Abstract
The High-Luminosity Large Hadron Collider (HL-LHC) is a major upgrade of the LHC, expected to deliver an integrated luminosity of up to 3000/fb over one decade. The very high instantaneous luminosity will lead to about 200 proton-proton collisions per bunch crossing (pileup) superimposed to each event of interest, therefore providing extremely challenging experimental conditions. The scientific goals of the HL-LHC physics program include precise measurement of the properties of the recently discovered standard model Higgs boson and searches for beyond the standard model physics (heavy vector bosons, SUSY, dark matter and exotic long-lived signatures, to name a few). In this contribution we will present the strategy of the CMS experiment to investigate the feasibility of such search and quantify the increase of sensitivity in the HL-LHC scenario.
Highlights
This paper presents physics studies and motivations that lead the development of the strategy of the future operation of the LHC collider with high luminosity (HL-LHC), called LHC Phase-2
Test of the Standard Model can be performed with sufficient precision in the Higgs sector, by accurately measuring the couplings to fermions and bosons
The present status of the Higgs strength and couplings precision measurement performed by the CMS experiment is summarized in [5], where the the main decay channels of the Higgs bosons are exploited (WW, ZZ, γγ, μμ, ττ, bb)
Summary
This paper presents physics studies and motivations that lead the development of the strategy of the future operation of the LHC collider with high luminosity (HL-LHC), called LHC Phase-2. After the third long shutdown of the machine, that will take place around 2023, the instantaneous luminosity will be increased up to five times the design value, with 40 MHz operation (one bunch crossing every 25 ns) at a center of mass energy of 14 TeV This yields challenging conditions for the CMS detector: up to 200 overlaying (pileup) events, high rates and high radiation levels, especially in the forward regions. It is foreseen that the total accumulated luminosity will reach 3000/fb of data, corresponding to ten times the data expected at the end of Phase1 This environment offers great opportunities to shade some light on some unexplored or not fully explored physics searches. The planned upgrades of the CMS experiment in view of the HL-LHC phase will take place around 2023 and are fully described in [1], [2], [3], [4]
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