Measurement of angular correlations in Drell–Yan lepton pairs to probe Z/γ ∗ boson transverse momentum at √s = 7 TeV with the ATLAS detector
A measurement of angular correlations in Drell–Yan lepton pairs via the φ∗ η observable is presented. This variable probes the same physics as the Z/γ ∗ boson transverse momentum with a better experimental resolution. The Z/γ ∗ → e+e− and Z/γ ∗ → μ+μ− decays produced in proton–proton collisions at a...
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2013
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Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/77566 |
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I19-R120-10915-77566 |
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Universidad Nacional de La Plata |
institution_str |
I-19 |
repository_str |
R-120 |
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SEDICI (UNLP) |
language |
Inglés |
topic |
Ciencias Exactas Z boson Differential cross section Perturbative QCD Event generators Monte Carlo models Física |
spellingShingle |
Ciencias Exactas Z boson Differential cross section Perturbative QCD Event generators Monte Carlo models Física Anduaga, Xabier Sebastián Dova, María Teresa Monticelli, Fernando Gabriel Tripiana, Martín F. The ATLAS Collaboration Measurement of angular correlations in Drell–Yan lepton pairs to probe Z/γ ∗ boson transverse momentum at √s = 7 TeV with the ATLAS detector |
topic_facet |
Ciencias Exactas Z boson Differential cross section Perturbative QCD Event generators Monte Carlo models Física |
description |
A measurement of angular correlations in Drell–Yan lepton pairs via the φ∗ η observable is presented. This variable probes the same physics as the Z/γ ∗ boson transverse momentum with a better experimental resolution. The Z/γ ∗ → e+e− and Z/γ ∗ → μ+μ− decays produced in proton–proton collisions at a centre-of-mass energy of √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 <math xmlns="http://www.w3.org/1998/Math/MathML"><msubsup is="true"><mrow is="true"><mi is="true">ϕ</mi></mrow><mrow is="true"><mi is="true">η</mi></mrow> <mrow is="true"><mo is="true">⁎</mo></mrow></msubsup></math> 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 <math xmlns="http://www.w3.org/1998/Math/MathML"><msubsup is="true"><mrow is="true"> <mi is="true">ϕ</mi></mrow><mrow is="true"><mi is="true">η</mi></mrow> <mrow is="true"><mo is="true">⁎</mo></mrow></msubsup></math> 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 or by some Monte Carlo event generators. The measurement precision is typically better by one order of magnitude than present theoretical uncertainties. |
format |
Articulo Articulo |
author |
Anduaga, Xabier Sebastián Dova, María Teresa Monticelli, Fernando Gabriel Tripiana, Martín F. The ATLAS Collaboration |
author_facet |
Anduaga, Xabier Sebastián Dova, María Teresa Monticelli, Fernando Gabriel Tripiana, Martín F. The ATLAS Collaboration |
author_sort |
Anduaga, Xabier Sebastián |
title |
Measurement of angular correlations in Drell–Yan lepton pairs to probe Z/γ ∗ boson transverse momentum at √s = 7 TeV with the ATLAS detector |
title_short |
Measurement of angular correlations in Drell–Yan lepton pairs to probe Z/γ ∗ boson transverse momentum at √s = 7 TeV with the ATLAS detector |
title_full |
Measurement of angular correlations in Drell–Yan lepton pairs to probe Z/γ ∗ boson transverse momentum at √s = 7 TeV with the ATLAS detector |
title_fullStr |
Measurement of angular correlations in Drell–Yan lepton pairs to probe Z/γ ∗ boson transverse momentum at √s = 7 TeV with the ATLAS detector |
title_full_unstemmed |
Measurement of angular correlations in Drell–Yan lepton pairs to probe Z/γ ∗ boson transverse momentum at √s = 7 TeV with the ATLAS detector |
title_sort |
measurement of angular correlations in drell–yan lepton pairs to probe z/γ ∗ boson transverse momentum at √s = 7 tev with the atlas detector |
publishDate |
2013 |
url |
http://sedici.unlp.edu.ar/handle/10915/77566 |
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