Precision measurement of the Z invisible width with the CMS experiment

Abstract

A precision measurement of the partial width of the Z boson decay to an invisible final state is reported. Events from proton-proton collisions provided by the Large Hadron Collider at a centre-of-mass energy of 13 TeV are collected by the Compact Muon Solenoid experiment with the invisibly decaying Z bosons inferred from a hadronic recoil. The data collected corresponds to a total integrated luminosity of 35.9 fb${}^{-1}$ . The invisible width is measured to be 512 $_{-15}^{+16}$ MeV, consistent with the standard model. This is a competitive result to previous measurements performed at the Large Electron Positron collider. The measurement is systematically dominated by uncertainties associated with the measurement of the energy scale of the recoiling hadronic system