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2018年6月27日至7月1日，BESⅢ国际合作组2018年夏季会议在中国科学院高能物理研究所举办。来自北京大学等18家国内合作单位和来自德国、意大利、俄罗斯、瑞典、英国、美国、巴基斯坦等国外合作单位的一百多名学者和研究生参加了会议。会议由BESⅢ国际合作组发言人苑长征研究员主持。
Using ~14×106 ψ(2S) and ~58×106 J/ψ data collected at BESⅡ/BEPC, the branching fraction of ψ(2S)→Ω－Ω+ is measured with about 5σ statistical significance. The Λ electric dipole and Λ decay parameter ar...
Recent results on hadron spectroscopy from BES
light hadrons BES X(1860) Y(2175) κ± N*(2065)
2010/5/7
The BES-Ⅲ Detector is a very versatile multipurpose device located at the Institute of High Energy Physics (IHEP) in Beijing, China. Concerning the physics program it ties stringently up to the past B...
Physics program of open charm and heavy cc states at the BES-Ⅲ experiment
D semileptonic decays D+(s) purely leptonic decays CKM matrix elements Standard Model D0D0 mixing CP violation in D decays
2010/5/7
We present the physics program of the open charm and heavy cc states above the DD production energy threshold, which will be studied with the BES-Ⅲ detector at the BEPC-Ⅱ collider in the coming years....
Overveiw of the BES physics
Decays of J/ψ charmonium baryon
2009/11/17
Recent physics results at Beijing Electron-Positron Collider (BEPC) are reviewed, especially on excited baryons. Substantial improvements are expected at the newly built BESIII experiment, which is o...
BESⅢ track fitting algorithm
BESⅢ main drift chamber track fitting algorithm Kalman filter method
2009/9/17
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 detecto...
Monte Carlo study on the low momentum μ-π identification of the BESⅢ EM calorimeter
BESⅢ calorimeter particle identification artificial neural network
2009/9/17
The BESⅢ detector has a high-resolution electromagnetic calorimeter which can be used for low momentum μ-π identification. Based on Monte Carlo simulations, μ-π separation was studied. A multilayer pe...
BES主漂移室模型性能的束流测试
束流测试 模型性能 BES主漂移室
2009/8/17
本文描述了北京谱仪BES主漂移室一个多层多单元模型的结构, 给出在日本KEK12GeV质子同步加速器K2试验束上, 利用动量0.5～1.5GeV/c的e+,π+和p束测量模型性能的主要结果. 在3.1cm的单元半宽内, 室的单丝空间分辨率σx=170～210μm. 相当四十次dE/dx取样的能量分辨率σE/E约为15%, 提供了北京谱仪工作能区鉴别粒子的一种有效方法, 可同飞行时间(TOF)计数器...
BES端盖簇射计数器模型的束流测试
束流测试 计数器模型 BES端盖簇射
2009/8/17
研制并测试了一台铅板和自猝灭流光管夹层式的气体取样簇射计数器. 计数管使用了铝方管和阳极丝读出. 能量分辨σ/E在Ee=1GeV时达15.5%, 能量响应范围是0—2GeV. 本文描述了束流测试的方法和计数器模型的各种性能.
BES桶部簇射计数器模型束流测试的初步结果
BES桶部簇射 束流测试 计数器模型
2009/8/17
在日本KEK的12GeV质子同步加速器上, 用动量为0.2GeV/c至2.0GeV/c的电子和π介子束流对BES桶部簇射计数器模型进行了测试, 本文报告数据分析的初步结果. 测试了四种混合气体下模型的性能, 测试结果表明, 用自猝灭流光管作为取样型电磁簇射计数器的取样方式, 在BEPC对撞机的能量范围内是可行的. 文章同时还报告了基于取样保持电路和BADC的120路在线数据获取系统在连续两个月束流...
The recent observations of the purely leptonic decay Ds+→μ+νμ and τ+ντ at CLEO-c and B factory may allow a possible contribution from a charged Higgs boson. One such measurement of the decay constant ...
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 generat...
Search for exotic state 1－+ π1(1400) at BESⅢ
1－+ exotic state π1(1400) covariant helicity-coupling amplitudes partial wave analysis
2009/8/14
The J/ψ hadronic decays provide good laboratory to search for the hybrid states with exotic quantum numbers. A full Partial Wave Analysis (PWA) is performed to the generated Monte Carlo J/ψ→ρηπ data,...
Significance of absolute energy scale for physics at BESⅢ
absolute energy calibration τ mass cross section scan error estimation
2009/8/14
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 determinat...