Measurement of the mass dependence of the transverse momentum of lepton pairs in Drell-Yan production in proton-proton collisions at s=13TeV

Abstract

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$\text{Te}\text{V}$ 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${\text{fb}}^{-1}$ of proton-proton collisions recorded with the CMS detector at the LHC at a centre-of-mass energy of 13$\text{Te}\text{V}$. Measurements are compared with predictions based on perturbative quantum chromodynamics, including soft-gluon resummation.