Measurement Of Ckm Matrix Elements İn Single Top Quark T-Channel Production İn Proton-Proton Collisions At ?S=13tev

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Küçük Resim

Tarih

2020

Dergi Başlığı

Dergi ISSN

Cilt Başlığı

Yayıncı

The CMS Collaboration

Erişim Hakkı

Özet

The first direct, model-independent measurement is presented of the modulus of the Cabibbo–Kobayashi–Maskawa (CKM) matrix elements |Vtb|, |Vtd|, and |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 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 |Vtb| >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 |Vtb| =0.988 ±0.024, and |Vtd|2+|Vts|2=0.06 ±0.06, where the uncertainties include both statistical and systematic components, are measured.

Açıklama

Anahtar Kelimeler

CMS, Physics, CKM matrix, Top quark

Kaynak

WoS Q Değeri

Q1

Scopus Q Değeri

Q3

Cilt

Sayı

Künye

Physics Letters B 808 (2020) 135609