Measurement of Z → τ +τ − production in proton-proton collisions at √s=8 TeV
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Title: | Measurement of Z → τ +τ − production in proton-proton collisions at √s=8 TeV |
Author: | LHCb Collaboration Adeva Andany, Bernardo Boente García, Óscar Borsato, Martino Chobanova, Veronika Cid Vidal, Xabier Dosil Suárez, Álvaro Fernández Prieto, Antonio Gallas Torreira, Abraham Antonio García Plana, Beatriz Lucio Martínez, Miriam Martínez Santos, Diego Plo Casasus, Máximo Prisciandaro, James J. Ramos Pernas, Miguel Romero Vidal, Antonio Saborido Silva, Juan José Sanmartín Sedes, Brais Santamarina Ríos, Cibrán Vázquez Regueiro, Pablo Vieites Díaz, María |
Affiliation: | Universidade de Santiago de Compostela. Departamento de Física de Partículas Universidade de Santiago de Compostela. Instituto Galego de Física de Altas Enerxías (IGFAE) |
Subject: | Electroweak interaction | Forward physics | Hadron-Hadron scattering (experiments) | Lepton production | Tau Physics | |
Date of Issue: | 2018 |
Publisher: | Springer |
Citation: | Aaij, R., Adeva, B., Adinolfi, M. et al. Measurement of Z → τ +τ − production in proton-proton collisions at √s=8 TeV. J. High Energ. Phys. 2018, 159 (2018). https://doi.org/10.1007/JHEP09(2018)159 |
Abstract: | A measurement of Z → τ +τ − production cross-section is presented using data, corresponding to an integrated luminosity of 2 fb−1, from pp collisions at √s=8 TeV collected by the LHCb experiment. The τ +τ − candidates are reconstructed in final states with the first tau lepton decaying leptonically, and the second decaying either leptonically or to one or three charged hadrons. The production cross-section is measured for Z bosons with invariant mass between 60 and 120 GeV/c2, which decay to tau leptons with transverse momenta greater than 20 GeV/c and pseudorapidities between 2.0 and 4.5. The cross-section is determined to be σpp→Z→τ+τ−=95.8±2.1±4.6±0.2±1.1 pb, where the first uncertainty is statistical, the second is systematic, the third is due to the LHC beam energy uncertainty, and the fourth to the integrated luminosity uncertainty. This result is compatible with NNLO Standard model predictions. The ratio of the cross-sections for Z → τ+τ− to Z → μ+μ− (Z → e+e−), determined to be 1.01 ± 0.05 (1.02 ± 0.06), is consistent with the lepton-universality hypothesis in Z decays. |
Publisher version: | https://doi.org/10.1007/JHEP09(2018)159 |
URI: | http://hdl.handle.net/10347/22304 |
DOI: | 10.1007/JHEP09(2018)159 |
ISSN: | 1029-8479 |
Rights: | © CERN, for the bene t of the LHCb Collaboration. Article funded by SCOAP3. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. |
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Except where otherwise noted, this item's license is described as © CERN, for the bene t of the LHCb Collaboration. Article funded by SCOAP3. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.