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arXiv · 2611.01274

Measurement of the $\lvert V_\mathrm{cb}\rvert$ element of the CKM matrix using $\mathrm{t\bar{t}}$ events in pp collisions at $\sqrt{s}$ = 13 TeV

CMS Collaboration
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Abstract

A measurement of the magnitude of the Cabibbo$-$Kobayashi$-$Maskawa matrix element $V_\mathrm{cb}$ is presented using top quark pair events produced in proton-proton collisions at $\sqrt{s}$ = 13 TeV. The data correspond to an integrated luminosity of 138 fb$^{-1}$ collected by the CMS experiment at the LHC. The measurement targets the lepton+jets final state, where one W boson decays leptonically and the other hadronically. The value of $\lvert V_\mathrm{cb}\rvert$ is extracted from the branching fraction of the W $\to$ cb decay. To identify this rare signal amid the dominant W $\to$ ud and W $\to$ cs backgrounds, a multivariate discriminant based primarily on the b jet tagging information of the jets assigned to the hadronic W boson decay is used. The measured value is $\lvert V_\mathrm{cb}\rvert$ = [4.59$^{+0.44}_{-0.48}$ (stat) $^{0.64}_{-0.76}$ (syst)] $\times$ 10$^{-2}$. This measurement provides a complementary determination of $\lvert V_\mathrm{cb}\rvert$ at the electroweak scale, independent of the nonperturbative quantum chromodynamics inputs used in measurements based on semileptonic B meson decays.

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CMS Collaboration. 2026-10-31. Measurement of the $\lvert V_\mathrm{cb}\rvert$ element of the CKM matrix using $\mathrm{t\bar{t}}$ events in pp collisions at $\sqrt{s}$ = 13 TeV. https://arxiv.org/abs/2611.01274

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