Measurement of the lvert Vcbrvert element of the CKM matrix using tt̅ events in pp collisions at √s = 13 TeV
Abstract
A measurement of the magnitude of the Cabibbo−Kobayashi−Maskawa matrix element Vcb is presented using top quark pair events produced in proton-proton collisions at √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 Vcbrvert is extracted from the branching fraction of the W → cb decay. To identify this rare signal amid the dominant W → ud and W → 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 Vcbrvert = [4.59+0.44−0.48 (stat) 0.64−0.76 (syst)] × 10−2. This measurement provides a complementary determination of lvert Vcbrvert at the electroweak scale, independent of the nonperturbative quantum chromodynamics inputs used in measurements based on semileptonic B meson decays.
Related
- Search for physics beyond the standard model in four and three top quark production events using proton-proton collisions at √s = 13 TeV
- Search for new physics using single-lepton events with high multiplicities of jets and b jets in proton-proton collisions at √s = 13 TeV
- Investigation of the difference in the angular distributions of Z→ ℓ+ℓ− events produced in quark-antiquark, quark-gluon and gluon-gluon collisions
- Measurement of the fragmentation properties of jets containing Υ(nS) mesons in proton-proton collisions at √s = 13 TeV
- Measurement of forward jet suppression in Pb+Pb collisions at √(sNN)=5.02$ TeV with the ATLAS detector
BibTeX
@misc{collaboration2026measurement,
title = {{Measurement of the $\lvert V_\mathrmcb\rvert$ element of the CKM matrix using $\mathrmt\bart$ events in pp collisions at $\sqrts$ = 13 TeV}},
author = {CMS Collaboration},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.01274},
eprint = {2611.01274},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.01274},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Measurement of the lvert V_cbrvert element of the CKM matrix using tt̅ events in pp collisions at √s = 13 TeV
AU - CMS Collaboration
PY - 2026
DA - 2026/11/01
PB - arXiv
DO - 10.48550/arxiv.2611.01274
UR - https://arxiv.org/abs/2611.01274
AB - A measurement of the magnitude of the Cabibbo−Kobayashi−Maskawa matrix element V_cb is presented using top quark pair events produced in proton-proton collisions at √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_cbrvert is extracted from the branching fraction of the W → cb decay. To identify this rare signal amid the dominant W → ud and W → 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_cbrvert = [4.59^+0.44_−0.48 (stat) ^0.64_−0.76 (syst)] × 10^−2. This measurement provides a complementary determination of lvert V_cbrvert at the electroweak scale, independent of the nonperturbative quantum chromodynamics inputs used in measurements based on semileptonic B meson decays.
ER -