Cross section and Higgs mass measurement with Higgsstrahlung at the CEPC

Zhen-Xing Chen; Ying Yang; Man-Qi Ruan; Da-Yong Wang; Gang Li; Shan Jin; Yong Ban

doi:10.1088/1674-1137/41/2/023003

Chinese Physics C> 2017, Vol. 41> Issue(2) : 023003 DOI: 10.1088/1674-1137/41/2/023003

Cross section and Higgs mass measurement with Higgsstrahlung at the CEPC

Zhen-Xing Chen ^1,2,, ,
Ying Yang ² ,
Man-Qi Ruan ^2,, ,
Da-Yong Wang ^1,, ,
Gang Li ² ,
Shan Jin ² ,
Yong Ban ¹

1.
State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
2.
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
3.
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
4.
State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China

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Abstract：
The Circular Electron Positron Collider (CEPC) is a future Higgs factory proposed by the Chinese high energy physics community. It will operate at a center-of-mass energy of 240-250 GeV. The CEPC will accumulate an integrated luminosity of 5 ab^-1 over ten years of operation, producing one million Higgs bosons via the Higgsstrahlung and vector boson fusion processes. This sample allows a percent or even sub-percent level determination of the Higgs boson couplings. With GEANT4-based full simulation and a dedicated fast simulation tool, we have evaluated the statistical precisions of the Higgstrahlung cross section σ_ZH and the Higgs mass m_H measurement at the CEPC in the Z→μ⁺μ^- channel. The statistical precision of σ_ZH (m_H) measurement could reach 0.97% (6.9 MeV) in the model-independent analysis which uses only the information from Z boson decays. For the standard model Higgs boson, the m_H precision could be improved to 5.4 MeV by including the information from Higgs decays. The impact of the TPC size on these measurements is investigated. In addition, we studied the prospect of measuring the Higgs boson decaying into invisible final states at the CEPC. With the Standard Model ZH production rate, the upper limit of ß(H→inv.) could reach 1.2% at 95% confidence level.
- CEPC ,
- Higgs mass ,
- cross section

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Zhen-Xing Chen, Ying Yang, Man-Qi Ruan, Da-Yong Wang, Gang Li, Shan Jin and Yong Ban. Cross section and Higgs mass measurement with Higgsstrahlung at the CEPC[J]. Chinese Physics C, 2017, 41(2): 023003. doi: 10.1088/1674-1137/41/2/023003

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Received: 2016-01-21
Revised: 2016-10-25

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Supported by the Joint Funds of the NSFC (U1232105) and CAS Hundred Talent Program (Y3515540U1)

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沈阳化工大学材料科学与工程学院沈阳 110142

Cross section and Higgs mass measurement with Higgsstrahlung at the CEPC

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Cross section and Higgs mass measurement with Higgsstrahlung at the CEPC

Corresponding author: Zhen-Xing Chen,

Corresponding author: Man-Qi Ruan,

Corresponding author: Da-Yong Wang,

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