Updated results on the new boson discovered in the search for the standard model Higgs boson in the ZZ to 4 leptons channel in pp collisions at sqrt(s) = 7 and 8 TeV (original) (raw)

CMS Physics Analysis Summaries
Report number	CMS-PAS-HIG-12-041
Title	Updated results on the new boson discovered in the search for the standard model Higgs boson in the ZZ to 4 leptons channel in pp collisions at sqrt(s) = 7 and 8 TeV
Corporate author(s)	CMS Collaboration
Collaboration	CMS Collaboration
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; CMS
Abstract	Measurements of the properties of the new boson recently observed at a mass near 125 GeV in the CMS experiment are reported. The results are obtained from a comprehensive search for the standard model Higgs boson in the H rightarrow\rightarrowrightarrow ZZ decay channel, where both Z's decay to electron, muon, or tau lepton pairs. The search covers Higgs boson mass hypotheses in the range 110<mH<1000110 < m_H < 1000110<mH<1000 GeV. The analysis uses pp collision data recorded by the CMS detector at the LHC, corresponding to integrated luminosities of 5.1 rmfb−1{\rm fb}^{-1}rmfb−1 at sqrts=7\sqrt{s} = 7sqrts=7 TeV and 12.2 rmfb−1{\rm fb}^{-1}rmfb−1 at sqrts=8\sqrt{s}= 8sqrts=8 TeV. The new boson is observed with a local significance above the expected background of 4.5 standard deviations. The signal strength mu\mumu, relative to the expectation for the standard model Higgs boson, is measured to be mu=0.80+0.35−0.28\mu = 0.80^{+ 0.35}_{-0.28}mu=0.80+0.35−0.28 at 126 GeV. A measurement of its mass gives 126.2pm0.6126.2 \pm 0.6126.2pm0.6 (stat) pm0.2\pm 0.2pm0.2 (syst)~GeV. The hypothesis 0+0^+0+ of the standard model for the spin J=0J=0J=0 and parity P=+1P=+1P=+1 quantum numbers is found to be consistent with the observation. Under the assumption that the observed boson has spin zero the data disfavor the pseudoscalar hypothesis 0−0^-0− with a mathrmCLs\mathrm{CL_s}mathrmCLs value of 2.4\%. No other significant excess is found, and upper limits at 95\% confidence level exclude the ranges 113--116 GeV and 129--720 GeV while the expected exclusion range for the standard model Higgs boson is 118--670 GeV.
Other source	Inspire
Related	superseded by: CERN-PH-EP-2012-372
Email contact: cms-pag-conveners-higgs@cern.ch Fulltext in PDF Figure_001-a Figure_001-b Figure_002-a Figure_002-b Figure_003-a Figure_003-b Figure_004-a Figure_004-b Figure_005-a Figure_005-b Figure_006-a Figure_006-b Figure_007 Figure_008-a Figure_008-b Figure_009-a Figure_009-b Additional information for the analysis (restricted access)

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Record created 2012-11-16, last modified 2018-06-15