Measurement of W±-boson differential cross-sections in proton–proton collisions with low pile-up data at √s = 5.02TeV and 13TeV with the ATLAS detector

Abstract

High precision single-differentialW±-boson production cross-sections as a function of electron or muontransverse momentum pT or their pseudorapity η, as well asdouble-differential cross-sections as functions of these variables,are measured in proton–proton collisions at centre-ofmassenergies√s = 5.02TeV and 13TeV. The W-bosoncharge asymmetry as a function of lepton η is also measured.The data, collected in dedicated runs at reduced instantaneousluminosity with the ATLAS detector at the Large HadronCollider, correspond to integrated luminosities of 255 pb−1at 5.02TeV and 338 pb−1 at 13TeV. The measurements arein agreement with Standard-Model predictions calculated atnext-to-next-to-leading-order in the strong coupling constantαs including transverse-momentum resummation at next-tonext-to-leading logarithmic accuracy using several partondistribution functions. The impact of the measured differentialcross-sections as a function of lepton η on the determination of these functions is studied using a profiling technique.