Measurement of the mass dependence of the transverse momentum of lepton pairs in Drell–Yan production in proton–proton collisions at $\sqrt{s}=13\phantom{\rule{0.166667em}{0ex}}\text{Te}\phantom{\rule{-0.80002pt}{0ex}}\text{V}$

The double differential cross sections of the Drell–Yan lepton pair ( ${\ell }^{+}{\ell }^{-}$ , dielectron or dimuon) production are measured as functions of the invariant mass ${m}_{\ell \ell }$ , transverse momentum ${p}_{\text{T}}\left(\ell \ell \right)$ , and ${\phi }_{\eta }^{\ast }$ . The ${\phi }_{\eta }^{\ast }$ observable, derived from angular measurements of the leptons and highly correlated with ${p}_{\text{T}}\left(\ell \ell \right)$ , is used to probe the low- ${p}_{\text{T}}\left(\ell \ell \right)$ region in a complementary way. Dilepton masses up to 1 $\phantom{\rule{0.166667em}{0ex}}\text{Te}\phantom{\rule{-0.80002pt}{0ex}}\text{V}$ are investigated. Additionally, a measurement is performed requiring at least one jet in the final state. To benefit from partial cancellation of the systematic uncertainty, the ratios of the differential cross sections for various ${m}_{\ell \ell }$ ranges to those in the Z mass peak interval are presented. The collected data correspond to an integrated luminosity of 36.3 $\phantom{\rule{0.166667em}{0ex}}{\text{fb}}^{-1}$ of proton–proton collisions recorded with the CMS detector at the LHC at a centre-of-mass energy of 13 $\phantom{\rule{0.166667em}{0ex}}\text{Te}\phantom{\rule{-0.80002pt}{0ex}}\text{V}$ . Measurements are compared with predictions based on perturbative quantum chromodynamics, including soft-gluon resummation.