共查询到20条相似文献,搜索用时 0 毫秒
1.
An introduction for ηc physics research is presented in this paper, which shows that the meachnism of ηc decays can't be well described by current theoretical models and detailed experimental measurements need to be done with larger ηc sample. Based on the expected J/ψ and ψ′events taken with the planed BESⅢ detector in one year, the ηc physics researches are discussed extensively, including the measurements of branching fractions of different final states, the search for new decay modes, precision measurements of mass and width, and the search for rare decays. At last, the study of η′c decays is also discussed briefly. 相似文献
2.
BES Collaboration 《中国物理C(英文版)》1999,23(2):97-102
Based on 9.0×106 J/ψ data collected at BES, a systematic physics analysis has been Performed. We confirmed the existence of ξ(2230) in J/ψ→γKK and observed for the first time the non-strange decay modes ξ(2230)→π+π-,π0π0,and pp. The resonance and polarization parameters of f0(980) and f2(1270) were measured. The moment stUdy on J/ψ→γK+K- revealed that the controversial fJ,(1710) is composed of two states, a 0++ and a 2++. With the help of PWA method, the spin-Parities for η(1440) and f0(1500) were obtained, and their main decay modes were found. 相似文献
3.
The principle of the method for the BESⅢ event start time determination and the code construction are described. The investigation of influence of the noise, the method of rejecting noise and the performance checking by the Monte Carlo physics data sample are also presented. The preliminary results got from the Monte Carlo simulation are presented, the reconstruction efficiency of J/ψ→ anything events at noise level 0~60% can achieve above 99%, and the error rate is below 1%. 相似文献
4.
谢宇广 李卫东 梁羽铁 尤郑昀 冒亚军 张家文 边渐鸣 曹国富 曹学香 陈申见 邓子艳 傅成栋 高原宁 何康林 何苗 花春飞 黄彬 黄性涛 季晓斌 李飞 李海波 刘春秀 刘怀民 刘秋光 刘锁 刘英杰 马秋梅 马想 毛泽普 莫晓虎 潘明华 庞彩莹 平荣刚 秦亚红 邱进发 孙胜森 孙永昭 王纪科 王亮亮 文硕频 伍灵慧 徐敏 严亮 苑长征 袁野 张炳云 张长春 张建勇 张学尧 张瑶 郑阳恒 朱科军 朱永生 朱志丽 邹佳恒 《中国物理 C》2010,34(3):344-353
The calibration algorithm for RPC-based muon detector at BESIII has been developed. The calibration method, calibration error and algorithm performance are studied. The primary results of efficiency and noise at layer, module and strip levels have been calibrated with cosmic ray data. The calibration constants are available for simulation and reconstruction tuning. The results of Monte Carlo and data are also compared to check the validation and reliability of the algorithm. 相似文献
5.
XIE Yu-Guang LI Wei-Dong LIANG Yu-Tie YOU Zheng-Yun MAO Ya-Jun ZHANG Jia-Wen BIAN Jian-Ming CAO Guo-Fu CAO Xue-Xiang CHEN Shen-Jian DENG Zi-Yan FU Cheng-Dong GAO Yuan-Ning HE Kang-Lin HE Miao HUA Chun-Fei HUANG Bin HUANG Xing-Wao JI Xiao-Bin LI Fei LI Hai-Bo LIU Chun-Xiu LIU Huai-Min LIU Qiu-Guang LIU Suo LIU Ying-Jie MA Qiu-Mei MA Xiang MAO Ze-Pu MO Xiao-Hu PAN Ming-Hua PANG Cai-Ying PING Rong-Gang QIN Ya-Hong QIU Jin-Fa SUN Sheng-Sen SUN Yong-Zhao WANG Ji-Ke WANG Liang-Liang WEN Shuo-Pin WU Ling-Hui XU Min YAN Liang YUAN Chang-Zheng YUAN Ye ZHANG Bing-Yun ZHANG Chang-Chun ZHANG Jian-Yong ZHANG Xue-Yao ZHANG Yao ZHENG Yang-Heng ZHU Ke-Jun ZHU Yong-Sheng ZHU Zhi-Li ZOU Jia-Heng 《中国物理C(英文版)》2010,34(3)
The calibration algorithm for RPC-based muon detector at BESⅢ has been developed. The calibration method, calibration error and algorithm performance are studied. The primary results of efficiency and noise at layer, module and strip levels have been calibrated with cosmic ray data. The calibration constants are available for simulation and reconstruction tuning. The results of Monte Carlo and data are also compared to check the validation and reliability of the algorithm. 相似文献
6.
