An inference method of the luminosity spectrum in a future e+e− linear collider
- 作者：Akihiro Shibata ; Setsuya Kawabata ; Junpei Fujimoto ; Yoshimasa Kurihara ; Takashi Watanabe
- 关键词：Luminosity spectrum ; Linear collider ; EM algorithm
- 刊名：Physics Letters B
- 出版年：2007
- 期刊代码：58_03702693
- 类别：ph
- 出版时间：1 February 2007
- 卷：645
- 期：1
- 页码：12-18
- 文件大小：523 K
摘要
The high-luminosity e+e− linear collider has been studied as an energy frontier future project in high energy physics, and is expected to be a good place for the precision experiments. The high-luminosity e+e− linear collider no longer produces a monochromatic energy spectrum in the center of mass system, but a continuous and rather broad energy spectrum due to beamstrahlung of colliding e+ and e− beams. Without precise knowledge of this energy spectrum alias the luminosity spectrum, the precision experiment in the linear collider should be confronted with a crucial problem. A statistical method based on new developments in information technology is examined with a view of determining the luminosity spectrum. A statistical model is formulated and a likelihood fitting is carried out to determine the luminosity spectrum by using Bhabha events. The e+ and e− beam parameters, describing the luminosity spectrum, can be determined with an uncertainty of several percent by using 10 k Bhabha events under an ideal detector condition.