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Measurement of Z → τ <sup>+</sup> τ <sup>−</sup> production in proton-proton collisions at √s=8 TeV
Name
Aaij2018_Article_MeasurementOfZΤΤProductionInPr.pdf
Description
Published version
Size
1.14 MB
Format
Adobe PDF
Checksum (MD5)
a5b270e00e2380c964c139f35d89020a
Date Issued
September 1, 2018
Journal
Journal of High Energy Physics
Version
Final published version
Abstract
© 2018, The Author(s). 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.[Figure not available: see fulltext.].
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
10.1007/JHEP09(2018)159
