Measurement of the properties of a Higgs boson in the four-lepton final state
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چکیده
The properties of a Higgs boson candidate are measured in the H → ZZ → 4` decay channel, with ` = e, μ, using data from pp collisions corresponding to an integrated luminosity of 5.1 fb−1 at the center-of-mass energy of √ s = 7 TeV and 19.7 fb−1 at √ s = 8 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≤ 3.4 GeV at the 95% confidence level. The production cross section of the new boson times its branching fraction to four leptons is measured to be 0.93+0.26 −0.23 (stat.) +0.13 −0.09 (syst.) times that predicted by the standard model. Its spin-parity properties are found to be consistent with the expectations for the standard-model Higgs boson. The hypotheses of a pseudoscalar and all tested spin-1 boson hypotheses are excluded at the 99% confidence level or higher. All tested spin-2 boson hypotheses are excluded at the 95% confidence level or higher. Published in Physical Review D as doi:10.1103/PhysRevD.89.092007. c © 2014 CERN for the benefit of the CMS Collaboration. CC-BY-3.0 license ∗See Appendix A for the list of collaboration members ar X iv :1 31 2. 53 53 v3 [ he pex ] 1 0 Ju n 20 14
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Article history: Received 4 July 2017 Received in revised form 29 September 2017 Accepted 10 October 2017 Available online 16 October 2017 Editor: M. Doser
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