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 100 kilometres (62 mi).[1]

CEPC was proposed by the Chinese Academy of Sciences' Institute of High Energy Physics in 2012.[2][1] The design was produced by a team of international physicists.[1] Development[1] and site selection[2] were proceeding in 2018. Construction would begin in 2022, with experiments starting in 2030. It is expected to cost CN¥30 billion.[1]

Description

CEPC is projected to have a maximum center-of-mass energy of 240 GeV.[2] It will be located 100 metres (330 ft) 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.[3] 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.[4]
  • Physics beyond the Standard Model:[5] 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

References

  1. 1 2 3 4 5 6 7 8 Gibney, Elizabeth (23 November 2018). "Inside the plans for Chinese mega-collider that will dwarf the LHC". Nature. doi:10.1038/d41586-018-07492-w. S2CID 115440460. Retrieved 26 December 2021.
  2. 1 2 3 4 "The CEPC Project". Institute of High Energy Physics. Retrieved 26 December 2021.
  3. ↑ LOU, Xinchou. "Overview of the CEPC project" (PDF). Workshop on Physics at the CEPC, August 10–12, 2015
  4. ↑ Gu, Jiayin. "Probing Zbb̅ couplings at the CEPC" (PDF). Workshop on Physics at the CEPC, August 10–12, 2015
  5. ↑ Craig, Nathaniel. "Naturalness and Higgs Measurements" (PDF). Workshop on Physics at the CEPC, August 10–12, 2015
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