Tumasyan, A.Adam, W.Andrejkovic, J.W.Bergauer, T.Chatterjee, S.Damanakis, K.Dragicevic, M.Gürpınar Güler, EmineGüler, Yalçın2023-11-112023-11-1120231434-60441434-6052https://doi.org/10.1140/epjc/s10052-023-11687-5https://hdl.handle.net/20.500.13091/4775A 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 / γ + 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 / γ + X are set. © 2023, The Author(s).eninfo:eu-repo/semantics/openAccessArticle10.1140/epjc/s10052-023-11687-52-s2.0-85171863149