Properties of the Higgs-like boson in the H → ZZ → 4?decay channel at CMS

摘要

The measurement of the properties of the new boson with mass around 126 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 √s = 7TeV and 19.6 fb~(-1) at √s= 8TeV. The boson is observed in the H → ZZ →4? channel (? = e, μ) with a local significance above the expected background of 6.8 standard deviations. The mass is measured to be 125.6 ± 0.4(stat.) ± 0.2(syst.) GeV. 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% confidence level exclude the range 129.5-832.0 GeV.