New Physics Opportunities in the Boosted Di-Higgs-Boson Plus Missing Transverse Energy Signature

Area of Science:

• Particle Physics
• High Energy Physics
• Cosmology

Background:

• The Standard Model (SM) of particle physics describes fundamental particles and forces, but it does not account for dark matter or neutrino masses.
• The Higgs field, a crucial component of the SM, may interact with undiscovered physics sectors that could explain these phenomena.

Purpose of the Study:

• To propose a novel experimental signature, boosted di-Higgs bosons plus missing transverse energy (E_T), to search for new physics.
• To investigate the potential of this signature in probing new physics sectors related to dark matter and massive neutrinos.

Main Methods:

• The study focuses on the signature of boosted di-Higgs boson production accompanied by significant missing transverse energy (E_T), indicative of undetected particles like dark matter or neutrinos.
• Simulations and analyses are performed for the high-luminosity Large Hadron Collider (LHC) at a center-of-mass energy of 14 TeV.
• The proposed signature is evaluated within benchmark models including supersymmetry (SUSY) and seesaw mechanisms for neutrino masses.

Main Results:

• The boosted di-Higgs plus E_T signature offers a clear signal with a low background, detectable at the LHC with a production rate as low as approximately 0.1 fb.
• In specific benchmark models, this signature can probe the masses of the Higgsino (up to ~500 GeV), right-handed neutrinos (up to ~650 GeV), and heavy vector bosons (up to ~900 GeV).

Conclusions:

• The boosted di-Higgs plus E_T signature is a powerful tool for exploring new physics beyond the Standard Model, particularly in scenarios involving dark matter and neutrino mass generation.
• This search strategy is highly relevant for supersymmetric standard models and low-scale seesaw mechanisms, providing sensitivity to new particles at the multi-hundred GeV scale.