Seminarium Fizyki Wielkich Energii

The TOTEM experiment at CERN is dedicated to the physics process in the region close to the beam (forward physics). It has measured proton-proton inelastic and elastic cross-sections for several LHC energies. The experiment is capable of detailed study of differential cross-sectionof elastic scattering. Recent measurements probes the existence of a colourless three-gluon bound state (the Odderon exchange).The CT-PPS (CMS TOTEM Precision Proton Spectrometer, now PPS) project is dedicated to study central exclusive production in proton-proton collisions (pp -> pXp). Its forward detectors, based on silicon tracking system and set of timing counters operate at high luminosity runs and are fully integrated in the CMS data acquisition system. Recent observation of proton-tagged, central (semi)exclusive production of high-mass lepton pairs in pp collisions demonstrate that PPS performs according to design specification.