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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
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 $\rightarrow$ ZZ decay channel, where both Z's decay to electron, muon, o...
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2012
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Acceso en línea: | http://cds.cern.ch/record/1494488 |
_version_ | 1780926549691727872 |
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author | CMS Collaboration |
author_facet | CMS Collaboration |
author_sort | CMS Collaboration |
collection | CERN |
description | 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 $\rightarrow$ 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 $110 < m_H < 1000$ GeV.
The analysis uses pp collision data recorded by the CMS detector at the LHC,
corresponding to integrated luminosities of 5.1 ${\rm fb}^{-1}$ at $\sqrt{s} = 7$ TeV
and 12.2 ${\rm fb}^{-1}$ at $\sqrt{s}= 8$ TeV.
The new boson is observed with a local significance
above the expected background of 4.5 standard deviations.
The signal strength $\mu$, relative to the expectation for the standard model Higgs boson,
is measured to be $\mu = 0.80^{+ 0.35}_{-0.28}$ at 126 GeV.
A measurement of its mass gives $126.2 \pm 0.6$ (stat) $\pm 0.2$ (syst)~GeV.
The hypothesis $0^+$ of the standard model for the spin $J=0$ and parity $P=+1$ 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 $0^-$ with a $\mathrm{CL_s}$ 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. |
id | cern-1494488 |
institution | Organización Europea para la Investigación Nuclear |
publishDate | 2012 |
record_format | invenio |
spelling | cern-14944882019-09-30T06:29:59Zhttp://cds.cern.ch/record/1494488CMS CollaborationUpdated 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 TeVParticle Physics - ExperimentMeasurements 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 $\rightarrow$ 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 $110 < m_H < 1000$ GeV. The analysis uses pp collision data recorded by the CMS detector at the LHC, corresponding to integrated luminosities of 5.1 ${\rm fb}^{-1}$ at $\sqrt{s} = 7$ TeV and 12.2 ${\rm fb}^{-1}$ at $\sqrt{s}= 8$ TeV. The new boson is observed with a local significance above the expected background of 4.5 standard deviations. The signal strength $\mu$, relative to the expectation for the standard model Higgs boson, is measured to be $\mu = 0.80^{+ 0.35}_{-0.28}$ at 126 GeV. A measurement of its mass gives $126.2 \pm 0.6$ (stat) $\pm 0.2$ (syst)~GeV. The hypothesis $0^+$ of the standard model for the spin $J=0$ and parity $P=+1$ 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 $0^-$ with a $\mathrm{CL_s}$ 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.CMS-PAS-HIG-12-041oai:cds.cern.ch:14944882012 |
spellingShingle | Particle Physics - Experiment CMS Collaboration 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 |
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 |
title_full | 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 |
title_fullStr | 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 |
title_full_unstemmed | 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 |
title_short | 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 |
title_sort | 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 |
topic | Particle Physics - Experiment |
url | http://cds.cern.ch/record/1494488 |
work_keys_str_mv | AT cmscollaboration updatedresultsonthenewbosondiscoveredinthesearchforthestandardmodelhiggsbosoninthezzto4leptonschannelinppcollisionsatsqrts7and8tev |