A measurement of the cross-section for pp → Z → e +e - is presented using data at √s = 7 TeV corresponding to an integrated luminosity of 0.94 fb -1. The process is measured within the kinematic acceptance p T > 20 GeV=c and 2 < η < 4:5 for the daughter electrons and dielectron invariant mass in the range 60-120 GeV=c 2. 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. Copyright CERN.
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All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics