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A study of the Z production cross-section in pp collisions at √s=7 TeV using tau final states
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LHCb Collaboration (Including: Back, J. J., Craik, Daniel, Dossett, D., Gershon, T. J., Harrison, P. F., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Whitehead, M. (Mark) and Williams, M. P.). (2013) A study of the Z production cross-section in pp collisions at √s=7 TeV using tau final states. Journal of High Energy Physics, Volume 2013 (Number 1). Article number 111. doi:10.1007/JHEP01(2013)111 ISSN 1029-8479.
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WRAP_LCHb_10.1007-JHEP01(2013)111.pdf - Published Version Available under License Creative Commons Attribution. Download (697Kb) | Preview |
Official URL: http://dx.doi.org/10.1007/JHEP01(2013)111
Abstract
A measurement of the inclusive Z → ττ cross-section in pp collisions at √s=7TeV 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 measurement
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