Apr 26 – 30, 2021
Europe/Zurich timezone

Electroweak corrections to the angular coefficients of Z-boson production and decay at finite-pT

Apr 28, 2021, 5:00 PM


Timea Vitos (Lund University)


The five dominant angular coefficients $A_i$ parametrizing the Drell-Yan process in the Z-boson mass range is examined, differentially in the dilepton transverse momentum $p_T$. The corresponding Lam-Tung relation $A_0-A_2$ was previously found at ATLAS and CMS to deviate from SM higher-order QCD corrections. We investigate if this discrepancy can be due to electroweak effects by calculating the fixed-order NLO electroweak corrections to these coefficients and the Lam-Tung relation. This is done by extrapolating to a full phase space coverage of calculations performed with a single lepton transverse momentum cut. The electroweak effects on the distributions are found to be small but not negligible in the low-$p_T$ range. Two of the coefficients are found to be highly sensitive to electroweak parameters. The Lam-Tung relation is found to have a significant contribution in the low-$p_T$ region from these electroweak corrections.

Primary authors

Rikkert Frederix (Lund University) Timea Vitos (Lund University)

Presentation materials