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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.
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Vladislav Balagura, Christophe Bauer, Aurelio Bay, Marc-Olivier Bettler, Frédéric Blanc, Joël Bressieux, Peter Clarke, Victor Coco, Géraldine Conti, Greig Alan Cowan, Michel De Cian, Hans Dijkstra, Frédéric Guillaume Dupertuis, Vincent Fave, Christoph Frei, Neal Gauvin, Guido Haefeli, Plamen Hristov Hopchev, Pierre Jaton, Anne Keune, Mathias Oleg Knecht, Yiming Li, Johan Luisier, Andreas Alexander Maier, Raluca Anca Muresan, Tatsuya Nakada, Matthew Needham, Niko Neufeld, Cédric Potterat, Albert Puig Navarro, Barinjaka Rakotomiaramanana, Gerhard Raven, Julien Rouvinet, Christophe Salzmann, Olivier Schneider, Frédéric Teubert, Mark Tobin, Minh Tâm Tran, Jian Wang, Yi Zhang, Lei Zhang
Vladislav Balagura, Christophe Bauer, Aurelio Bay, Marc-Olivier Bettler, Frédéric Blanc, Joël Bressieux, Peter Clarke, Victor Coco, Géraldine Conti, Greig Alan Cowan, Michel De Cian, Hans Dijkstra, Frédéric Guillaume Dupertuis, Vincent Fave, Christoph Frei, Neal Gauvin, Luis Alberto Granado Cardoso, Guido Haefeli, Plamen Hristov Hopchev, Pierre Jaton, Anne Keune, Mathias Oleg Knecht, Johan Luisier, Raluca Anca Muresan, Tatsuya Nakada, Matthew Needham, Niko Neufeld, Cédric Potterat, Jessica Prisciandaro, Albert Puig Navarro, Barinjaka Rakotomiaramanana, Gerhard Raven, Julien Rouvinet, Christophe Salzmann, Olivier Schneider, Frédéric Teubert, Mark Tobin, Minh Tâm Tran, Jian Wang, Yi Zhang, Lei Zhang
Aurelio Bay, Marc-Olivier Bettler, Joël Bressieux, Peter Clarke, Victor Coco, Greig Alan Cowan, Michel De Cian, Hans Dijkstra, Frédéric Guillaume Dupertuis, Christoph Frei, Guido Haefeli, Plamen Hristov Hopchev, Pierre Jaton, Anne Keune, Yiming Li, Johan Luisier, Maurizio Martinelli, Raluca Anca Muresan, Bastien Luca Muster, Tatsuya Nakada, Matthew Needham, Niko Neufeld, Cédric Potterat, Jessica Prisciandaro, Barinjaka Rakotomiaramanana, Gerhard Raven, Julien Rouvinet, Christophe Salzmann, Olivier Schneider, Frédéric Teubert, Mark Tobin, Minh Tâm Tran, Jian Wang, Jean Wicht, Songmei Wu, Yi Zhang, Lei Zhang