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Journal of High Energy Physics 1 (2013) 111
A study of the $Z$ production cross-section in $pp$ collisions at $\sqrt{s} = 7$ TeV using tau final states
R. Aaij, S. Barsuk1, O. Callot1, J. He1, B. Jean-Marie1, J. Lefrançois1, F. Machefert1, A. Martin Sanchez1, M. Nicol1, P. Robbe1, M.-H. Schune1, B. Viaud1, I. Videau1, E. Ben-Haim2, M. Benayoun2, P. David2, L. Del Buono2, A. Martens2, Z J Ajaltouni3, O. Deschamps3, E. Cogneras3, I. El Rifai3, P. Henrard3, M. Hoballah3, M. Jahjah Hussein3, R. Lefèvre3, L. Li Gioi3, S. Monteil3, V. Niess3, P. Perret3, D.A. Roa Romero3, K. Sobczak3, I. De Bonis4, D. Decamp4, Ph. Ghez4, P. Hopchev4, J.-P. Lees4, I.V. Machikhiliyan4, M.-N. Minard4, B. Pietrzyk4, W. Qian4, S. T'Jampens4, V. Tisserand4, E. Tournefier4, C. Adrover5, E. Aslanides5, J. Cogan5, R. Legac5, O. Leroy5, G. Mancinelli5, E. Maurice5, M. Perrin-Terrin5, M. Sapunov5, J. Serrano5, A. Tsaregorodtsev5
For the LHCb collaboration(s)

A measurement of the inclusive $Z \to \tau\tau$ cross-section in $pp$ collisions at $\sqrt{s} = 7$ TeV is presented based on a dataset of 1.0 fb$^{-1}$ collected by the LHCb detector. Candidates for $Z \to \tau\tau$ 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 $\sigma_{pp \to Z \to \tau\tau} = 71.4 \pm 3.5 \pm 2.8 \pm 2.5$ pb; the first uncertainty is statistical, the second uncertainty is systematic, and the third is due to the uncertainty on the integrated luminosity. The ratio of the cross-sections for $Z \to \tau\tau$ to $Z \to \mu\mu$ is determined to be $0.93 \pm 0.09$, where the uncertainty is the combination of statistical, systematic, and luminosity uncertainties of the two measurements.
1:  LAL - Laboratoire de l'Accélérateur Linéaire
2:  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
3:  LPC - Laboratoire de Physique Corpusculaire [Clermont-Ferrand]
4:  LAPP - Laboratoire d'Annecy le Vieux de Physique des Particules
5:  CPPM - Centre de Physique des Particules de Marseille
Physics/High Energy Physics - Experiment
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