Measurement of the Drell–Yan forward-backward asymmetry and of the effective leptonic weak mixing angle in proton-proton collisions at s=13TeV
Journal
Physics Letters B
Journal Volume
866
Start Page
139526
ISSN
0370-2693
Date Issued
2025-07
Author(s)
Abstract
The forward-backward asymmetry in Drell–Yan production and the effective leptonic electroweak mixing angle are measured in proton-proton collisions at s=13 TeV, collected by the CMS experiment and corresponding to an integrated luminosity of 138fb−1. The measurement uses both dimuon and dielectron events, and is performed as a function of the dilepton mass and rapidity. The unfolded angular coefficient A4 is also extracted, as a function of the dilepton mass and rapidity. Using the CT18Z set of parton distribution functions, we obtain sin2θeffℓ=0.23152±0.00031, where the uncertainty includes the experimental and theoretical contributions. The measured value agrees with the standard model fit result to global experimental data. This is the most precise sin2θeffℓ measurement at a hadron collider, with a precision comparable to the results obtained at LEP and SLD.
Subjects
CMS
Drell-Yan
Electroweak
Mixing angle
Publisher
Elsevier BV
Type
journal article