Measurement of the mass dependence of the transverse momentum of lepton pairs in Drell–Yan production in proton–proton collisions at $$\sqrt{s} = 13\,\text {Te\hspace{-.08em}V} $$ s = 13 Te V

Abstract

Abstract The double differential cross sections of the Drell–Yan lepton pair (

$$\ell ^+\ell ^-$$

ℓ +

ℓ -

, dielectron or dimuon) production are measured as functions of the invariant mass

$$m_{\ell \ell }$$

m

ℓ ℓ

, transverse momentum

$$p_{\textrm{T}} (\ell \ell )$$

p T

( ℓ ℓ )

, and

$$\varphi ^{*}_{\eta }$$

φ η

∗

. The

$$\varphi ^{*}_{\eta }$$

φ η

∗

observable, derived from angular measurements of the leptons and highly correlated with

$$p_{\textrm{T}} (\ell \ell )$$

p T

( ℓ ℓ )

, is used to probe the low-

$$p_{\textrm{T}} (\ell \ell )$$

p T

( ℓ ℓ )

region in a complementary way. Dilepton masses up to 1

$$\,\text {Te\hspace{-.08em}V}$$

Te

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

$$m_{\ell \ell }$$

m

ℓ ℓ

ranges to those in the Z mass peak interval are presented. The collected data correspond to an integrated luminosity of 36.3

$$\,\text {fb}^{-1}$$

fb

- 1

of proton–proton collisions recorded with the CMS detector at the LHC at a centre-of-mass energy of 13

$$\,\text {Te\hspace{-.08em}V}$$

Te

V

. Measurements are compared with predictions based on perturbative quantum chromodynamics, including soft-gluon resummation.