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| CMS-PAS-SMP-24-009 | ||
| Measurement of the $ \mathrm{W}\to\mathrm{c}\mathrm{q}/\mathrm{W}\to\mathrm{q}\bar{\mathrm{q}}^{'} $ decay branching fraction ratio in proton-proton collisions at $ \sqrt{s}= $ 13 TeV | ||
| CMS Collaboration | ||
| 18 July 2024 | ||
| Abstract: The most precise measurement to date of the W boson hadronic decay branching fraction ratio $ R_\mathrm{c}^\mathrm{W} = \mathcal{B}(\mathrm{W}\to\mathrm{c}\mathrm{q})/\mathcal{B}(\mathrm{W}\to\mathrm{q}\bar{\mathrm{q}}^{'}) $ is presented. The measurement is based on a sample of proton-proton collision data from the CERN LHC collected by the CMS experiment at a center-of-mass energy of 13 TeV in 2016-2018 and corresponding to an integrated luminosity of 138 fb$ ^{-1} $. The large cross section of top quark-antiquark production at the LHC offers a sizable high-purity sample of W bosons suitable for this measurement. Events with one charged lepton (electron or muon) and at least four jets, two of them tagged as bottom quark jets, are analyzed. Charm jets are tagged using the presence of a muon inside the jet. The result, $ R_\mathrm{c}^\mathrm{W} $ = 0.489 $ \pm $ 0.020, is consistent with the standard model prediction and improves the precision of the current world average value by a factor of two. From this measurement, the sum of squared elements in the second row of the CKM matrix, 0.970 $ \pm $ 0.041, and the Cabibbo-Kobayashi-Maskawa (CKM) matrix element $ |V_{\mathrm{c}\mathrm{s}}|= $ 0.959 $ \pm $ 0.021 are derived. | ||
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These preliminary results are superseded in this paper, Submitted to PLB. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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