Aad, G.Abbott, BAbeling, K.Beddall, Andrew JohnÇetin, Serkant AliÖztürk, SertaçŞimşek, Sinem2025-04-182025-04-182024Aad, G., Abbott, B., Abeling, K., Abicht, N. J., Abidi, S. H., Aboulhorma, A., ... & Balakrishnan, V. (2024). Measurement of the Z boson invisible width at s= 13 TeV with the ATLAS detector. Physics Letters B, 854, 138705.03702693http://dx.doi.org/10.1016/j.physletb.2024.138705https://hdl.handle.net/20.500.12713/7172A measurement of the invisible width of the Z boson using events with jets and missing transverse momentum is presented using 37 fb−1 of 13 TeV proton–proton data collected by the ATLAS detector in 2015 and 2016. The ratio of Z→inv to Z→ℓℓ events, where inv refers to non-detected particles and ℓ is either an electron or a muon, is measured and corrected for detector effects. Events with at least one energetic central jet with pT≥110 GeV are selected for both the Z→inv and Z→ℓℓ final states to obtain a similar phase space in the ratio. The invisible width is measured to be 506±2(stat.)±12(syst.) MeV and is the single most precise recoil-based measurement. The result is in agreement with the most precise determination from LEP and the Standard Model prediction based on three neutrino generations. © 2024 The Author(s)eninfo:eu-repo/semantics/openAccessArticle854WOS:0013551467000012-s2.0-85193298885Q110.1016/j.physletb.2024.138705Q1