Observation of Single Top Quark Production in Association with a Z Boson in Proton-Proton Collisions at root s=13 TeV

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dc.contributor.author The CMS collaboration
dc.contributor.author Sirunyan, A. M.
dc.contributor.author Eerola, P.
dc.contributor.author Kirschenmann, H.
dc.contributor.author Pekkanen, J.
dc.contributor.author Voutilainen, M.
dc.contributor.author Havukainen, J.
dc.contributor.author Heikkilä, J. K.
dc.contributor.author Järvinen, T.
dc.contributor.author Karimäki, V.
dc.contributor.author Kinnunen, R.
dc.contributor.author Lampén, T.
dc.contributor.author Lassila-Perini, K.
dc.contributor.author Laurila, S.
dc.contributor.author Lehti, S.
dc.contributor.author Lindén, T.
dc.contributor.author Luukka, P.
dc.contributor.author Mäenpää, T.
dc.contributor.author Siikonen, H.
dc.contributor.author Tuominen, E.
dc.contributor.author Tuominiemi, J.
dc.contributor.author Tuuva, T.
dc.date.accessioned 2019-05-03T14:50:01Z
dc.date.available 2019-05-03T14:50:01Z
dc.date.issued 2019-04-05
dc.identifier.citation The CMS Collaboration , Sirunyan , A M , Eerola , P , Kirschenmann , H , Pekkanen , J , Voutilainen , M , Havukainen , J , Heikkilä , J K , Järvinen , T , Karimäki , V , Kinnunen , R , Lampén , T , Lassila-Perini , K , Laurila , S , Lehti , S , Lindén , T , Luukka , P , Mäenpää , T , Siikonen , H , Tuominen , E , Tuominiemi , J & Tuuva , T 2019 , ' Observation of Single Top Quark Production in Association with a Z Boson in Proton-Proton Collisions at root s=13 TeV ' , Physical Review Letters , vol. 122 , no. 13 , 132003 . https://doi.org/10.1103/PhysRevLett.122.132003
dc.identifier.other PURE: 124384956
dc.identifier.other PURE UUID: 62e33496-ab9d-460c-84ee-6974d9849f1d
dc.identifier.other WOS: 000463901800006
dc.identifier.other ORCID: /0000-0001-7507-8636/work/57046191
dc.identifier.other ORCID: /0000-0003-2039-5874/work/57046359
dc.identifier.other ORCID: /0000-0003-2898-6900/work/57046803
dc.identifier.other ORCID: /0000-0002-5200-6477/work/61593104
dc.identifier.other ORCID: /0000-0001-7369-2536/work/61901550
dc.identifier.other ORCID: /0000-0002-7073-7767/work/61592216
dc.identifier.other ORCID: /0000-0002-0538-1469/work/68618114
dc.identifier.uri http://hdl.handle.net/10138/301436
dc.description.abstract The observation of single top quark production in association with a Z boson and a quark (tZq) is reported. Events from proton-proton collisions at a center-of-mass energy of 13 TeV containing three charged leptons (either electrons or muons) and at least two jets are analyzed. The data were collected with the CMS detector in 2016 and 2017 and correspond to an integrated luminosity of 77.4fb(-1). The increased integrated luminosity, a multivariate lepton identification, and a redesigned analysis strategy improve significantly the sensitivity of the analysis compared to previous searches for tZq production. The tZq signal is observed with a significance well over 5 standard deviations. The measured tZq production cross section is sigma(pp -> tZq -> tl(+) l(-) q) = 111 +/- 13 (stat)(-9)(+11) (syst) fb, for dilepton invariant masses above 30 GeV, in agreement with the standard model expectation. en
dc.format.extent 19
dc.language.iso eng
dc.relation.ispartof Physical Review Letters
dc.rights cc_by
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject 114 Physical sciences
dc.title Observation of Single Top Quark Production in Association with a Z Boson in Proton-Proton Collisions at root s=13 TeV en
dc.type Article
dc.contributor.organization Department of Physics
dc.contributor.organization Helsinki Institute of Physics
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.1103/PhysRevLett.122.132003
dc.relation.issn 0031-9007
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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