Precision electroweak measurements with ATLAS

Proceedings for EPS conference: The electroweak sector of the Standard Model can be tested via precision measurements of fun- damental observables. The ATLAS collaboration has recently measured the effective leptonic weak mixing angle using data collected during the Run-1 of the LHC at a centre-of-mass energy of 8 TeV. The result is sin2thetaW = 0.23140 ± 0.00036, yielding a precision similar to that of the eff recently published Tevatron legacy result and to the most precise individual observable measure- ments from lepton colliders. The W-boson mass was firstly measured at the LHC in the ATLAS Collaboration using LHC Run-1 data at a centre-of-mass energy of 7 TeV. The obtained result is the most precise individual measurement of the W-boson mass mW = 80370 ± 19 MeV. Prospects of these electroweak measurements at the HL-LHC are also discussed.