Abstract
The High-Luminosity Large Hadron Collider will provide an unprecedented opportunity to study the properties of the Higgs boson and eventually probe for new physics beyond the Standard Model. The large anticipated data sample will allow for more precise investigations of topics already studied with earlier data samples, as well as for studies of processes that are accessible only with the much larger statistics. Rates and signal strengths will be measured for a variety of Higgs boson production and decay modes, allowing extraction of the Higgs boson couplings. Particular final states will allow differential cross-sections to be measured for all production modes, and for studies of the Higgs boson width and CP properties, as well as the tensor structure of its coupling to vector bosons. An important part of the High-Luminosity LHC experimental program will be investigations of the Higgs boson self-coupling, which is accessible via studies of di-Higgs production. In this note the projections of the ATLAS physics reach in the Higgs sector at the High-Luminosity LHC are discussed and some selected analyses are presented.
Highlights
The ATLAS and CMS collaborations at the Large Hadron Collider (LHC) announced the discovery of a Higgs-like boson in the summer of 2012[1],[2]
These results strongly suggest that the newly discovered particle is a Higgs boson and that a non-zero vacuum expectation value of a Higgs doublet is responsible for electroweak (EW) symmetry breaking[7],[8],[9]
There is a program underway to extend the LHC operations and further increase the luminosity to up to 7.5 times the design value, to allow the size of the dataset to be increased to 3000 fb−1, over about a ten-year period starting in mid-2026
Summary
The ATLAS and CMS collaborations at the Large Hadron Collider (LHC) announced the discovery of a Higgs-like boson in the summer of 2012[1],[2]. After the second scheduled long shutdown (LS2) in 2019-2020, the instantaneous luminosity will be increased by at least another factor of two allowing the LHC experiments to collect approximately ten times more data per year as compared to the rate achieved by the end of 2012. There is a program underway to extend the LHC operations and further increase the luminosity to up to 7.5 times the design value, to allow the size of the dataset to be increased to 3000 fb−1, over about a ten-year period starting in mid-2026 This phase of the experimental program is referred to as the High-Luminosity LHC, or HL-LHC and will commence after another scheduled long shutdown in 2024-2026 (LS3)[10]. The pileup assumption varies from < μ >≈140 to as high as < μ >≈200
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