@article{40adc0d8447247a8b48e8e49dc43cd01, title = "Measurement of Z -> tau(+)tau(-) production in proton-proton collisions at root s=8 TeV", abstract = "A measurement of Z -> tau(+)tau(-) production cross-section is presented using data, corresponding to an integrated luminosity of 2 fb(-1), from pp collisions at root s = 8 TeV collected by the LHCb experiment. The tau(+)tau(-)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(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 sigma(pp -> Z -> tau+tau-)= 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 -> tau(+)tau(- )to Z -> mu(+)mu(-) (Z -> e(+)e(-)), 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, PARTICLE, DECAY", author = "{LHCb collaboration} and M. Alexander and S. Ali and Andrews, {J. E.} and S. Benson and R. Calabrese and L. Carson and Chapman, {M. G.} and C. Chen and S. Chen and Clarke, {P. E. L.} and Cowan, {G. A.} and Craik, {D. C.} and A. Davis and S. Eisenhardt and T. Evans and F. Fontanelli and E. Gabriel and S. Gambetta and Y. Gao and K. Gizdov and B. Hamilton and X. Han and T. Harrison and L. Henry and D. Hill and W. Hu and W. Huang and D. Johnson and Jones, {C. R.} and Kariuki, {J. M.} and Kim, {K. E.} and T. Latham and P-R Li and T. Li and Z. Li and X. Liang and X. Liu and X. Lyu and O. Morgunova and Morris, {A. B.} and F. Muheim and Murphy, {C. H.} and D. Murray and D. Mueller and M. Needham and Nguyen, {T. D.} and S. Petrucci and S. Playfer and J. Qin and E. Rodrigues and E. Smith and Smith, {I. T.} and M. Smith and H. Stevens and S. Stone and J. Sun and L. Sun and E. Thomas and {de Vries}, {J. A.} and J. Wang and M. Wang and Y. Wang and Z. Wang and Ward, {D. R.} and Watson, {N. K.} and M. Wilkinson and M. Williams and M. Williams and T. Williams and Wilson, {F. F.} and Y. Xie and Z. Xu and Z. Yang and Y. Yao and J. Yu and L. Zhang and Zhang, {W. C.} and Y. Zhang and Y. Zheng and X. Zhu and Zonneveld, {J. B.} and Marco Pappagallo", year = "2018", month = sep, day = "27", doi = "10.1007/JHEP09(2018)159", language = "English", volume = "1809", pages = "159", journal = " Journal of High Energy Physics", issn = "1126-6708", publisher = "Springer-Verlag", number = "9", }