Luminosity monitoring and calibration of BLM
Luminosity monitoring and calibration of BLM
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DOI：
10.1088/1674-1137/35/1/001
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发表时间：
2011
影响因子：
3.6
通讯作者：
-薛镇;-薛镇;Z. Xue;Zi-zong Xu;X. Wang;T. Hu;Z. Wang;C. Fu;Wei Yan;J. Lu;L. Zhou;X. Cai-X.-Ca
中科院分区：
文献类型：
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作者：
-薛镇;-薛镇;Z. Xue;Zi-zong Xu;X. Wang;T. Hu;Z. Wang;C. Fu;Wei Yan;J. Lu;L. Zhou;X. Cai-X.-Ca
BEPC II发光度监测器(BLM)监测每束的相对发光度。得到了与pSi(3770)共振质心系统能量BLM的光度成正比的伽马光子计数率，统计误差为0.01%，系统误差为4.1%。绝对亮度也是由BESIII端盖电磁量热仪(EEMC)使用Bhabha事件确定的，统计误差为2.3%，系统误差为3.5%。用EEMC获得的光度与BLM的计数速率之间的校准常数为0.84+/-0.03(x10(26)cm(-2).count(-1))。有了校准常数，BLM的计数速率可以放大到绝对亮度。
The BEPC II Luminosity Monitor (BLM) monitors relative luminosity per bunch. The counting rates of gamma photons, which are proportional to the luminosities from the BLM at the center of mass system energy of the psi(3770) resonance, are obtained with a statistical error of 0.01% and a systematic error of 4.1%. Absolute luminosities are also determined by the BESIII End-cap Electro-Magnetic Calorimeter (EEMC) using Bhabha events with a statistical error of 2.3% and a systematic error of 3.5%. The calibration constant between the luminosities obtained with the EEMC and the counting rates of the BLM are found to be 0.84 +/- 0.03 (x10(26) cm(-2).count(-1)). With the calibration constant, the counting rates of the BLM can be scaled up to absolute luminosities.