Measurement of the Z boson invisible width at s=13 TeV with the ATLAS detector

Collaboration
Dec 5, 2023
25 pages
Published in:
  • Phys.Lett.B 854 (2024) 138705
  • Published: May 10, 2024
e-Print:
Report number:
  • CERN-EP-2023-232
Experiments:

Citations per year

202320242025051
Abstract: (Elsevier B.V.)
A measurement of the invisible width of the Z boson using events with jets and missing transverse momentum is presented using 37 fb1 of 13 TeV proton–proton data collected by the ATLAS detector in 2015 and 2016. The ratio of Zinv to Z 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 pT110 GeV are selected for both the Zinv and Z 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.
Note:
  • p p: scattering
  • p p: colliding beams
  • jet: hadroproduction
  • Z0: associated production
  • Z0: invisible decay
  • Z0: width
  • width: measured
  • transverse momentum: missing-energy
  • transverse momentum: high
  • ATLAS