TY  - JOUR
AU  - LHCb Collaboration (Aaij, R. et al
AU  - Garcia Martin, L. M.
AU  - Henry, L.
AU  - Martinez-Vidal, F.
AU  - Oyanguren, A.
AU  - Remon Alepuz, C.
AU  - Ruiz Vidal, J.
AU  - Sanchez Mayordomo, C.
PY  - 2018
DA  - 2018//
TI  - Measurement of Z -> tau(+)tau(-) production in proton-proton collisions at root s=8 TeV
T2  - J. High Energy Phys.
JO  - Journal of High Energy Physics
SP  - 159
EP  - 19pp
VL  - 09
IS  - 9
PB  - Springer
KW  - Electroweak interaction
KW  - Forward physics
KW  - Hadron-Hadron scattering (experiments)
KW  - Lepton production
KW  - Tau Physics
AB  - 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.
SN  - 1029-8479
UR  - http://arxiv.org/abs/1806.05008
UR  - https://doi.org/10.1007/JHEP09(2018)159
DO  - 10.1007/JHEP09(2018)159
LA  - English
N1  - WOS:000446181600001
ID  - LHCbCollaborationAaij_etal2018
ER  -