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Measurement of the cross-section for Z → e+e- production in pp collisions at √s=7 TeV
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LHCb Collaboration (Including: Back, J. J., Craik, Daniel, Dossett, D., Gershon, T. J., Harrison, P. F., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Whitehead, M. (Mark) and Williams, M. P.). (2013) Measurement of the cross-section for Z → e+e- production in pp collisions at √s=7 TeV. Journal of High Energy Physics, 2013 (2). doi:10.1007/JHEP02(2013)106 ISSN 1029-8479.
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WRAP_LCHb_art%3A10.1007%2FJHEP02%282013%29106.pdf - Published Version Available under License Creative Commons Attribution. Download (817Kb) | Preview |
Official URL: http://dx.doi.org/10.1007/JHEP02(2013)106
Abstract
A measurement of the cross-section for pp → Z → e+e- is presented using
data at
p
s = 7TeV corresponding to an integrated luminosity of 0.94 fb-1. The process is
measured within the kinematic acceptance pT > 20 GeV/c and 2 < η < 4:5 for the daughter
electrons and dielectron invariant mass in the range 60-120 GeV/c2. The cross-section is
determined to be
σ (pp → Z → e+e-) = 76:0 ± 0:8 ± 2:0 ± 2:6 pb
where the first uncertainty is statistical, the second is systematic and the third is the uncertainty
in the luminosity. The measurement is performed as a function of Z rapidity and
as a function of an angular variable which is closely related to the Z transverse momentum.
The results are compared with previous LHCb measurements and with theoretical
predictions from QCD.
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