A precise measurement of the Z-boson double-differential transverse momentum and rapidity distributions in the full phase space of the decay leptons with the ATLAS experiment at $\sqrt{s}$ = 8 TeV

Abstract

This paper presents for the first time a precise measurement of the production properties of the Z boson in the full phase space of the decay leptons. This is in contrast to the many previous precise unfolded measurements performed in the fiducial phase space of the decay leptons. The measurement is obtained from proton-proton collision data collected by the ATLAS experiment in 2012 at $\sqrt{s}$ = 8 TeV at the LHC and corresponding to an integrated luminosity of 20.2 fb${}^{-1}$. The results, based on a total of 15.3 million Z-boson decays to electron and muon pairs, extend and improve a previous measurement of the full set of angular coefficients describing Z-boson decay. The double-differential cross-section distributions in Z-boson transverse momentum p${}_T$ and rapidity y are measured in the pole region, defined as 80 $<$ m $<$ 100 GeV, over the range $|y|<$ 3.6. The total uncertainty of the normalised cross-section measurements in the peak region of the p${}_T$ distribution is dominated by statistical uncertainties over the full range and increases as a function of rapidity from 0.5-1.0% for $|y|<$ 2.0 to 2-7% at higher rapidities. The results for the rapidity-dependent transverse momentum distributions are compared to state-of-the-art QCD predictions, which combine in the best cases approximate N${}^4$LL resummation with N${}^3$LO fixed-order perturbative calculations. The differential rapidity distributions integrated over p${}_T$ are even more precise, with accuracies from 0.2-0.3% for $|y|<$ 2.0 to 0.4-0.9% at higher rapidities, and are compared to fixed-order QCD predictions using the most recent parton distribution functions. The agreement between data and predictions is quite good in most cases.

arXiv comment58 pages in total, author list starting page 41, 20 figures, 5 tables, published in EPJC. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2018-05

References in corpus (56)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• A Brief Introduction to PYTHIA 8.1
• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• New parton distributions for collider physics
• Event generation with SHERPA 1.1
• HERWIG 6.5: an event generator for Hadron Emission Reactions With Interfering Gluons (including supersymmetric processes)
• The ATLAS Simulation Infrastructure
• A parton shower algorithm based on Catani-Seymour dipole factorisation
• Comix, a new matrix element generator
• PHOTOS Monte Carlo: a precision tool for QED corrections in Z and W decays
• QCD matrix elements and truncated showers
• New CTEQ global analysis of quantum chromodynamics with high-precision data from the LHC
• Parton distributions from LHC, HERA, Tevatron and fixed target data: MSHT20 PDFs
• Transverse-momentum resummation and the spectrum of the Higgs boson at the LHC
• Parton Distribution Functions, ${\alpha }_s$ and Heavy-Quark Masses for LHC Run II
• The Path to Proton Structure at One-Percent Accuracy
• Combining QCD and electroweak corrections to dilepton production in FEWZ
• Parton distributions incorporating QED contributions
• Z-boson production in association with a jet at next-to-next-to-leading order in perturbative QCD
• Electron and photon energy calibration with the ATLAS detector using LHC Run 1 data
• Measurement of the muon reconstruction performance of the ATLAS detector using 2011 and 2012 LHC proton-proton collision data
• Electron reconstruction and identification efficiency measurements with the ATLAS detector using the 2011 LHC proton-proton collision data
• Electron efficiency measurements with the ATLAS detector using 2012 LHC proton-proton collision data
• Precise QCD predictions for the production of a Z boson in association with a hadronic jet
• Measurement of the transverse momentum and ${\varphi }_{\eta }^{\ast }$ distributions of Drell-Yan lepton pairs in proton-proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Analysis of vector boson production within TMD factorization
• Transverse-momentum-dependent parton distributions up to N${}^3$LL from Drell-Yan data
• Mixed QCD-electroweak O(α_sα) corrections to Drell-Yan processes in the resonance region: pole approximation and non-factorizable corrections
• Momentum-space resummation for transverse observables and the Higgs $p_{\perp }$ at N${}^3$LL+NNLO
• Measurement of the Z boson differential cross section in transverse momentum and rapidity in proton-proton collisions at 8 TeV
• Drell-Yan lepton-pair production: $q_T$ resummation at N${}^3$LL accuracy and fiducial cross sections at N${}^3$LO
• Approximate N${}^3$LO Parton Distribution Functions with Theoretical Uncertainties: MSHT20aN${}^3$LO PDFs
• A new approach to the Higgs transverse-momentum resummation at NNLL+NNLO
• Measurements of differential Z boson production cross sections in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Angular coefficients of Z bosons produced in pp collisions at sqrt(s) = 8 TeV and decaying to mu+mu- as a function of transverse momentum and rapidity
• Drell-Yan $q_T$ Resummation of Fiducial Power Corrections at N${}^3$LL
• Measurement of the differential Drell-Yan cross section in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Measurement of the angular coefficients in $Z$-boson events using electron and muon pairs from data taken at $\sqrt{s}=8$ TeV with the ATLAS detector
• W and Z Polarization Effects in Hadronic Collisions
• Higgs $p_T$ Spectrum and Total Cross Section with Fiducial Cuts at Third Resummed and Fixed Order in QCD
• Angular Distributions of Drell-Yan Lepton Pairs at the Tevatron: Order ${\alpha }_s^2$ Corrections and Monte Carlo Studies
• Fiducial Drell-Yan production at the LHC improved by transverse-momentum resummation at N${}^4$LL+N${}^3$LO
• Third order fiducial predictions for Drell-Yan at the LHC
• Measurement of the Drell--Yan triple-differential cross section in $pp$ collisions at $\sqrt{s}=8$ TeV
• DYTurbo: Fast predictions for Drell-Yan processes
• Fiducial Higgs and Drell-Yan distributions at N${}^3$LL${}^{\prime }$+NNLO with RadISH
• Update of the MCSANC Monte Carlo Integrator, v.1.20
• On the direct determination of ${\sin }^2{\theta }_{eff}^{\ell }$ at hadron colliders
• Precision studies for Drell-Yan processes at NNLO
• Systematic Studies of Exact $\mathcal{O}({\alpha }^{2}L)$ CEEX EW Corrections in a Hadronic MC for Precision $Z/{\gamma }^{\ast }$ Physics at LHC Energies
• Hadron-hadron collision mode in ReneSANCe-v1.3.0
• Initial-Final-State Interference in the Z line-shape
• Defiducialization: Providing Experimental Measurements for Accurate Fixed-Order Predictions

Cited by in corpus (6)

• Electroweak, QCD and flavour physics studies with ATLAS data from Run 2 of the LHC
• Polarized and unpolarized off-shell $H^{\ast }\to ZZ\to 4\ell$ decay above the $2m_Z$ threshold
• $H\to Z\gamma$ decay and $CP$ violation
• $CP$ violation in the $HZZ$ vertex and left-right asymmetries
• Non-diagonal contributions to $Z\gamma V^{\ast }$ vertex, polarizations and bounds on $Z\overline{t}q$ couplings
• $CP$-odd form factor in the $HWW$ vertex