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.articleNumber135609
dc.citation.journalTitlePhysics Letters B
dc.citation.volumeNumber808
dc.contributor.authorThe CMS Collaboration
dc.date.accessioned2020-08-12T19:06:09Z
dc.date.available2020-08-12T19:06:09Z
dc.date.issued2020
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.
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.
dc.identifier.doihttps://doi.org/10.1016/j.physletb.2020.135609
dc.identifier.urihttps://hdl.handle.net/1911/109190
dc.language.isoeng
dc.publisherElsevier
dc.rightsThis is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subject.keywordCMS
dc.subject.keywordPhysics
dc.subject.keywordCKM matrix
dc.subject.keywordTop quark
dc.titleMeasurement of CKM matrix elements in single top quark t-channel production in proton-proton collisions at s=13 TeV
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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