Feasibility study on cross-section measurement ofΥ(1S)→μ^+μ^- by using early CMS data  

作　　者：郭爽 胡震 钱思进 杨宗长 刘烈 

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

出　　处：《Chinese Physics C》2010年第8期1037-1044,共8页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (10099630);Ministry of Science and Technology of China(2007CB816101)

摘　　要：One of the first physics results that CMS will hopefully obtain will be the analysis of heavy quarkonium productions, including the Υ cross-section measurement. Since the Υ production cross-section from p-p collisions is expected to be relatively large, the analysis should be viable with rather small datasets which will be available soon after the start-up of the LHC. This paper describes the methods and plans for measuring the differential cross-section of Y（1S） →μ^＋μ- production, by using data to be collected from the CMS detector in the first LHC run. In this study, about 80 thousand Υ are reconstructed corresponding to an integrated luminosity of 6.4 pb^-1 in 10 TeV proton-proton collisions by using Monte Carlo data. The precision of this measurement is estimated to be about 16%, which is limited by the systematic errors.One of the first physics results that CMS will hopefully obtain will be the analysis of heavy quarkonium productions, including the Υ cross-section measurement. Since the Υ production cross-section from p-p collisions is expected to be relatively large, the analysis should be viable with rather small datasets which will be available soon after the start-up of the LHC. This paper describes the methods and plans for measuring the differential cross-section of Y（1S） →μ^＋μ- production, by using data to be collected from the CMS detector in the first LHC run. In this study, about 80 thousand Υ are reconstructed corresponding to an integrated luminosity of 6.4 pb^-1 in 10 TeV proton-proton collisions by using Monte Carlo data. The precision of this measurement is estimated to be about 16%, which is limited by the systematic errors.

关 键 词：LHC CMS upsilon mesons CROSS-SECTION 

分 类 号：O572.33[理学—粒子物理与原子核物理]