Speaker
Description
Uncertainties associated with parton distribution functions (PDFs) remain among the dominant systematic uncertainties in precision measurements of the W boson mass. A robust assessment of PDF-related uncertainties is therefore essential for future combinations of $m_W$ measurements. Drell-Yan (DY) observables, including the Z boson rapidity $y_Z$ distribution, the W boson charge asymmetry $A_W$, and the charged lepton asymmetry $A_{\ell}$, provide constraints on the parton distributions that govern the W boson rapidity $y_W$ and the lepton kinematics used in the determination of $m_W$.
In this work, the performance of several modern PDF sets for precision electroweak (EW) measurements is evaluated through a compatibility study with the aforementioned DY datasets from the ATLAS, CMS, LHCb, CDF and D0 experiments. Theory predictions are computed at NNLO in QCD with NNLL resummation using DYTurbo, and compared with the measurements through a $\chi^2$ statistic that incorporates experimental correlations and PDF uncertainties. This study will identify the PDF sets that provide the best overall description of the DY data and are therefore the most suitable candidates for future global combinations of $m_W$ measurements. In addition, PDF profiling will be performed to quantify the constraints imposed by the individual DY measurements on the parton distributions relevant for precision EW observables.
In this talk, results from the compatibility and profiling studies will be shown, demonstrating how these studies can inform the development of PDF sets tailored to high-precision EW measurements at hadron colliders.