Abstract
Measurements are presented of the differential cross sections for Z bosons produced in proton-proton collisions at sqrt{s} = 13 TeV and decaying to muons and electrons. The data analyzed were collected in 2016 with the CMS detector at the LHC and correspond to an integrated luminosity of 35.9 fb−1. The measured fiducial inclusive product of cross section and branching fraction agrees with next-to-next-to-leading order quantum chromodynamics calculations. Differential cross sections of the transverse momentum pT, the optimized angular variable {phi}_{eta}^{ast } , and the rapidity of lepton pairs are measured. The data are corrected for detector effects and compared to theoretical predictions using fixed order, resummed, and parton shower calculations. The uncertainties of the measured normalized cross sections are smaller than 0.5% for {phi}_{eta}^{ast } < 0.5 and for {p}_{mathrm{T}}^{mathrm{Z}} < 50 GeV.
Highlights
Background estimationThe contribution of background processes in the data sample is small relative to the signal
Measurements are presen√ted of the differential cross sections for Z bosons produced in proton-proton collisions at s = 13 TeV and decaying to muons and electrons
We present inclusive fiducial and differential production cross sections for the Z boson as a function of pT, φ∗η, and |yZ|
Summary
Background estimationThe contribution of background processes in the data sample is small relative to the signal. Resonant multiboson background processes stem from events with genuine Z bosons, e.g., WZ diboson production, and their contributions are estimated from simulation. Nonresonant background stems from processes without Z bosons, mainly from leptonic decays of W boson in tt, tW, and WW events. Events produced via s- and t-channel processes, and Z → ττ events are present The contribution of these nonresonant flavor-symmetric backgrounds is estimated from events with two oppositely charged leptons of different flavor, e. The measured cross sections are shown in table 3. The measured cross section values agree with the theoretical predictions within uncertainties. The scale uncertainties are estimated by varying μR and μF independently up and down by a factor of two from their nominal values (excluding the two extreme variations) and taking the largest cross section variations as the uncertainty
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