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A pattern matching based tracking algorithm, named MdcPatRec, is used for the reconstruction of charged tracks in the drift chamber of the BES detector. This paper addresses the shortage of segment finding in the MdcPatRec algorithm. An extended segment construction scheme and the corresponding pattern dictionary are presented. Evaluation with Monte-Carlo and experimental data show that the new method can achieve higher efficiency for low transverse momentum tra 相似文献
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参考国内外现有的τ-c工厂及其探测器的设计结果,给出了BTCF探测器的总体指标. 根据这些指标设计并开发了用于BTCF物理研究的快速蒙特卡罗模拟方法,并用此方法对一系列重要的物理课题进行了蒙特卡罗模拟. 文中描述了该模拟方法的设计思想、程序流程以及这种方法在BTCF可行性研究乃至预制研究阶段的优越性,同时也给出了对若干重要物理问题的模拟结果. 从而论证了建造BTCF的必要性和不可替代性. 相似文献
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赵川 孙胜森 李澄 张晓杰 何康林 安琪 陈宏芳 代洪亮 封常青 衡月昆 黄亚齐 黄燕萍 郭建华 李卫东 李秀荣 刘芳 刘怀民 刘树彬 刘曙东 刘勇 马想 毛泽普 邵明 孙勇杰 孙志嘉 吴金杰 杨桂安 赵雷 朱兴旺 左嘉旭 《中国物理 C》2011,35(1)
The time calibration for end cap TOF system of BESⅢ is studied in this paper. It has achieved about 110 ps time resolution for muons in dimu events. The pulse height correction using electronic scan curve and the predicted time calculated using Kalman filter method are introduced. This paper also describes the study of using electrons and muons as calibration samples. 相似文献
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言杰 孙胜森 李澄 何康林 安琪 边渐鸣 曹国富 曹学香 陈宏芳 邓子艳 封常青 傅成栋 何苗 衡月昆 黄彬 郭建华 贾卢魁 季晓斌 李卫东 梁羽铁 刘春秀 刘怀民 刘树彬 刘曙东 刘勇 罗涛 马秋梅 马想 毛泽普 莫晓虎 邱进发 邵明 孙晓东 孙勇杰 孙永昭 孙志嘉 田浩来 王纪科 文硕频 吴金杰 伍灵慧 吴智 谢宇广 徐敏 严亮 杨桂安 袁野 张长春 张建勇 张瑶 赵川 赵雷 朱永生 邹佳恒 《中国物理 C》2010,34(3):368-373
The principle of the method for the BESIII TOF calibration using cosmic ray data without magnetic field are reported in this paper. After applying calibration constants, the single-end readout time resolution could reach about 150 ps, and the time resolution for one layer is achieved to be about 110 ps. The paper also described the extraction scheme for the event start time of cosmic events. 相似文献
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贾卢魁 毛泽普 李卫东 曹国富 曹学香 邓子艳 何康林 刘春燕 刘怀民 刘秋光 马秋梅 马想 邱进发 田浩来 王纪科 伍灵慧 袁野 臧石磊 张长春 张雷 张瑶 朱凯 邹佳恒 《中国物理 C》2010,34(12):1866-1873
In order to overcome the difficulty brought by the circling charged tracks with transverse momentum less than 120 MeV in the BESⅢ Main Drift Chamber (MDC), a specialized method called TCurlFinder was developed. This tracking method focuses on the charged track reconstruction under 120 MeV and possesses a special mechanism to reject background noise hits. The performance of the package has been carefully checked and tuned by both Monte Carlo data and real data. The study shows that this tracking method could obviously enhance the reconstruction efficiency in the low transverse momentum region, providing physics analysis with more and reliable data. 相似文献
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徐敏 何康林 张子平 王贻芳 边渐鸣 曹国富 曹学香 陈申见 邓子艳 傅成栋 高原宁 韩磊 韩少卿 何苗 胡继峰 胡小为 黄彬 黄性涛 贾卢魁 季晓斌 李海波 李卫东 梁羽铁 刘春秀 刘怀民 刘颖 刘勇 罗涛 吕绮雯 马秋梅 马想 冒亚军 毛泽普 莫晓虎 宁飞鹏 平荣刚 邱进发 宋文博 孙胜森 孙晓东 孙永昭 田浩来 王纪科 王亮亮 文硕频 伍灵慧 吴智 谢宇广 言杰 严亮 姚剑 苑长征 袁野 张长春 张建勇 张雷 张学尧 张瑶 郑阳恒 朱永生 邹佳恒 《中国物理 C》2009,33(6):428-435
This paper focuses mainly on the vertex reconstruction of resonance particles with a relatively long lifetime such as Ks^0, A, as well as on lifetime measurements using a 3-dimensional fit. The kinematic constraints between the production and decay vertices and the decay vertex fitting algorithm based on the least squares method are both presented. Reconstruction efficiencies including experimental resolutions are discussed. The results and systematic errors are calculated based on a Monte Carlo simulation. 相似文献
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梁羽铁 刘坤 尤郑昀 冒亚军 李卫东 边渐鸣 曹国富 曹学香 陈申见 邓子艳 傅成栋 高原宁 韩磊 韩少卿 何康林 何苗 胡继峰 胡小为 黄彬 黄性涛 贾卢魁 季晓斌 李海波 刘北江 刘春秀 刘怀民 刘颖 刘勇 罗涛 吕绮雯 马秋梅 马想 毛泽普 莫晓虎 宁飞鹏 平荣刚 邱进发 宋文博 孙胜森 孙晓东 孙永昭 田浩来 王纪科 王亮亮 文硕频 伍灵慧 吴智 谢宇广 徐敏 言杰 严亮 姚剑 苑长征 袁野 张长春 张建勇 张雷 张学尧 张瑶 郑阳恒 朱永生 邹佳恒 《中国物理 C》2009,33(8):666-672
The reconstruction algorithm for BESⅢ Muon Counter, MucRecAlg, is developed with the objectoriented language C++ in BESⅢ offine software environment. MucRecAlg consists of the following functions:to find track seeds either from extrapolation of tracks in the main drift chamber or from the fired strips in muon counter, to select fired strips associated to the candidate tracks, to fit the candidate tracks with a linear or quadratic function and to calculate other parameters of the tracks for muon identification. Monte Carlo samples are generated to check the performance of the reconstruction package, such as reconstruction effciency, muon remaining rate and pion rejection rate, etc. The preliminary results show that the pion rejection rate is around 3%—4% while the muon remaining rate is better than 90% in 0.4—1.6 GeV/c momentum region, which meets the requirement as shown in the design report. 相似文献