Performance of missing transverse momentum reconstruction in events containing a photon and jets collected by CMS during proton-proton collisions at $\sqrt{s}$ = 13 TeV in 2018

The performance is presented of the measurement of the missing transverse momentum ($p_{\rm T}^{\rm miss}$) in events containing a photon and jets collected by the CMS experiment in proton--proton collisions at $\sqrt{s} = 13~\rm TeV$ in 2018 (End-Of-Year (EOY) and prompt reconstruction). The dataset studied corresponds to an integrated luminosity of 60 $\mathrm{fb^{-1}}$, with on average 32 simultaneous `pileup' collisions occurring in the same bunch crossing, allowing us to probe events with up to 60 collision vertices. Several estimates of $p_{\rm T}^{\rm miss}$ are compared, based on the Particle Flow (PF) and Pile Up Per Particle Identification (PUPPI) algorithms. The $p_{\rm T}^{\rm miss}$ distribution in data is compared to simulation and its response and resolution are also measured.