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Tang G, Chen S, Chen Y, Duan Z, Ruan M, An G, Huang Y, Lou X, Zhang J, Lan X, Zhang C. The circular electron-positron collider beam energy measurement with Compton scattering and beam tracking method. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2020; 91:033109. [PMID: 32259928 DOI: 10.1063/1.5132975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Accepted: 03/04/2020] [Indexed: 06/11/2023]
Abstract
The beam energy of the circular electron-positron collider should be measured precisely to the order of 1 MeV, in order to decrease the uncertainty of the Higgs/W/Z bosons' mass measurement. For this purpose, a lepton bunch is extracted from the collider and collides with an Yttrium-Aluminum-Garnet laser pulse. After the inverse Compton scattering, the main beam and the scattered beam pass through an analytical magnetic field and are deflected to different angles. At the end of the drift beam pipes, the deflecting distances are detected with the spatial resolution of several microns. The systematic uncertainties caused by the detector arrangement, the magnetic field, the angle between the detector plane and the incident beam, and the synchrotron radiation are discussed in detail. The simulations of the statistical errors are given with a toy Monte Carlo sample. With some proper corrections, the beam energy uncertainty of the Higgs mode is around 2 MeV. Our method is applicable to different operating modes of the collider.
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Affiliation(s)
- Guangyi Tang
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Shanhong Chen
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Yuan Chen
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Zhe Duan
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Manqi Ruan
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Guangpeng An
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Yongsheng Huang
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Xinchou Lou
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Jianyong Zhang
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Xiaofei Lan
- Physics and Space Science College, China West Normal University, Nanchong 637009, China
| | - Chunlei Zhang
- College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
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Blondel A. Precision electroweak physics at LEP and the top-quark mass. J Otolaryngol Head Neck Surg 1996. [DOI: 10.1007/bf02731711] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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