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

Figure 1

Illustration of a single (top) and double (bottom) diffractive dissociative event in which a Pomeron () is exchanged in a pp collision. and are the invariant masses of the dissociation systems and , respectively. In single diffractive dissociation, , where is the mass of the intact proton. refers to the size of the large rapidity gap.

(a)

(b)