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

A measurement of the cross-section for pp → Z → e[superscript +]e[superscript −] is presented using data at √s = 7 TeV corresponding to an integrated luminosity of 0.94 fb[superscript −1]. The process is measured within the kinematic acceptance pT > 20 GeV/c and 2 < η < 4.5 for the daught...

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Bibliographic Details
Main Author: Williams, Michael
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:en_US
Published: Springer-Verlag/SISSA 2017
Online Access:http://hdl.handle.net/1721.1/108576
https://orcid.org/0000-0001-8285-3346
Description
Summary:A measurement of the cross-section for pp → Z → e[superscript +]e[superscript −] is presented using data at √s = 7 TeV corresponding to an integrated luminosity of 0.94 fb[superscript −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/c[superscript 2]. The cross-section is determined to be σ(pp→Z→e[superscript +]e[superscript −]) = 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.