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

Table 9

The fraction of events without a primary vertex and with a primary vertex for the different number of charged particles, . Tracker region is considered as and > 200 MeV charged particles are used to form the vertex. Only the events that have an edge gap > 3 with a cut of > 200 MeV for all final state particles in < 5.2 are considered.

Event class	No cut	> 0	> 1	> 2
Single diffractive	41.1%	19.9%	13.1%	8.5%
Double diffractive	44.3%	23.0%	15.4%	10.1%
Diffractive	42.4%	21.1%	14.1%	9.2%
MinBias	13.8%	7.0%	4.7%	3.1%
Nondiffractive	0.2%	0.2%	0.2%	0.1%