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

The LHCb Collaboration

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Abstract: A measurement of the inclusive Z → ττ cross-section in pp collisions at s=7, TeV is presented based on a dataset of 1.0 fb -1 collected by the LHCb detector. Candidates for Z → τ τ 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 τ leptons with transverse momenta greater than 20 GeV/c and pseudorapidities between 2.0 and 4.5, is measured to be σ pp→Z→ττ = 71.4 ± 3.5 ± 2.8 ± 2.5 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 → τ τ to Z → μμ is determined to be 0.93 ± 0.09, where the uncertainty is the combination of statistical, systematic, and luminosity uncertainties of the two measurements.[Figure not available: see fulltext.]

Original languageEnglish
Article number111
Number of pages20
JournalJournal of High Energy Physics
Issue number1
Publication statusPublished - 16 Jan 2013
Externally publishedYes


  • Keywords: Hadron-Hadron Scattering

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