  The topological presentation of pomeron exchange at the proton-proton
collision of high energy is cylinder that is covered with the net of
quark-gluon exchanges. I suggest that the process of double diffraction
dissociation (DD) can be presented as one pomeron exchange with the central
loop of two uncut pomeron cylinders. Taking into account that the junction of
three gluon strings (SJ) has the positive baryon number, as well as the
antijunction is of negative baryon charge, our neutral pomeron torus can be
covered with only a certain number of hexagons that are built of 3 junction and
3 antijunction each. This image is similar somehow to graphene tube. It is
reasonable to expect that the dynamics of rapidity gaps in DD should be
determined by the number of hexagons on the surface of pomeron torus.
Therefore, the gap distribution in DD events has the discrete structure in the
region of large gaps. Moreover, the SJ torus can be released in pp interactions
as metastable particle and is getting suspected as Dark Matter candidate. The
possibility of production of multi-quark states with few string junctions has
been discussed recently by G.C. Rossi and G. Veneziano.
