Abstract
The discovery of the Higgs boson in 2012 provided confirmation of spontaneous electroweak symmetry breaking as the mechanism by which fundamental particles gain mass and thus completed the Standard Model of particle physics. Additionally, it opened a new approach to searching for potential new particles. Many beyond the Standard Model theories predict new heavy particles that couple to the Higgs boson, leading to a resonant production mode of Higgs boson pairs. Other theories extend the Higgs sector by introducing additional scalar bosons that differ from the observed Higgs boson only by mass. The ATLAS and CMS Collaborations have searched for evidence of such processes using s=13 TeV Run 2 proton-proton collision data at the Large Hadron Collider. This review article summarizes the latest experimental results from searches for resonant production of pairs of Higgs bosons or additional Higgs-like scalar bosons at ATLAS and CMS.
Highlights
The 2012 discovery of the Higgs boson (H) [1,2] provided the final missing piece of the Standard Model (SM) of particle physics by confirming the mechanism of spontaneous electroweak symmetry breaking to generate masses for fundamental particles
The coupling of the observed Higgs boson to vector bosons is consistent with the SM predictions, resulting in strongly suppressed couplings for the other scalars predicted by such models
The bbbbchannel presents the challenges of a large quantum chromodynamics (QCD) multijet background and a roughly isotropic resolved signal topology that is difficult to distinguish from background
Summary
The 2012 discovery of the Higgs boson (H) [1,2] provided the final missing piece of the Standard Model (SM) of particle physics by confirming the mechanism of spontaneous electroweak symmetry breaking to generate masses for fundamental particles. As with the discovery of all new particles, the discovery of the Higgs boson has provided an important new means of searching for evidence of new Beyond the Standard Model (BSM) physics effects or additional heavy particles. The observation of such a resonant production would appear as an excess in HH production over the SM prediction localized in the HH invariant mass (mHH) spectrum. A comprehensive review of the status of theoretical and experimental efforts related to searches for HH production was previously presented in Reference [3]. The searches in this review all use simulated signal samples Except where specified, these simulated samples are generated assuming no interference with SM processes and assuming 100% branching fractions into SM decay products. Resonances are typically generated with a width that is smaller than detector resolution, and interference effects from SM HH production are neglected
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