Study of vertex optimization at the CEPC

Study of vertex optimization at the CEPC
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CEPC顶点优化研究

DOI:
10.1088/1748-0221/13/09/t09002
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发表时间:
2018-09
期刊:
JINST
影响因子:
--
通讯作者:
M. Ruan
M. Ruan
中科院分区:
其他
文献类型:
--
作者:
Z. Wu;G. Li;C. Fu;D. Yu;Q. Ouyang;M. Ruan

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CEPC 是一个计划中的未来对撞机,旨在精确测量希格斯玻色子特性。其核心物理程序包括Br(H→ bb)、Br(H→ cc)和Br(H→ τ+τ−)的确定,其精度对顶点(VTX)设计和性能敏感。这项研究是针对 √s = 240 GeV 的希格斯致辐射事件 e+e−→ ZH 进行的,随后希格斯衰变为 bb、cc 和 ττ。通过完整模拟,我们量化了这些物理性能与主要 VTX 几何参数之间的依赖性:内半径、材料预算和空间分辨率。我们选择了三种基准 VTX 设计,一种是根据升级后的 ALICE 内部跟踪系统 (ITS) 几何结构的保守设计,一种是比升级后的 ALICE ITS 大约好两倍的基线探测器设计,另一种是大约比升级后的 ALICE ITS 好四倍的激进设计。将激进设计的物理性能与基线设计进行比较,我们发现 Br(H→ cc) 测量极其灵敏,相对精度可能变化高达 40%。 Br(H→ τ+τ−) 的相对精度变化了 8%。 Br(H→ bb) 对 VTX 参数并不真正敏感,相对精度仅变化 1%。我们的分析还表明,减小内半径是提高 Br(H→ cc) 测量性能的最有效方法。
The CEPC is a planned future collider targeting precise Higgs property measurements. Its core physics program includes the determination of Br(H→ bb), Br(H→ cc), and Br(H→ τ+τ−), whose accuracies are sensitive to the vertex (VTX) design and the performance. This study is performed on Higgsstrahlung events e+e−→ ZH at √s = 240 GeV, with subsequent Higgs decay to bb, cc and ττ. Using full simulation, we quantified the dependency between these physics performances and the main VTX geometry parameters: the inner radius, the material budget, and the spatial resolution. We select three benchmark VTX designs, a conservative design according to the upgraded ALICE Inner Tracker System (ITS) geometry, a baseline detector design that is roughly two times better than the upgraded ALICE ITS, and an aggressive design that is roughly four times better. Comparing the physics performance at the aggressive design to the baseline one, we found the Br(H→ cc) measurement is extremely sensitive and the relative accuracy could change up to 40%. The relative accuracy on Br(H→ τ+τ−) changes by 8%. The Br(H→ bb) is not really sensitive to the VTX parameters and the relative accuracy only changes by 1%. Our analyses also show that the reduction of the inner radius is the most efficient way to improve the performance on Br(H→ cc) measurements.
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