第十一届中国LHC物理会议（CLHCP2025）

The study of multiboson processes is an important topic within CMS, playing a significant role in testing the Standard Model and searching for new physics. A measurement of the Zγ production cross section in proton–proton collisions at a center-of-mass energy of 13.6 TeV using leptonic final states, a measurement of the WZγ triboson production cross section, and the first search for vector boson scattering tri-boson production of WWγ with fully leptonic decays in proton–proton collisions based on proton–proton collision data at $\sqrt s$ = 13 TeV recorded with the CMS detector at the LHC corresponding to an integrated luminosity of 138 $fb^{⁻1}$ will be presented in this talk.