Measurement of angular correlations in Drell-Yan lepton pairs to probe Z/gamma* boson transverse momentum at sqrt(s)=7 TeV with the ATLAS detector

Abstract

A measurement of angular correlations in Drell-Yan lepton pairs via the phistar observable is presented. This variable probes the same physics as the Z/gamma* boson transverse momentum with a better experimental resolution. The Z/gamma*->e+e- and Z/gamma*->mu+mu- decays produced in proton--proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV are used. The data were collected with the ATLAS detector at the LHC and correspond to an integrated luminosity of 4.6 fb-1. Normalised differential cross sections as a function of phistar are measured separately for electron and muon decay channels. These channels are then combined for improved accuracy. The cross section is also measured double differentially as a function of phistar for three independent bins of the Z boson rapidity. The results are compared to QCD calculations and to predictions from different Monte Carlo event generators. The data are reasonably well described, in all measured Z boson rapidity regions, by resummed QCD predictions combined with fixed-order perturbative QCD calculations. Some of the Monte Carlo event generators are also able to describe the data. The measurement precision is typically better by one order of magnitude than present theoretical uncertainties.

10 pages plus author list (22 pages total), 3 figures, 3 tables, submitted to Physics Letters B. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2012-06/ Revision corresponds to published version

References in corpus (23)

• PYTHIA 6.4 Physics and Manual
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• New parton distributions for collider physics
• Event generation with SHERPA 1.1
• An NNLO subtraction formalism in hadron collisions and its application to Higgs boson production at the LHC
• Vector boson pair production at the LHC
• Vector boson production at hadron colliders: a fully exclusive QCD calculation at NNLO
• Electroweak gauge boson production at hadron colliders through O(alpha_s^2)
• FEWZ 2.0: A code for hadronic Z production at next-to-next-to-leading order
• Drell-Yan production at small q_T, transverse parton distributions and the collinear anomaly
• NLO vector-boson production matched with shower in POWHEG
• Combining QCD and electroweak corrections to dilepton production in FEWZ
• Production of Drell--Yan lepton pairs in hadron collisions: transverse-momentum resummation at next-to-next-to-leading logarithmic accuracy
• Soft Photon Radiation in Particle Decays in SHERPA
• Measurement of the W Boson Mass with the D0 Detector
• Measurement of the shape of the boson transverse momentum distribution in ppbar -> Z/gamma* -> ee+X events produced at sqrt{s}=1.96 TeV
• Optimisation of variables for studying dilepton transverse momentum distributions at hadron colliders
• A Novel Technique for Studying the Z Boson Transverse Momentum Distribution at Hadron Colliders
• Transverse momentum cross section of $e^{+}{e}^{-}$ pairs in the $Z$-boson region from $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV
• Predictions for Drell-Yan ϕ* and Q_T observables at the LHC
• QCD predictions for new variables to study dilepton transverse momenta at hadron colliders
• Transverse Momentum Distributions in the Non-Perturbative Region
• Z boson transverse momentum spectrum from the lepton angular distributions

Cited by in corpus (44)

• Measurement of the $Z/{\gamma }^{\ast }$ boson transverse momentum distribution in $pp$ collisions at $\sqrt{s}$ = 7 TeV with the ATLAS detector
• Measurement of the $W$-boson mass in pp collisions at $\sqrt{s}=7$ TeV with the ATLAS detector
• Electron reconstruction and identification efficiency measurements with the ATLAS detector using the 2011 LHC proton-proton collision data
• 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
• The midpoint between dipole and parton showers
• Drell-Yan Production at NNLL'+NNLO Matched to Parton Showers
• NNLOPS accurate Drell-Yan production
• Measurement of the Z boson differential cross section in transverse momentum and rapidity in proton-proton collisions at 8 TeV
• Measurement of the cross-section for Z->e+e- production in pp collisions at sqrt{s}=7TeV
• Vector boson production at hadron colliders: transverse-momentum resummation and leptonic decay
• The transverse momentum spectrum of weak gauge bosons at N${}^3$LL+NNLO
• QCD resummation for hadronic final states
• Measurement of the Drell--Yan triple-differential cross section in $pp$ collisions at $\sqrt{s}=8$ TeV
• Combining $Q_T$ and small-$x$ resummations
• Measurement of the low-mass Drell-Yan differential cross section at $\sqrt{s}$ = 7 TeV using the ATLAS detector
• Measurement of exclusive $\gamma \gamma \to {\ell }^{+}{\ell }^{-}$ production in proton-proton collisions at $\sqrt{s}=7$ TeV with the ATLAS detector
• Nonperturbative contributions to a resummed leptonic angular distribution in inclusive neutral vector boson production
• Matching NNLO to parton shower using N${}^3$LL colour-singlet transverse momentum resummation in GENEVA
• QED Bremsstrahlung in decays of electroweak bosons
• Initial State Radiation in the Herwig 7 Angular-Ordered Parton Shower
• Implications of an axino LSP for naturalness
• Drell-Yan lepton pair production at LHC and TMD quark densities of the proton
• Probing parton saturation with forward $Z^0$-boson production at small transverse momentum in p+p and p+A collisions
• A study of multi-jet production in association with an electroweak vector boson
• Nuclear parton density modifications from low-mass lepton pair production at the LHC
• MCNNTUNES: tuning Shower Monte Carlo generators with machine learning
• Measurement of the ${\varphi }_{\eta }^{\ast }$ distribution of muon pairs with masses between 30 and 500 GeV in 10.4 fb${}^{-1}$ of $p\bar{p}$ collisions
• Measurement of differential cross sections in the kinematic angular variable ${\varphi }^{\ast }$ for inclusive Z boson production in pp collisions at $\sqrt{s}=$ 8 TeV
• Phenomenological Study of the Interplay between IR-Improved DGLAP-CS Theory and the Precision of an NLO ME Matched Parton Shower MC
• Exploring neutrino physics at LHC via R-parity violating SUSY
• Supersymmetric Higgs-portal and X-ray lines
• The analysis of Drell-Yan lepton pair production in the P-P(P) colliders using different angular ordering constraints and $k_t$-factorization approach
• Exploring non-perturbative Sudakov factor via $Z^0$-boson production in $pp$ collisions
• Probing neutrino physics at LHC through R-parity breaking supersymmetry
• New Approach to Hard Corrections in Precision QCD for LHC and FCC Physics
• Precise simulation of the initial-state QCD activity associated with $Z$-boson production in hadron collisions
• At the Frontier of Precision QCD in the LHC Era
• Accurate prediction of the ${\varphi }_{\eta }^{\ast }$ distribution for the forward Z boson production in pp collisions through NNLO+N${}^3$LL
• Electroweak measurements from $W$, $Z$ and photon final states
• Comparisons of Predictions from Exact Amplitude-Based Resummation Methods with LHC and Cosmological Data
• Hard Corrections in Precision QCD for LHC and FCC Physics: A New Approach
• New developments in exact amplitude-based resummation in precision theory vs experiment
• Comparisons of Exact Amplitude--Based Resummation Predictions and LHC Data
• Exact Amplitude--Based Resummation QCD Predictions and LHC Data