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

CMS Collaboration; Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Bergauer, T.; Dragicevic, M.; Erö, J.; Escalante Del Valle, A.; Flechl, M.; Frühwirth, R.; Jeitler, M.; Krammer, N.; Krätschmer, I.; Liko, D.; Madlener, T.; Mikulec, I.; Rad, N.; Schieck, J.; Schöfbeck, R.; Spanring, M.; ... mehr

The first direct, model-independent measurement is presented of the modulus of the Cabibbo–Kobayashi–Maskawa (CKM) matrix elements |V$_{tb}$|, |V$_{td}$|, and |V$_{ts}$|, 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 13TeV, corresponding to an integrated luminosity of 35.9fb$^{-1}$. 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 |V$_{tb}$| >0.970is 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 |V$_{tb}$| =0.988 ±0.024, and |V$_{td}$|2+|V$_{ts}$|2=0.06 ±0.06, where the uncertainties include both statistical and systematic components, are measured.

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Verlagsausgabe §
DOI: 10.5445/IR/1000123071
Veröffentlicht am 01.09.2020
DOI: 10.1016/j.physletb.2020.135609
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Experimentelle Teilchenphysik (ETP)
Institut für Prozessdatenverarbeitung und Elektronik (IPE)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 10.09.2020
Sprache Englisch
Identifikator ISSN: 0370-2693
KITopen-ID: 1000123071
Erschienen in Physics letters / B
Verlag North-Holland
Band 808
Seiten Art. Nr.: 135609
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Schlagwörter CMS,Physics,CKM matrix,Top quark
Nachgewiesen in Dimensions
Web of Science
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