Luminosity monitoring with Z counting in early 2022 data

Measurements of the efficiency corrected Z boson rates for luminosity determination are presented using proton-proton collisions at $\sqrt{s} = 13.6$\,TeV recorded in the year 2022 with the CMS detector. The Z boson candidates decaying into a muon pair are selected. Muons are considered with an absolute pseudorapidity $\vert \eta \vert <$ 2.4, transverse momentum $p_{\mathrm{T}} >27$\,GeV, and an invariant mass between 66 $< m_{\mu\mu} < 116$\,GeV. The Z boson rate is measured in short time intervals of 20\,$\mathrm{pb}^{-1}$ of data. In situ tag-and-probe measurements are performed to measure the muon reconstruction and trigger efficiencies. The delivered Z boson rates are compared as measured in the CMS luminosity detectors to cross-check the detector's linearity as a function of instantaneous luminosity and the stability over time.