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1. chinaXiv:201703.00619 [pdf]

Data taking strategy for phase study through ψ′ → K+K? decay

Wang Boqun; Mo Xiaohu; Yuan Changzheng; Ban Yong
Subjects: Physics >> Condensed Matter: Structural, Mechanical and Thermal Properties

The study of the relative phase between strong and electromagnetic amplitudes is of great importance for understanding the dynamics of charmonium decays. The information of the phase can be obtained model-independently by fitting the scan data of some special decay channels, one of which is ψ′ → K+K?. To find out the optimal data taking strategy for a scan experiment in the phase study of ψ′ → K+K? decay, the minimization process is analyzed in detail from a theoretical point of view.

submitted time 2017-03-26 Hits11371Downloads1203 Comment 0

2. chinaXiv:201608.00195 [pdf]

Study of Higgsstrahlung Cross Section and Higgs Mass Measurement Precisions with ZH ($Z\rightarrow \mu^+\mu^-$) events at CEPC

CHEN Zhen-Xing; YANG Ying; RUAN Man-Qi; WANG Da-Yong; LI Gang; JIN Shan; BAN Yong
Subjects: Physics >> Nuclear Physics

The Circular Electron Positron Collider (CEPC) is a future Higgs factory proposed by the Chinese high energy physics community. Using Monte Carlo samples of 5 ab?1 at 250 GeV center-of-mass energy, the benchmark luminosity of CEPC Higgs runs, model independent (MI) analyses on Higgsstrahlung (ZH) cross section σZH and Higgs mass mH are performed with ZH events where the Z boson decays into a pair of muons. The relative precision of σZH could reach 0.92\% and the mH could be measured to an accuracy of 6.5 MeV. Using information from Higgs decay final states, the backgrounds could be further reduced, leading to a mass precision of 5.4 MeV. The impacts of tracker size are investigated and parameterized for these measurements. Using similar analysis technology, we analyzed the capability of CEPC in measuring the Higgs invisible decay. Using ZH (Z→μ+μ?) events at 5 ab?1, the upper limit of invisible decay cross section beyond the standard model (SM) σBSMZH,H→inv can be determined to be 2.0 fb at 95\% confidence level.

submitted time 2016-08-30 Hits795Downloads467 Comment 0

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