Observation of Z decays to four leptons with the CMS detector at the LHC
dc.contributor.author | Chatrchyan, S. | |
dc.contributor.author | Işıldak, Bora | |
dc.date.accessioned | 2014-11-18T07:53:29Z | |
dc.date.available | 2014-11-18T07:53:29Z | |
dc.date.issued | 2012-12 | |
dc.identifier.issn | 1029-8479 | |
dc.identifier.uri | http://link.springer.com/article/10.1007/JHEP12%282012%29034 | |
dc.identifier.uri | http://hdl.handle.net/10679/607 | |
dc.description.abstract | The first observation of the Z boson decaying to four leptons in proton-proton collisions is presented. The analyzed data set corresponds to an integrated luminosity of 5.02 fb(-1) at root s = 7 TeV collected by the CMS detector at the Large Hadron Collider. A pronounced resonance peak, with a statistical significance of 9.7 sigma, is observed in the distribution of the invariant mass of four leptons (electrons and/or muons) with mass and width consistent with expectations for Z boson decays. The branching fraction and cross section reported here are defined by phase space restrictions on the leptons, namely, 80 < m(4l) < 100 GeV, where m(4l) is the invariant mass of the four leptons, and m(ll) > 4 GeV for all pairs of leptons, where m(ll) is the two-lepton invariant mass. The measured branching fraction is B(Z -> 4(l)) = 4.2(-0.8)(+0.9)(stat.) +/- 0.2(syst.)) x 10(-6) and agrees with the standard model prediction of 4.45 x 10(-6). The measured cross section times branching fraction is sigma(pp -> Z) B (Z -> 4l) = 112(-20)(+23)(stat.) +/-(+7)(-5)(syst.)(-2)(+3) (lumi.) fb, also consistent with the standard model prediction of 120 fb. The four-lepton mass peak arising from Z -> 4l decays provides a calibration channel for the Higgs boson search in the H -> ZZ -> 4l decay mode. | en_US |
dc.description.sponsorship | BMWF ; FWF ; FNRS ; FWO ; CNPq ; CAPES ; FAPERJ ; FAPESP ; MEYS ; CERN ; CAS ; MoST ; NSFC ; COLCIENCIAS ; MSES ; RPF ; MoER ; SF0690030s09 ; ERDF ; Academy of Finland ; MEC ; HIP ; CEA ; CNRS/IN2P3 ; BMBF ; DFG ; HGF ; GSRT ; OTKA ; NKTH ; DAE ; DST ; IPM ; SFI ; INFN ; NRF ; WCU ; LAS ; CINVESTAV ; CONACYT ; SEP ; UASLP-FAI ; MSI ; PAEC ; MSHE ; NSC ; FCT ; JINR ; MON ; RosAtom ; RAS ; RFBR ; MSTD ; SEIDI ; CPAN ; Swiss Funding Agencies ; NSC ; ThEPCenter ; IPST ; NSTDA ; TUBITAK ; TAEK ; NASU ; STFC ; DOE ; NSF. | |
dc.language.iso | eng | en_US |
dc.publisher | Springer Science+Business Media | en_US |
dc.relation | info:turkey/grantAgreement/TUBITAK | en_US |
dc.relation.ispartof | Journal of High Energy Physics | |
dc.rights | restrictedAccess | |
dc.title | Observation of Z decays to four leptons with the CMS detector at the LHC | en_US |
dc.type | Article | en_US |
dc.peerreviewed | yes | en_US |
dc.publicationstatus | published | en_US |
dc.contributor.department | Özyeğin University | |
dc.contributor.authorID | (ORCID 0000-0002-0283-5234 & YÖK ID 124605) Işıldak, Bora | |
dc.contributor.ozuauthor | Işıldak, Bora | |
dc.creator | The CMS Collaboration | |
dc.identifier.volume | 2012 | |
dc.identifier.issue | 34 | |
dc.identifier.wos | WOS:000313123800034 | |
dc.identifier.doi | 10.1007/JHEP12(2012)034 | |
dc.subject.keywords | Hadron-hadron scattering | en_US |
dc.identifier.scopus | SCOPUS:2-s2.0-84878561182 | |
dc.contributor.authorMale | 1 |
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