CEPC光度测量的光束扩展确定
Beam-spread determination for luminosity measurement at CEPC
摘要：
碰撞束能量的任何不对称性将导致碰撞粒子的质心坐标系w.r.t.实验室框架，并因此在光度计的计数损失，由于损失的共线性的Bhabha最终状态。在Z0极点运行的CEPC中，应知道碰撞束能量的不对称性以及束扩展的12.5%，以便将Bhabha计数的不确定性控制在0.01%的水平。在这里，我们讨论的方法，最初提出的FCCee，以确定从测量的有效质心能量在$e^+e^- \to μ^+μ^-$碰撞的光束扩展的变化。
英文摘要：
Any asymmetry in energy of the colliding beams will lead to a longitudinal boost of the center-of-mass frame of colliding particles w.r.t. the laboratory frame and consequently to the counting loss in luminometer due to the loss of colinearity of Bhabha final states. At CEPC running at the Z0 pole, asymmetry in energy of the colliding beams should be known as well as 12.5% of the beam-spread, in order to control the uncertainty of Bhabha count at the level of 0.01%. Here we discuss the method, initially proposed for FCCee, to determine variation of the beam-spread from the measurement of the effective center-of-mass energy in $e^+e^- \to μ^+μ^-$ collisions.
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