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 sin2⁡θeffℓ=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 sin2⁡θeffℓ measurement at a hadron collider, with a precision comparable to the results obtained at LEP and SLD.

Measurement of the Drell–Yan forward-backward asymmetry and of the effective leptonic weak mixing angle in proton-proton collisions at \sqrt{s}=13 TeV

Aimè, C.;Calzaferri, S.;Fiorina, D.;Montagna, P.;Riccardi, C.;Salvini, P.;Vai, I.;Vitulo, P.;Pelliccioni, M.;
2025-01-01

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 sin2⁡θeffℓ=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 sin2⁡θeffℓ measurement at a hadron collider, with a precision comparable to the results obtained at LEP and SLD.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11571/1535102
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