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We present a study of the LHC (and HL-LHC) potential towards a precisedetermination of the gluon parton distribution function of the proton atintermediate Bjorken-$x$ from measurements of Drell-Yan production. To thisextent, we exploit a clean and theoretically well predicted observable: theDrell-Yan lepton angular coefficient $A_0$, associated with the longitudinalpolarization of the Z boson. Through a detailed numerical analysis using theopen-source xFitter platform, we illustrate how this observable can providesignificant sensitivity over current determinations of the gluon PDF, and areduction in the PDF uncertainty on the Higgs boson production cross-section bya factor of over 50\%.

Longitudinal Z-boson polarization and the Higgs boson production cross-section