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

Авторы: Boos E., Bunichev V., Dubinin M., Dudko L., Klyukhin V., Kodolova O., Lukina O., Obraztsov S., Perfilov M., Savrin V., Snigirev A., Vorotnikov G., CMS Collaboation
Журнал: Physics Letters B
Том: 866
Год издания: 2025
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Первая страница: 139526
DOI: 10.1016/j.physletb.2025.139526
Аннотация: 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 138 fb^−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 sin^2 𝜃^𝓁_eff = 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 sin^2 𝜃^𝓁_eff measurement at a hadron collider, with a precision comparable to the results obtained at LEP and SLD.
Добавил в систему: Клюхин Вячеслав Иванович

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