Publication Date:
2020-07-01
Description:
This paper describes precision measurements of the transverse momentum $$p_mathrm {T}^{ell ell }$$pTℓℓ ($$ell =e,mu $$ℓ=e,μ) and of the angular variable $$phi ^{*}_{eta }$$ϕη∗ distributions of Drell–Yan lepton pairs in a mass range of 66–116 GeV. The analysis uses data from 36.1 fb$$^{-1}$$-1 of proton–proton collisions at a centre-of-mass energy of $$sqrt{s}=13,$$s=13TeV collected by the ATLAS experiment at the LHC in 2015 and 2016. Measurements in electron-pair and muon-pair final states are performed in the same fiducial volumes, corrected for detector effects, and combined. Compared to previous measurements in proton–proton collisions at $$sqrt{s}=7$$s=7 and $$8,$$8TeV, these new measurements probe perturbative QCD at a higher centre-of-mass energy with a different composition of initial states. They reach a precision of 0.2$$\%$$% for the normalized spectra at low values of $$p_mathrm {T}^{ell ell }$$pTℓℓ. The data are compared with different QCD predictions, where it is found that predictions based on resummation approaches can describe the full spectrum within uncertainties.
Print ISSN:
1434-6044
Electronic ISSN:
1434-6052
Topics:
Physics
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