| Abstract: | The discovery of the Higgs boson in 2012, by the ATLAS and CMS experiments,
was a success achieved with only a percent of the entire dataset foreseen for
the LHC. It opened a landscape of possibilities in the study of Higgs boson
properties, Electroweak Symmetry breaking and the Standard Model in general, as
well as new avenues in probing new physics beyond the Standard Model. Six years
after the discovery, with a conspicuously larger dataset collected during LHC
Run 2 at a 13 TeV centre-of-mass energy, the theory and experimental particle
physics communities have started a meticulous exploration of the potential for
precision measurements of its properties. This includes studies of Higgs boson
production and decays processes, the search for rare decays and production
modes, high energy observables, and searches for an extended electroweak
symmetry breaking sector. This report summarises the potential reach and
opportunities in Higgs physics during the High Luminosity phase of the LHC,
with an expected dataset of pp collisions at 14 TeV, corresponding to an
integrated luminosity of 3~ab$^{-1}$. These studies are performed in light of
the most recent analyses from LHC collaborations and the latest theoretical
developments. The potential of an LHC upgrade, colliding protons at a
centre-of-mass energy of 27 TeV and producing a dataset corresponding to an
integrated luminosity of 15~ab$^{-1}$, is also discussed. |
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