Compact Muon Solenoid
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| CMS-PAS-SMP-22-010 | ||
| Measurement of the Drell-Yan forward-backward asymmetry and of the effective leptonic weak mixing angle using proton-proton collisions at $ \sqrt{s}= $ 13 TeV | ||
| CMS Collaboration | ||
| 27 March 2024 | ||
| Abstract: The forward-backward asymmetry in Drell-Yan production and the effective leptonic electroweak mixing angle are measured using a sample of proton-proton collisions at $ \sqrt{s}= $ 13 TeV collected by the CMS experiment and corresponding to an integrated luminosity of 137 fb$ ^{-1} $. The measurement uses both dimuon and dielectron events, and is performed as a function of the dilepton's mass and rapidity. Using the CT18Z set of parton distribution functions (PDF), we obtain $ \sin^2\theta^\ell_{\mathrm{eff}} = $ 0.23157 $\pm$ 0.00010 (stat) $\pm$ 0.00015 (syst) $\pm$ 0.00009 (theo) $\pm$ 0.00027(PDF), the total uncertainty being 0.00031. The measured value agrees with the standard model prediction. The total uncertainty varies between 0.00024 and 0.00035, depending on the PDF set. This is the most precise $ \sin^2\theta^\ell_{\mathrm{eff}} $ measurement at a hadron collider, with a precision comparable to the results obtained at LEP and SLD. | ||
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Links:
CDS record (PDF) ;
Physics Briefing ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Submitted to PLB. The superseded preliminary plots can be found here.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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