Recently, the LHCb experiment announced 3.5σ evidence for direct CP violation in D0 decay by looking at the difference between ACP(D0→K+K-) and ACP(D0→π+π-). This is the rst evidence of CP violation in a charm system, which may indicate new physics beyond the Standard Model. Motivated by this measurement, we review rare processes in charmonium decay, especially, the weak decay, C or P violated decay, and lepton avor violated decays. In case the new physics appears in charm sector, these rare decays of charmonium states will provide an opportunity to search for signi cant contributions from physics beyond the Standard Model. With huge J/ψ and ψ(2S) samples in BES0 experiment, the rare decays may be feasible. 相似文献
7.
8.
A multi-variable particle identification method is developed for the BESⅡ physics analysis. Besides the traditionally used TOF-T and dE/dx information, TOF-Q and BSC-E are also used to improve the particle discrimination ability. It is shown that the particle identification efficiency, misidentification probability and systematic error could be improved with this new method. The multi-variable method can be extended to even more variables, and can be used in other experiments. 相似文献
9.
The installation of the BESⅢ RPC system has been completed. Cosmic ray test results show that they perform very well in streamer mode and meet the BESⅢ requirements. We have tested several RPCs in the avalanche mode with the addition of extra SF6 in the gas mixture. We find an efficiency plateau that reaches ~95%, and a time resolution of 1.8 ns. This demonstrates that the BESⅢ-type RPC can work in the avalanche mode as well. 相似文献
10.
The number of ψ’ events accumulated by the BESⅢ experiment from March 3 through April 14, 2009, is determined by counting inclusive hadronic events. The result is 106.41×(1.00±0.81%)×106 . The error is systematic dominant; the statistical error is negligible. 相似文献
11.
N.Berger ZHU Kai LIU Zhen-An JIN Da-Peng XU Hao GONG Wen-Xuan WANG Ke CAO Guo-Fu 《中国物理C(英文版)》2010,34(12)
Trigger efficiencies at BESⅢ were determined for both the J/ψ and ψ' data taking of 2009. Both dedicated runs and physics datasets are used; efficiencies are presented for Bhabha-scattering events, generic hadronic decay events involving charged tracks, dimuon events and ψ'→π+π-J/ψ, J/ψ→ 1+1- events.The efficiencies are found to lie well above 99% for all relevant physics cases, thus fulfilling the BESⅢ design specifications. 相似文献
12.
Trigger efficiencies at BESⅢ were determined for both the J/ψ and ψ' data taking of 2009. Both dedicated runs and physics datasets are used; efficiencies are presented for Bhabha-scattering events, generic hadronic decay events involving charged tracks, dimuon events and ψ'→π+π-J/ψ, J/ψ→ 1+1- events.The efficiencies are found to lie well above 99% for all relevant physics cases, thus fulfilling the BESⅢ design specifications. 相似文献
13.
Event generators at BESⅢ 总被引:1,自引:0,他引:1
We present a brief remark and introduction to event generators for tau-charm physics currently used at BESⅢ, including KKMC, BesEvtGen, Bhlumi, Bhwide, Babayaga and inclusive Monte-Carlo event generators. This paper provides basic information on event generators for BESⅢ users. 相似文献
14.
M. Ablikim et al. 《中国物理C(英文版)》2013,37(6):063001-063001
The number of ψ' events accumulated by the BESⅢ experiment from March 3 through April 14, 2009, is determined by counting inclusive hadronic events. The result is 106.41×(1.00±0.81%)×106 . The error is systematic dominant; the statistical error is negligible. 相似文献
15.
