• beyond standard model
• Higgs
• missing energy
• precision proton spectrometer

In this thesis is presented a new analysis with the PPS (Precision Proton Spectrometer) detectors of CMS, in which we search for a production of a scalar particle by photon fusion. The scalar should be seen in association with a Higgs particle, detected in the CMS central detector, and an additional invisible massive particle, called X. The process analyzed is: p + p → p + H + X + p.
The protons-tagged events are recorded in the proton-proton collisions at √s = 13 TeV in the year 2018 at the LHC accelerator. The interaction is simulated by Monte Carlo methods, then the outputs and strategies to select the signal against the background are studied. Then, a study of the proton mass spectrum of the simulated signal and background is carried out. The analysis is developed over a range of the scalar particle masses between 800 and 1600 GeV where the PPS detector has the maximum acceptance.