Speaker
Mr
Muhammad Ahmad
(IHEP)
Description
The properties of a Higgs boson candidate are measured in the H→ZZ→4ℓ decay channel, with ℓ=e,μ, using data from pp collisions corresponding to an integrated luminosity of 5.1 fb−1 at center-of-mass energy of √s = 7 TeV ,19.7 fb−1 at √s = 8 TeV and 10.0 fb^-1 at √s = 13 TeV recorded with the CMS detector at the LHC. The new boson is observed as a narrow resonance with a local significance of 6.8 standard deviations, a measured mass of 125.6 ±± 0.4 (stat.) ±± 0.2 (syst.) GeV, and a total width less than 3.4 GeV at a 95% confidence level(Run 1 data). Differential fiducial cross section measurement are measured and compared with Standard Model theoratical pridiction and no significant deviation observed (RUN 1 data). Its spin-parity properties are found to be consistent with the expectations for the standard model Higgs boson (Run 1 data). The hypotheses of a pseudoscalar and all tested spin-one boson hypotheses are excluded at a 99% confidence level or higher. All tested spin-two boson hypotheses are excluded at a 95% confidence level or higher. Differential fiducial cross section measurement will also be presented using RUN 2 data.
Primary author
Mr
Muhammad Ahmad
(IHEP)