WANG Ji-Ke MAO Ze-Pu BIAN Jian-Ming CAO Guo-Fu CAO Xue-Xiang CHEN Shen-Jian DENG Zi-Yan FU Cheng-Dong GAO Yuan-Ning HE Kang-Lin HE Miao HUA Chun-Fei HUANG Bin HUANG Xing-Tao JI Xiao-Sin LI Fei LI Hai-Bo LI Wei-Dong LIANG Yu-Tie LIU Chun-Xiu LIU Huai-Min LIU Suo LIU Ying-Jie MA Qiu-Mei MA Xiang MAO Ya-Jun MO Xiao-Hu PAN Ming-Hua PANG Cai-Ying PING Rong-Gang QIN Ya-Hong QIU Jin-Fa SUN Sheng-Sen SUN Yong-Zhao WANG Liang-Liang WEN Shuo-Pin WU Ling-Hui XIE Yu-Guang XU Min YAN Liang YOU Zheng-Yun YUAN Chang-Zheng YUAN Ye ZHANG Bing-Yun ZHANG Chang-Chun ZHANG Jian-Yong ZHANG Xue-Yao ZHANG Yao ZHENG Yang-Heng ZHU Ke-Jun ZHU Yong-Sheng ZHU Zhi-Li ZOU Jia-Heng 《中国物理C(英文版)》2009,33(10)
A track fitting algorithm based on the Kalman filter method has been developed for BESⅢ of BEPCⅡ.The effects of multiple scattering and energy loss when the charged particles go through the detector,non-uniformity of magnetic field (NUMF) and wire sag, etc., have been carefully handled.This algorithm works well and the performance satisfies the physical requirements tested by the simulation data. 相似文献
16.
A track fitting algorithm based on the Kalman filter method has been developed for BESⅢ of BEPCⅡ. The effects of multiple scattering and energy loss when the charged particles go through the detector, non-uniformity of magnetic field (NUMF) and wire sag, etc., have been carefully handled. This algorithm works well and the performance satisfies the physical requirements tested by the simulation data. 相似文献
17.
PING Rong-Gang 《中国物理C(英文版)》2008,32(8):599-602
We present a brief remark and introduction to event generators for tau-charm physics currently used at BESⅢ,including KKMC,BesEvtGen,Bhlumi,Bhwide,Babayaga and inclusive Monte-Carlo event generators.This paper provides basic information on event generators for BESⅢ users. 相似文献
18.
《中国物理C(英文版)》2017,(5)
A fast physics analysis framework has been developed based on SNi PER to process the increasingly large data sample collected by BESⅢ.In this framework,a reconstructed event data model with Smart Ref is designed to improve the speed of Input/Output operations,and necessary physics analysis tools are migrated from BOSS to SNi PER.A real physics analysis e~+e~-→π~+π~-J/ψ is used to test the new framework,and achieves a factor of10.3 improvement in Input/Output speed compared to BOSS.Further tests show that the improvement is mainly attributed to the new reconstructed event data model and the lazy-loading functionality provided by Smart Ref. 相似文献
19.
WANG Da-Yong LIU Zhen-An JIN Da-Peng XU Hao ZHAO Di-Xin GUO Ya-Nan LI Wei-Guo 《中国物理C(英文版)》2005,29(2):168-174
Based on the detector and trigger simulation of beijing spectrometer Ⅲ (besⅢ), schemes of besⅢ emc triggers are studied. neutral triggers, bhabha triggers and charged event triggers are designed to fulfill the requirements of the physics goals. the trigger parameters are optimized and the ability of backgrounds rejection are carefully studied. trigger simulation for some typical physics channels are studied and the expected backgrounds event rates are obtained 相似文献
20.
The effects of absolute energy calibration on BESⅢ physics are discussed in detail, which mainly involve the effects on τ mass measurement, cross section scan measurement, and generic error determination in other measurements. 相似文献