A study of the Z production cross-section in pp collisions at root s=7 TeV using tau final states

LHCb collaboration

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A measurement of the inclusive Z -> tau tau cross-section in p p collisions at root s = 7 TeV is presented based on a dataset of 1.0 fb(-1) collected by the LHCb detector. Candidates for Z -> tau tau decays are identified through reconstructed final states with two muons, a muon and an electron, a muon and a hadron, or an electron and a hadron. The production cross-section for Z bosons, with invariant mass between 60 and 120 GeV/c(2), which decay to tau leptons with transverse momenta greater than 20 GeV/c and pseudorapidities between 2.0 and 4.5, is measured to be sigma(pp)-> Z ->(tau tau) = 71.4 +/- 3.5 +/- 28 +/- 25 pb; the first uncertainty is statistical, the second is systematic, and the third is due to the uncertainty on the integrated luminosity. The ratio of the cross-sections for Z -> tau tau to Z -> mu mu is determined to be 0.93 +/- 0.09, where the uncertainty is the combination of statistical, systematic, and luminosity uncertainties of the two measurements.
Original languageEnglish
Article number111
Number of pages20
JournalJournal of High Energy Physics
Issue number1
Publication statusPublished - 1 Jan 2013
Externally publishedYes


  • Hadron-Hadron Scattering

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