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arXiv 1409.2646hep-ex
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CMS上$H\to ZZ \to 4\ell$衰变道中希格斯玻色子性质的最新研究

Recent Results on the Higgs Boson Properties in the $H\to ZZ \to 4\ell$ decay channel at CMS

Linda Finco

摘要:

本文报道了125 GeV左右新玻色子性质测量的最新结果。该分析使用由CMS探测器在LHC记录的pp碰撞数据,对应于在$\sqrt{s}$ = 7 TeV时的5.1 $fb^{-1}$和在$\sqrt{s}$ = 8 TeV时的19.6 $fb^{-1}$的积分亮度。在$H \to ZZ \to 4\ell$通道($\ell = e, μ$)中观察到玻色子,并测量其质量,给出了迄今为止最精确的结果。此外,第一个实验约束希格斯粒子的总宽度使用$H \to ZZ \to 4\ell$事件,设置上限为33 MeV的95\%的置信水平(42 MeV的预期)。研究了玻色子的自旋宇称,并与其他自旋宇称假设进行了比较,发现纯标量假设与观测结果是一致的。在95%置信水平上,没有发现其它显著的标准模型类Higgs过剩,上限不包括129.5 - 832.0 GeV。

英文摘要:

The latest results on the measurement of the properties of the new boson with mass around 125 GeV are reported. The analysis uses pp collision data recorded by the CMS detector at the LHC, corresponding to integrated luminosities of 5.1 $fb^{-1}$ at $\sqrt{s}$ = 7 TeV and 19.6 $fb^{-1}$ at $\sqrt{s}$ = 8 TeV. The boson is observed in the $H \to ZZ \to 4\ell$ channel ($\ell = e, μ$) and its mass is measured, giving the most precise result ever achieved. Moreover, the first experimental constraint on Higgs total width using $H \to ZZ \to 4\ell$ events is presented, setting an upper limit of 33 MeV at 95\% confidence level (42 MeV expected). The spin-parity of the boson is studied and the pure scalar hypothesis is found to be consistent with the observation, when compared to the other spin-parity hypotheses. No other significant Standard Model Higgs-like excess is found in the search and upper limits at 95\% condence level exclude the range 129.5 -832.0 GeV.

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。

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