Measurement of the cross-section for Z → e+e- production in pp collisions at √s = 7 TeV

Aaij, R; Abellan Beteta, C; Adametz, A; Adeva, B; Adinolfi, M; Adrover, C; Affolder, A; Ajaltouni, Z; Albrecht, J; Alessio, F; Alexander, M; Ali, S; Alkhazov, G; Alvarez Cartelle, P; A. 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doi:10.1007/JHEP02(2013)106

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 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. Copyright CERN.

Aaij, R., Abellan Beteta, C., Adametz, A., Adeva, B., Adinolfi, M., Adrover, C., et al. (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) [10.1007/JHEP02(2013)106].