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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
High Energy Physics - Experiment · Submitted 29 Nov 2012
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim The data are reasonably well described, in all measured Z boson rapidity regions, by resummed QCD predictions combined with fixed-order perturbative QCD calculations.
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The abstract, sentence by sentence
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.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | A measurement of angular correlations in Drell-Yan lepton pairs via the phistar observable is presented. | contribution 1.00 | 0.95 | 0.05 | asserted 1.00 |
| s1 | This variable probes the same physics as the Z/gamma* boson transverse momentum with a better experimental resolution. | background 0.53 | 0.15 | 0.06 | asserted 1.00 |
| s2 | 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. | method 0.96 | 0.73 | 0.02 | asserted 0.99 |
| s3 | The data were collected with the ATLAS detector at the LHC and correspond to an integrated luminosity of 4.6 fb-1. | method 1.00 | 0.83 | 0.02 | asserted 1.00 |
| s4 | Normalised differential cross sections as a function of phistar are measured separately for electron and muon decay channels. | contribution 0.36 | 0.97 | 0.04 | asserted 1.00 |
| s5 | These channels are then combined for improved accuracy. | method 0.97 | 0.88 | 0.03 | asserted 0.96 |
| s6 | The cross section is also measured double differentially as a function of phistar for three independent bins of the Z boson rapidity. | contribution 0.53 | 0.97 | 0.04 | asserted 1.00 |
| s7 | The results are compared to QCD calculations and to predictions from different Monte Carlo event generators. | method 0.58 | 0.73 | 0.06 | asserted 0.97 |
| s8 | The data are reasonably well described, in all measured Z boson rapidity regions, by resummed QCD predictions combined with fixed-order perturbative QCD calculations. | result 0.86 | 0.80 | 0.60 | asserted 0.72 |
| s9 | Some of the Monte Carlo event generators are also able to describe the data. | result 0.94 | 0.72 | 0.07 | hedged possibility 0.52 |
| s10 | The measurement precision is typically better by one order of magnitude than present theoretical uncertainties. | result 0.63 | 0.90 | 0.19 | asserted 0.97 |
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The paper
Original 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.
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References
How the literature uses it
36 arXiv papers cite this in 59 sentences
Papers citing it · 40 sentences without a confident label
Uses its data or values 4 papers
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At the LHC energy [ref] , the value of $χ^2$ hits the minimum at around $g_a(Q=M_Z,√(s)=7 TeV) ≃2.5$ GeV$^2$.
Exploring non-perturbative Sudakov factor via $Z^0$-boson production in $pp$ collisions · Gaussian Fit · 0.89
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Recent measurement from ATLAS collaboration [ref] of $ϕ^*_η$ observable extends to 1.3 but with large so far, statistical errors in range $ϕ^*_η>0.2$.
QED Bremsstrahlung in decays of electroweak bosons · Initial-Final state bremsstrahlung interference · 0.81
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The 7 TeV data sets consists of a $p_T$ and $ϕ^*_η$ measurement from ATLAS [ref] and a $p_T$ measurement from CMS [ref] .
Improving ResBos for the precision needs of the LHC · Z Boson Observables at the LHC · 0.99
Compares with it 7 papers
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The tendency is similar to that observed in the comparison with RESBOS in the ATLAS paper [ref] , although the deviation is slightly larger in the present result.
Precise simulation of the initial-state QCD activity associated with $Z$-boson production in hadron collisions · GR@PPA simulation · 1.00
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Figure [ref] shows angular correlations in comparison to ATLAS data from [ref] , and the transverse momentum spectrum of the Drell-Yan lepton pair in comparison to ATLAS data from [ref] .
The midpoint between dipole and parton showers · Results · 0.89
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The phenomenology reported herein makes use of a state-of-the-art resummed calculation, accurate to next-to-next-to-leading log (NNLL), which has most recently been compared with ATLAS data [ref] at $√(s)=7$ TeV, for both the $Q_T$ and $ϕ^*$ observables, as shown in Fig. [ref].
The resummation of the low-phistar domain of Z production · Introduction · 0.89
Cites it as support 1 paper
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It has been shown in Refs. [ref] the measurements on the $ϕ^*$-distribution are extremely precise, which makes it possible to explore non-perturbative physics from $Z^0$-boson production.
Exploring non-perturbative Sudakov factor via $Z^0$-boson production in $pp$ collisions · Introduction · 0.97
Cites it as background 5 papers
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The $$ was then employed by the ATLAS and LHCb experiments in recent publications [ref] .
Observable phi-eta-star at LHC and second-order QED matrix element in Z/gamma to l+ l- decays · Definition of observable $$ · 0.92
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The cross sections for the DY process as a function of $ϕ^*$ have been measured by the Collaboration at the Tevatron for $$ collisions at $√(s) = 1.96$ [ref] and at the LHC by the ATLAS Collaboration for $$ collisions at 7 and $8$ [ref] .
Measurement of differential cross sections in the kinematic angular variable $\phi^*$ for inclusive Z boson production in pp collisions at $\sqrt{s}=$ 8 TeV · Introduction · 0.84
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One of the most important observables at the LHC is the differential spectrum of the electroweak gauge bosons in their leptonic decay channels [ref] .
The $q_T$ and $\Delta\phi$ spectra in W and Z production at the LHC at N$^3$LL'+N$^2$LO · Introduction · 0.93
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