Measurement of CKM matrix elements in single top quark t-channel production in proton-proton collisions at root s=13 TeV
- Title
- Measurement of CKM matrix elements in single top quark t-channel production in proton-proton collisions at root s=13 TeV
- Author
- 김태정
- Keywords
- CMS; Physics; CKM matrix; Top quark
- Issue Date
- 2020-09
- Publisher
- ELSEVIER
- Citation
- PHYSICS LETTERS B, v. 808, article no. 135609
- Abstract
- The first direct, model-independent measurement is presented of the modulus of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements vertical bar V-tb vertical bar, vertical bar V-td vertical bar, and vertical bar V-ts vertical bar, 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 vertical bar V-tb vertical bar ˃ 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 vertical bar V-tb vertical bar = 0.988 +/- 0.024, and vertical bar V-td vertical bar(2) + vertical bar V-ts vertical bar(2) = 0.06 +/- 0.06, where the uncertainties include both statistical and systematic components, are measured. (C) 2020 The Author. Published by Elsevier B.V.
- URI
- https://www.sciencedirect.com/science/article/pii/S0370269320304123?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/170716
- ISSN
- 0370-2693; 1873-2445
- DOI
- 10.1016/j.physletb.2020.135609
- Appears in Collections:
- COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
- Files in This Item:
- Measurement of CKM matrix elements in single top quark t-channel production in proton-proton collisions at root s=13 TeV.pdfDownload
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