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oai:recercat.cat:2445/562842025-12-05T16:40:13Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917

00925njm 22002777a 4500 dc Abellan Beteta, Carlos author Calvo Gómez, Míriam author Camboni, Alessandro author Comerma Montells, Albert author Domingo Bonal, Francesc author Garrido Beltrán, Lluís author Grabalosa Gándara, Marc author Graciani Díaz, Ricardo author Graugés Pous, Eugeni author López Asamar, Elias author Pérez-Calero Yzquierdo, Antonio author Picatoste Olloqui, Eduardo author Pie Valls, B. (Blai) author Potterat, Cédric author Rives Molina, Vicente José author Ruiz, Hugo (Ruiz Pérez) author Vázquez Gómez, Ricard author Vilasis-Cardona, Xavier author LHCb Collaboration author 2014-07-25T07:50:12Z 2014-07-25T07:50:12Z 2013-01 2014-07-25T07:50:12Z 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 measurements. Hadrons Teoria quàntica de camps Gravitació Teoria quàntica Relativitat (Física) Hadrons Quantum field theory Gravitation Quantum theory Relativity (Physics) A study of the Z production cross-section in pp collisions at s√=7 TeV using tau final states