Circular Electron Positron Collider
Template:Short description The Circular Electron Positron Collider (CEPC) is a proposed Chinese electron positron collider for experimenting on the Higgs boson. It would be the world's largest particle accelerator with a circumference of Template:Convert.[1]
CEPC was proposed by the Chinese Academy of Sciences' Institute of High Energy Physics in 2012.[2][1] Projections in 2023 were for a proposal to be submitted to the government in 2025, and construction taking place from 2027 to 2035; the projected cost was Template:CNY, including experiments.[3]
The design was produced by a team of international physicists.[1] The technical design report was released in December 2023.[3]
Description
CEPC is projected to have a maximum center-of-mass energy of 240 GeV.[2] It will be located Template:Convert underground, and have two detectors.[1] The electron-positron collisions will allow clearer observations than the proton-proton collisions of the Large Hadron Collider (LHC).[1]
After 2040, the collider could be upgraded into the Super Proton–Proton Collider[2] with collision energies seven times greater than the LHC.[1]
Physics program
The CEPC enables a wide physics program. As an electron-positron collider, it is suited to precision measurements, but also has strong discovery potential for new physics. Some possible physics goals include:
- Higgs measurements: Running slightly above the production threshold for ZH, the CEPC is a Higgs factory. Over the course of a ten-year run, it is planned to collect 5 ab−1 with two detectors, which corresponds to approximately one million produced Higgs Bosons.[4] One target is to be able to measure the ZH production cross-section to 0.5% accuracy. Other goals include the measurement of the Higgs Boson self coupling, and its coupling to other particles.
- When running at the Z peak, a precision measurement of the Z Boson mass and other properties, e.g. the Zbb̅ coupling, can be made.[5]
- Physics beyond the Standard Model:[6] Despite the lower center-of-mass energy compared to the LHC, the CEPC will be able to make discoveries or exclusions in certain scenarios where the LHC cannot. A prominent situation is when there is supersymmetry, but the masses of the superpartners are very close to each other (near-degenerate). In this case, when one SUSY particle decays into another plus a Standard Model particle, the SM particle will likely escape detection in a Hadron collider. In an e+e− collider, since the initial state is completely known, it is possible to detect such events by their missing energy (the energy carried away by SUSY particles and neutrinos).
See also
- Large Electron–Positron Collider – LEP was the highest energy lepton collider ever built
- Compact Linear Collider – another post-LHC linear particle accelerator planned at CERN
- International Linear Collider – another post-LHC linear particle accelerator planned in Japan
- Future Circular Collider – a proposed 100 TeV circular collider at CERN
References
External links
- Record for CEPC on INSPIRE-HEP
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Template:Cite journal
- ↑ 2.0 2.1 2.2 Template:Cite web
- ↑ 3.0 3.1 Template:Cite web
- ↑ Template:Cite web Workshop on Physics at the CEPC, August 10–12, 2015
- ↑ Template:Cite web Workshop on Physics at the CEPC, August 10–12, 2015
- ↑ Template:Cite web Workshop on Physics at the CEPC, August 10–12, 2015