Analysis of high multiplicity events

The experimental studies of the high multiplicity events in proton interactions are carried out on U-70accelerator in Protvino. It is suggested that the collective phenomena can be discovered since the high density matter can be formed in this very region. The collective behaviorof secondary particles can manifest in the Bose-Einstein condensationof pions, Vavilov-Cherenkov gluon radiation, excess of soft photonyield and other unique phenomena.