J/ψ→μ～+μ～- reconstruction in the CMS experiment  

作　　者：杨宗长 钱思进 

机构地区：[1]State Key Laboratory of Nuclear Science and Technology, Peking University

出　　处：《Chinese Physics C》2009年第3期161-169,共9页中国物理C（英文版）

基　　金：Supported by NSFC (10435070, 10099630);Ministry of Science and Technology of China (2007CB816101)

摘　　要：In this paper the J/ψ→μ^＋μ^- reconstruction performance in the CMS experiment at the LHC is studied in detail by using B8→J/ψφ→μμKK events. The reconstruction efficiencies of J/ψ mesons and their decay muons are obtained as a function of the transverse momentum PT and the pseudo-rapidity η. We also study the muon trigger efficiency for this channel with the planned Level-1 trigger and High Level Trigger selection criteria. It was observed that the muon reconstruction efficiency decreases when the two decay muons have a small or large 3D angular separation, which further affects the overall J/ψ reconstruction efficiency.In this paper the J/ψ→μ^＋μ^- reconstruction performance in the CMS experiment at the LHC is studied in detail by using B8→J/ψφ→μμKK events. The reconstruction efficiencies of J/ψ mesons and their decay muons are obtained as a function of the transverse momentum PT and the pseudo-rapidity η. We also study the muon trigger efficiency for this channel with the planned Level-1 trigger and High Level Trigger selection criteria. It was observed that the muon reconstruction efficiency decreases when the two decay muons have a small or large 3D angular separation, which further affects the overall J/ψ reconstruction efficiency.

关 键 词：CMS J/Ψ reconstruction efficiency Level-1 trigger HLT （High Level Trigger） 

分 类 号：O572.214[理学—粒子物理与原子核物理]