Large Rapidity Gap Method to Select Soft Diffraction Dissociation at the LHC

Figure 13

Diffractive dissociation events without a primary vertex and with a primary vertex for the different number of charged particles, . Tracker region is considered as , and  MeV charged particles are used to form the vertex. Only the events that have an edge gap with a cut of  MeV for all final state particles in are considered. The vertex requirement suppresses the events that have which corresponds to the very low-mass soft diffractive processes.