TeVγ暴搜寻中最优窗口角半径的探讨  

Study on the Optimum Angular Radius of Windows in Searching for TeV GRBs

作　　者：陈欣[1] 周勋秀[1] 胡红波[1] 刘琨[1] 杨群羽[1] 木钧[2] 

机构地区：[1]中国科学院高能物理研究所,北京100039 [2]云南大学物理系,昆明650091

出　　处：《高能物理与核物理》2004年第10期1094-1098,共5页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金 (10 12 0 13 0 794) ;中国科技部;中国科学院 ;高能物理研究所粒子天体物理重点实验室资助~~

摘　　要：作为搜寻TeVγ暴最主要的观测手段———广延大气簇射阵列 ,其阵列角分辨值常用于确定搜寻窗口的大小 .为了在一个合理大小的窗口内对TeVγ暴进行搜寻 ,本文从理论上推导出一个统计意义上的最优窗口角半径 ,然后用MonteCarlo方法进行了模拟验证 .结合入射信号强度、背景强度、计算显著性的不同方法等因素 ,进一步对窗口角半径进行了讨论 .并在小统计情况下 ,给出了计算显著性的经验公式 .TeV GRBs are so far only searched by EAS arrays which typically have an angular resolution at about 1°. With the limited power in identifying γ ray events from proton background events,a search window in the size of angular resolution is often chosen in many experiments. In attempting to optimize the average search sensitivity,an analytic method to determine the window size is proposed and verified by Monte Carlo method in various conditions,including different signal,background intensities and different significance calculation methods. Finally,at the situation of low statistics,an empirical significance calculation formula seems to be possible.

关 键 词：Γ暴 半径 广延大气簇射 观测手段 CARLO方法 推导 阵列 窗口 最优 搜寻 

分 类 号：O572[理学—粒子物理与原子核物理]