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Measurement of the Z boson invisible width at $\sqrt{s}=13$ TeV with the ATLAS detector

The ATLAS collaboration
Aad, Georges , Abbott, Braden Keim , Abeling, Kira , Abicht, Nils Julius , Abidi, Haider , Aboulhorma, Asmaa , Abramowicz, Halina , Abreu, Henso , Abulaiti, Yiming , Acharya, Bobby Samir
Phys.Lett.B 854 (2024) 138705, 2024.
https://doi.org/10.17182/hepdata.151651

Abstract (data abstract)
CERN-LHC. A measurement of the invisible width of the $Z$ boson using events with jets and missing transverse momentum is presented using 37 $\mbox{fb\(^{-1}\)}$ of 13 TeV proton--proton data collected by the ATLAS detector in 2015 and 2016. The ratio of $Z\rightarrow \textrm{inv}$ to $Z\rightarrow\ell\ell$ events, where inv refers to non-detected particles and $\ell$ is either an electron or a muon, is measured and corrected for detector effects. Events with at least one energetic central jet with $p_{\textrm{T}} \geq 110$ GeV are selected for both the $Z\rightarrow \textrm{inv}$ and $Z\rightarrow\ell\ell$ final states to obtain a similar phase space in the ratio. The invisible width is measured to be $506\pm2 \textrm{ (stat.)} \pm12 \textrm{ (syst.)}$ 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.

  • Table 1

    10.17182/hepdata.151651.v1/t1

    Measured invisible width of the $Z$ boson, $\Gamma(Z\rightarrow \textrm{inv})$.

  • Table 2

    Data from Figure 3 (left), located on page 7.

    10.17182/hepdata.151651.v1/t2

    Measured $\mathrm{R}^{\mathrm{miss}}_{ee}$.

  • Table 3

    Data from Figure 3 (right), located on page 7.

    10.17182/hepdata.151651.v1/t3

    Measured $\mathrm{R}^{\mathrm{miss}}_{\mu\mu}$.

  • Table 4

    Data from Table 1, located on page 6.

    10.17182/hepdata.151651.v1/t4

    Impact of systematic uncertainties on measured invisible width of the Z boson.

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