Measurement of CKM matrix elements in single top quark t-channel production in proton-proton collisions at s=13 TeV

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dc.citation.articleNumber135609en_US
dc.citation.journalTitlePhysics Letters Ben_US
dc.citation.volumeNumber808en_US
dc.contributor.authorThe CMS Collaborationen_US
dc.date.accessioned2020-08-12T19:06:09Zen_US
dc.date.available2020-08-12T19:06:09Zen_US
dc.date.issued2020en_US
dc.description.abstractThe first direct, model-independent measurement is presented of the modulus of the Cabibbo–Kobayashi–Maskawa (CKM) matrix elements |η|Vtb, |η|Vtd, and |η|Vts, in final states enriched in single top quark t-channel events. The analysis uses proton-proton collision data from the LHC, collected during 2016 by the CMS experiment, at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1. Processes directly sensitive to these matrix elements are considered at both the production and decay vertices of the top quark. In the standard model hypothesis of CKM unitarity, a lower limit of |η|Vtb>0.970 is measured at the 95% confidence level. Several theories beyond the standard model are considered, and by releasing all constraints among the involved parameters, the values |η|Vtb=0.988±0.024, and |η|Vtd2+|η|Vts2=0.06±0.06, where the uncertainties include both statistical and systematic components, are measured.en_US
dc.identifier.citationThe CMS Collaboration. "Measurement of CKM matrix elements in single top quark t-channel production in proton-proton collisions at s=13 TeV." <i>Physics Letters B,</i> 808, (2020) Elsevier: https://doi.org/10.1016/j.physletb.2020.135609.en_US
dc.identifier.doihttps://doi.org/10.1016/j.physletb.2020.135609en_US
dc.identifier.urihttps://hdl.handle.net/1911/109190en_US
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.rightsThis is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.subject.keywordCMSen_US
dc.subject.keywordPhysicsen_US
dc.subject.keywordCKM matrixen_US
dc.subject.keywordTop quarken_US
dc.titleMeasurement of CKM matrix elements in single top quark t-channel production in proton-proton collisions at s=13 TeVen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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