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 - INSPIRE

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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

ATLAS

Collaboration

Nov 29, 2012

10 pages

Published in:

Phys.Lett.B 720 (2013) 32-51

Published: Mar 13, 2013

e-Print:

1211.6899 [hep-ex]

DOI:

10.1016/j.physletb.2013.01.054

Report number:

CERN-PH-EP-2012-325

Experiments:

CERN-LHC-ATLAS

View in:

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Abstract: (Elsevier)

A measurement of angular correlations in Drell-Yan lepton pairs via the @f_@h^@? observable is presented. This variable probes the same physics as the Z/@c^@? boson transverse momentum with a better experimental resolution. The Z/@c^@?->e^+e^- and Z/@c^@?->@m^+@m^- 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 @f_@h^@? 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 @f_@h^@? 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.

Note:

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

Z boson
Differential cross section
Perturbative QCD
Event generators
Monte Carlo models
vector boson: transverse momentum
quantum chromodynamics: perturbation theory
resummation
Monte Carlo
angular correlation: dilepton

References(68)

Figures(5)

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