RT Journal Article
T1 Measurement of Z → τ +τ − production in proton-proton collisions at √s=8 TeV
A1 LHCb Collaboration, 
A1 Adeva Andany, Bernardo
A1 Boente García, Óscar
A1 Borsato, Martino
A1 Chobanova, Veronika
A1 Cid Vidal, Xabier
A1 Dosil Suárez, Álvaro
A1 Fernández Prieto, Antonio
A1 Gallas Torreira, Abraham Antonio
A1 García Plana, Beatriz
A1 Lucio Martínez, Miriam
A1 Martínez Santos, Diego
A1 Plo Casasus, Máximo
A1 Prisciandaro, James J.
A1 Ramos Pernas, Miguel
A1 Romero Vidal, Antonio
A1 Saborido Silva, Juan José
A1 Sanmartín Sedes, Brais
A1 Santamarina Ríos, Cibrán
A1 Vázquez Regueiro, Pablo
A1 Vieites Díaz, María
K1 Electroweak interaction
K1 Forward physics
K1 Hadron-Hadron scattering (experiments)
K1 Lepton production
K1 Tau Physics
AB 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.
PB Springer
SN 1029-8479
YR 2018
FD 2018
LK http://hdl.handle.net/10347/22304
UL http://hdl.handle.net/10347/22304
LA eng
NO 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
DS Minerva
RD 26 abr 2026