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2018

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cc-by (c) Alfonso Albero, Alejandro et al., 2018
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/185500

Measurement of Z → τ + τ − production in proton-proton collisions at √s=8 TeV

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https://doi.org/10.1007/JHEP09(2018)159

Resum

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 crosssection 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.

Matèries

Hadrons, Gran Col·lisionador d'Hadrons, Física de partícules, Experiments

Matèries (anglès)

Hadrons, Large Hadron Collider (France and Switzerland), Particle physics, Experiments

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Articles publicats en revistes (Física Quàntica i Astrofísica)

Citació

ALFONSO ALBERO, Alejandro, CALVO GOMEZ, M., CAMBONI, Alessandro, COQUEREAU, Samuel, GARRIDO BELTRÁN, Lluís, GASCÓN FORA, David, GIRONELLA GIRONELL, Pere, GRACIANI DÍAZ, Ricardo, GRAUGÉS POUS, Eugeni, VAZQUEZ GOMEZ, R., MARIN BENITO, Carla, LHCb Collaboration. Measurement of Z → τ + τ − production in proton-proton collisions at √s=8 TeV. _Journal of High Energy Physics_. 2018. Vol. 2018, núm. 9, pàgs. 1-19. [consulta: 1 de febrer de 2026]. ISSN: 1126-6708. [Disponible a: https://hdl.handle.net/2445/185500]

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