly sensitive to the quartic coupling between two vector bosons and two Higgs bosons relative to its Standard Model prediction, $\kappa_{2v}$. This study constrains $\kappa_{2v}$ to $0.55 < \kappa_{2v} < 1.49$ at 95% confidence level. The value $\kappa_{2v}=0$ is excluded with a significance of 3.8 standard deviations with other Higgs boson couplings fixed to their Standard Model values. A search for new heavy spin-0 resonances that would mediate Higgs boson pair production via vector-boson fusion is carried out in the mass range of $1–5TeV$ for the first time under several model and decay-width assumptions. No significant deviation from the Standard Model hypothesis is observed and exclusion limits at 95% confidence level are derived.
Reference:
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ATLAS Collaboration, "Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC," Phys. Lett. B 716 (2012) 1, arXiv:1207.7214 [hep-ex].
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CMS Collaboration, "Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC," Phys. Lett. B 716 (2012) 30, arXiv:1207.7235 [hep-ex].
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ATLAS Collaboration, "The ATLAS Experiment at the CERN Large Hadron Collider," JINST 3 (2008) S08003.
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CMS Collaboration, "The CMS experiment at the CERN LHC," JINST 3 (2008) S08004.
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L. Evans and P. Bryant, "LHC Machine," JINST 3 (2008) S08001.
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