arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1601.05352hep-exhep-ph
收藏

在CEPC用Higgsstrahlung测量截面和Higgs质量

Cross Section and Higgs Mass Measurement with Higgsstrahlung at the CEPC

Zhenxing Chen, Ying Yang, Manqi Ruan, Dayong Wang, Gang Li, Shan Jin, Yong Ban

摘要:

环形正负电子对撞机(CEPC)是中国高能物理界提出的未来希格斯工厂。它的质心能量为240-250 GeV。CEPC将在十年的运行中积累5 ab $^{\rm{-1}}$的积分亮度,通过希格斯辐射和矢量玻色子融合过程产生100万个希格斯玻色子。这个样本允许百分之一甚至百分之一级的希格斯玻色子耦合的确定。利用GEANT 4全模拟和专用快速模拟工具,对CEPC $Z\rightarrowμ^+μ^-$通道的Higgstrahlung截面$σ_{ZH}$和Higgs质量$m_{H}$测量的统计精度进行了评估。在仅利用Z玻色子衰变信息的模型无关分析中,$σ_{ZH}$($m_{H}$)测量的统计精度可达0 97%(6 9 MeV)。对于标准模型的Higgs玻色子,加入Higgs衰变的信息后,$m_{H}$的计算精度可以提高到5.4 MeV. TPC的大小对这些测量的影响进行了研究。此外,我们研究了在CEPC测量希格斯玻色子衰变到不可见的最终状态的前景。以标准模型$ZH$的产率,在95%置信水平下,${\cal B}(H\rightarrow \rm{inv.})$的上限可达1.2%。

英文摘要:

The Circular Electron Positron Collider (CEPC) is a future Higgs factory proposed by the Chinese high energy physics community. It will operate at a center-of-mass energy of 240-250 GeV. The CEPC will accumulate an integrated luminosity of 5 ab$^{\rm{-1}}$ in ten years' operation, producing one million Higgs bosons via the Higgsstrahlung and vector boson fusion processes. This sample allows a percent or even sub-percent level determination of the Higgs boson couplings. With GEANT4-based full simulation and dedicated fast simulation tool, we evaluated the statistical precisions of the Higgstrahlung cross section $σ_{ZH}$ and the Higgs mass $m_{H}$ measurement at the CEPC in the $Z\rightarrowμ^+μ^-$ channel. The statistical precision of $σ_{ZH}$ ($m_{H}$) measurement could reach 0.97\% (6.9 MeV) in the model-independent analysis which uses only the information of Z boson decay. For the standard model Higgs boson, the $m_{H}$ precision could be improved to 5.4 MeV by including the information of Higgs decays. Impact of the TPC size to these measurements is investigated. In addition, we studied the prospect of measuring the Higgs boson decaying into invisible final states at the CEPC. With the standard model $ZH$ production rate, the upper limit of ${\cal B}(H\rightarrow \rm{inv.})$ could reach 1.2\% at 95\% confidence level.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