Evidence for a new state in the search for the standard model Higgs boson in the H to ZZ to 4 leptons channel in pp collisions at sqrt(s) = 7 and 8 TeV

A search for the Higgs boson in the H $\rightarrow$ ZZ four-lepton decay channel, with each Z boson decaying to an electron, a muon, or a tau pair, is reported. The search covers Higgs boson mass hypotheses in the range $110 < m_H < 600$ GeV. The analysis uses pp collision data recorded by the...

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Autor principal: CMS Collaboration
Publicado: 2012
Materias:
Acceso en línea:http://cds.cern.ch/record/1460664
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author CMS Collaboration
author_facet CMS Collaboration
author_sort CMS Collaboration
collection CERN
description A search for the Higgs boson in the H $\rightarrow$ ZZ four-lepton decay channel, with each Z boson decaying to an electron, a muon, or a tau pair, is reported. The search covers Higgs boson mass hypotheses in the range $110 < m_H < 600$ GeV. The analysis uses pp collision data recorded by the CMS detector at the LHC, corresponding to integrated luminosities of 5.05 ${\rm fb}^{-1}$ at $\sqrt{s}$ = 7 TeV and 5.26 ${\rm fb}^{-1}$ at $\sqrt{s}$ = 8\TeV. The four-lepton invariant-mass distributions for $m_{4\ell}$ and $m_{2\ell 2\tau}$ are found to be consistent with the standard model expectations for background ZZ production for invariant masses above 180 GeV. Upper limits at 95\% confidence level exclude the standard model Higgs boson in the range 131--162 and 172--525 GeV, while the expected exclusion range is 121--570 GeV. An excess of events is observed in the low $m_{4\ell}$ mass range, making the observed limits weaker than expected in the absence of a signal. These events cluster around a mass $m_{4\ell} \simeq 125.5$ GeV, giving rise to a local excess with respect to the background expectation, with a significance of $3.2\sigma$. This result constitutes evidence for a new massive state.
id cern-1460664
institution Organización Europea para la Investigación Nuclear
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spelling cern-14606642019-09-30T06:29:59Zhttp://cds.cern.ch/record/1460664CMS CollaborationEvidence for a new state in the search for the standard model Higgs boson in the H to ZZ to 4 leptons channel in pp collisions at sqrt(s) = 7 and 8 TeVParticle Physics - ExperimentA search for the Higgs boson in the H $\rightarrow$ ZZ four-lepton decay channel, with each Z boson decaying to an electron, a muon, or a tau pair, is reported. The search covers Higgs boson mass hypotheses in the range $110 < m_H < 600$ GeV. The analysis uses pp collision data recorded by the CMS detector at the LHC, corresponding to integrated luminosities of 5.05 ${\rm fb}^{-1}$ at $\sqrt{s}$ = 7 TeV and 5.26 ${\rm fb}^{-1}$ at $\sqrt{s}$ = 8\TeV. The four-lepton invariant-mass distributions for $m_{4\ell}$ and $m_{2\ell 2\tau}$ are found to be consistent with the standard model expectations for background ZZ production for invariant masses above 180 GeV. Upper limits at 95\% confidence level exclude the standard model Higgs boson in the range 131--162 and 172--525 GeV, while the expected exclusion range is 121--570 GeV. An excess of events is observed in the low $m_{4\ell}$ mass range, making the observed limits weaker than expected in the absence of a signal. These events cluster around a mass $m_{4\ell} \simeq 125.5$ GeV, giving rise to a local excess with respect to the background expectation, with a significance of $3.2\sigma$. This result constitutes evidence for a new massive state.CMS-PAS-HIG-12-016oai:cds.cern.ch:14606642012
spellingShingle Particle Physics - Experiment
CMS Collaboration
Evidence for a new state in the search for the standard model Higgs boson in the H to ZZ to 4 leptons channel in pp collisions at sqrt(s) = 7 and 8 TeV
title Evidence for a new state in the search for the standard model Higgs boson in the H to ZZ to 4 leptons channel in pp collisions at sqrt(s) = 7 and 8 TeV
title_full Evidence for a new state in the search for the standard model Higgs boson in the H to ZZ to 4 leptons channel in pp collisions at sqrt(s) = 7 and 8 TeV
title_fullStr Evidence for a new state in the search for the standard model Higgs boson in the H to ZZ to 4 leptons channel in pp collisions at sqrt(s) = 7 and 8 TeV
title_full_unstemmed Evidence for a new state in the search for the standard model Higgs boson in the H to ZZ to 4 leptons channel in pp collisions at sqrt(s) = 7 and 8 TeV
title_short Evidence for a new state in the search for the standard model Higgs boson in the H to ZZ to 4 leptons channel in pp collisions at sqrt(s) = 7 and 8 TeV
title_sort evidence for a new state in the search for the standard model higgs boson in the h to 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/1460664
work_keys_str_mv AT cmscollaboration evidenceforanewstateinthesearchforthestandardmodelhiggsbosoninthehtozzto4leptonschannelinppcollisionsatsqrts7and8tev