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Trigger efficiencies at BES III were determined for both the J/psi and psi' data taking of 2009. Both dedicated runs and physics datasets are used; efficiencies are presented for Bhabha-scattering eve...
Trigger efficiencies at BES III 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.
Study of a0(980)-f0(980) mixing at BES III and study of charged kappa at BES II
(980)-f0(980) charged kappa at BES II
2011/1/5
Recent BES results on light scalars are reported in this talk, including the observation of a charged k± decaying to K±p 0 with 5.8×107 J/y data at BES II and the directmeasurements of a00 (980)−...
BES III漂移室边界场丝层补偿电压的研究
漂移室 X-T关系 边界丝层 BESⅢ
2009/7/8
BESⅢ漂移室边界丝层单元存在着严重的X-T关系左右不对称问题, 模拟研究表明在边界场丝层上设置适当的补偿电压能很有效地减小这种不对称. 通过BESⅢ漂移室模型的束流测试验证了边界场丝层补偿电压方案对减小X-T关系左右不对称的有效性, 同时还研究了补偿电压对边界丝层单元空间分辨及dE/dx测量的影响.
2008年7月19日，北京正负电子对撞机（BEPC-II）和北京谱仪(BES-III)重大改造工程取得重要进展，加速器与北京谱仪联合调试对撞成功，观察到了正负电子对撞产生的物理事例（见下图）。这是升级工程的重要里程碑。加速器和探测器工作性能稳定，对撞亮度不断提高，已经实现了20团电子和20团正电子的对撞，正在进一步调试，最后将增加到93对正负电子团的对撞，连同其他技术措施，将使亮度这一对撞机的重要...