APS2020

Abstracts

Higgsstrahlung and double Higgs production at high-energy CLIC operation

• Speaker: Ulrike Schnoor
• Track: Physics of the Higgs boson
• Abstract: The Compact Linear Collider (CLIC) is a mature option for a future electron-positron collider operating at centre-of-mass energies of up to 3 TeV. CLIC will be built and operated in a staged approach with three centre-of-mass energy stages currently assumed to be 380 GeV, 1.5 TeV, and 3 TeV. This presentation focusses on unique opportunities at the multi-TeV stages in the area of Higgs physics. Two physics studies based on full detector simulations will be discussed: Higgsstrahlung (e+e- -> ZH) and the extraction of the Higgs self-coupling from double Higgs production. The first is particularly interesting as contributions from BSM effects to the Higgsstrahlung process grow with energy. Substructure information can be used to identify fully hadronic ZH events at 3 TeV to maximise the statistical precision. B-tagging in boosted Higgs boson decays was studied for the first time for CLIC. New projections for the ZH event rate and angular distributions will be shown. The Higgs self-coupling is of particular interest: for determining the shape of the Higgs potential, and due to its sensitivity to a variety of BSM physics scenarios. At the higher-energy stages CLIC will produce Higgs boson pairs both via double Higgsstrahlung and via vector-boson fusion. Measurements of these processes lead to a determination of the Higgs self-coupling with a precision around 10%.
• Slides

The CLIC potential for new physics

• Speaker: none
• Track: Beyond Standard Model Physics (Not including SUSY)
• Status: accepted as poster
• Abstract: The Compact Linear Collider (CLIC) is a mature option for a future electron-positron collider operating at centre-of-mass energies of up to 3 TeV. CLIC will be built and operated in a staged approach with three centre-of-mass energy stages currently assumed to be 380 GeV, 1.5 TeV, and 3 TeV. A selection of results from recent studies will be presented showing that CLIC has excellent sensitivity to many BSM physics scenarios. New particles can be discovered in a model-independent way almost up to the kinematic limit. Compared with hadron colliders, the low background conditions at CLIC provide extended discovery potential, in particular for the production through electroweak and/or Higgs boson interactions. This includes long-lived states, for example through the reconstruction of disappearing tracks. In addition to studying new particles directly, BSM models can be probed up to scales far beyond the centre-of-mass energy of the collider via precision measurements of Standard Model processes. Beam polarisation allows further constraints on the underlying theory in many cases.

Overview of the Compact Linear Collider (CLIC) project and its physics potential

• Speaker: none
• Track: International physics, International Physics with accelerators / Particle Physics
• Status: accepted as poster
• Abstract: The Compact Linear Collider (CLIC) is a proposed TeV -scale high-luminosity electron-positron collider. For an optimal exploitation of its physics potential, CLIC is foreseen to be built and operated in three stages, with centre-of-mass energies ranging from 380 GeV up to 3 TeV. Electron beam polarisation is provided at all energies. The initial energy stage will focus on precision measurements of Higgs-boson and top-quark properties. The subsequent energy stages enhance the reach of many direct and indirect searches for new physics beyond the Standard Model and give access to the Higgs self-coupling. The CLIC accelerator design is based on a two-beam acceleration scheme with normal-conducting acceleration structures reaching 100 MV/m. Following many years of beam simulations, component tests, large-scale system tests and design optimisation, CLIC recently produced a comprehensive overview of its physics case, the accelerator design and the detector to the European strategy process. The talk will provide an overview of the CLIC project and its physics potential.

-- EricaBrondolin - 2020-01-08