Measurement of the Drell-Yan forward-backward asymmetry and of the effective leptonic weak mixing angle using proton-proton collisions at 13 TeV

CMS Physics Analysis Summaries
Report number	CMS-PAS-SMP-22-010
Title	Measurement of the Drell-Yan forward-backward asymmetry and of the effective leptonic weak mixing angle using proton-proton collisions at 13 TeV
Corporate author(s)	CMS Collaboration
Collaboration	CMS Collaboration
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; CMS
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 $\sqrt{s}=13~\mathrm{TeV}$ collected by the CMS experiment and corresponding to an integrated luminosity of $137~\mathrm{fb}^{-1}$. 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 $$\sin^2\theta^\ell_\mathrm{eff} = 0.23157 \pm 0.00010\mathrm{(stat)} \pm 0.00015\mathrm{(syst)} \pm 0.00009\mathrm{(theo)} \pm 0.00027(\mathrm{PDF}),$$ 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.
Email contact: cms-pag-conveners-smp@cern.ch Fulltext in PDF Figure_009-b Figure_009-a Figure_010 Figure_011 Figure_003-a Figure_003-b Figure_004-f Figure_004-d Figure_004-e Figure_004-b Figure_004-c Figure_004-a Figure_005-b Figure_005-a Figure_007-a Figure_007-b Figure_006-a Figure_006-b Figure_006-c Figure_006-d Figure_002-a Figure_002-b Figure_008 Figure_001 Additional information for the analysis (restricted access)