Browsing by Author "An, F."
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Item Monte Carlo Study of Particle Identification at the CEPC Using TPC dE/dx Information(Springer) An, F.; Prell, S.; Chen, C.; Cochran, J.; Lou, Xinchou; Ruan, M.; 0000-0003-0867-2189 (Lou, X); Lou, XinchouThe kaon identification is crucial for the flavor physics, and also benefits the flavor and charge reconstruction of the jets. We explore the particle identification capability for tracks with momenta ranging from 2- 20 GeV/c using the dE/dx measurements in the Time Projection Chamber at the future Circular Electron-Positron Collider. Based on Monte Carlo simulation, we anticipate that an average 3.2 σ (2.6 σ) K/π separation can be achieved based on dE/dx information for an optimistic (conservative) extrapolation of the simulated performance to the final system. Time-of-flight (TOF) information from the Electromagnetic Calorimeter can provide K/π separation around 1 GeV/c and reduce the K/p mis-identification rate. By combining the dE/dx and TOF information, we estimate that in the optimistic scenario a kaon selection in inclusive hadronic Z decays with both the average efficiency and purity approaching 95% can be achieved.Item Precision Higgs Physics at the CEPC(Institute of Physics Publishing, 2019-03-04) An, F.; Bai, Y.; Chen, C.; Chen, X.; Chen, Z.; Da Costa, J. G.; Cui, Z.; Jyotishmati, Susmmita; Lou, Xinchou; 0000-0003-0867-2189 (Lou, X); Jyotishmati, Susmmita; Lou, XinchouThe discovery of the Higgs boson with its mass around 125 GeV by the ATLAS and CMS Collaborations marked the beginning of a new era in high energy physics. The Higgs boson will be the subject of extensive studies of the ongoing LHC program. At the same time, lepton collider based Higgs factories have been proposed as a possible next step beyond the LHC, with its main goal to precisely measure the properties of the Higgs boson and probe potential new physics associated with the Higgs boson. The Circular Electron Positron Collider (CEPC) is one of such proposed Higgs factories. The CEPC is an e⁺e⁻ circular collider proposed by and to be hosted in China. Located in a tunnel of approximately 100 km in circumference, it will operate at a center-of-mass energy of 240 GeV as the Higgs factory. In this paper, we present the first estimates on the precision of the Higgs boson property measurements achievable at the CEPC and discuss implications of these measurements. © 2019 Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Sciences and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.