Tumasyan A.Adam W.Andrejkovic J.W.Bergauer T.Chatterjee S.Damanakis K.Dragicevic M.2024-03-092024-03-0920231434-6044https://doi.org/10.1140/epjc/s10052-023-11687-5https://hdl.handle.net/20.500.14034/1598A generic search is presented for the associated production of a Z boson or a photon with an additional unspecified massive particle X, pp ? pp + Z / ? + X , in proton-tagged events from proton–proton collisions at s=13TeV , recorded in 2017 with the CMS detector and the CMS-TOTEM precision proton spectrometer. The missing mass spectrum is analysed in the 600–1600 GeV range and a fit is performed to search for possible deviations from the background expectation. No significant excess in data with respect to the background predictions has been observed. Model-independent upper limits on the visible production cross section of pp ? pp + Z / ? + X are set. © 2023, The Author(s).eninfo:eu-repo/semantics/openAccessArticle10.1140/epjc/s10052-023-11687-58392-s2.0-85171863149Q1