Measurement of Z → τ[superscript +]τ[superscript −] Production in Proton-Proton Collisions at √s = 8 TeV
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Aidala, C. A
Ajaltouni, Z.
Akar, S.
Albicocco, P.
Albrecht, J.
Alessio, F.
Alexander, M.
Date Issued
September 2018
Journal
Journal of High Energy Physics
Publisher
Springer Berlin Heidelberg
Citation
The LHCb collaboration, et al. “Measurement of Z → τ[superscript +]τ[superscript −] Production in Proton-Proton Collisions at √s = 8 TeV.” Journal of High Energy Physics, vol. 2018, no. 9, Sept. 2018. © 2018 The Authors
Version
Final published version
Abstract
A measurement of Z → τ[superscript +]τ[superscript −] production cross-section is presented using data, corresponding to an integrated luminosity of 2 fb[superscript −1], from pp collisions at √s=8 TeV collected by the LHCb experiment. The τ[superscript +]τ[superscript −] 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/c[superscript 2], 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 σ[subscript pp]→Z→τ[superscript +]τ[superscript −] = 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[superscript +]τ[superscript −] to Z → μ[superscript +]μ[superscript −] (Z → e[superscript +]e[superscript −]), determined to be 1.01 ± 0.05 (1.02 ± 0.06), is consistent with the lepton-universality hypothesis in Z decays. Keywords: Electroweak interaction, Forward physics, Hadron-Hadron scattering (experiments), Lepton production, Tau Physics
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1007/JHEP09(2018)159
