Charged particle multiplicity distributions in proton-antiproton collisions at 540 GeV centre of mass energy

Abstract Results on charged particle production in pp collision at s 1 2 = 540 GeV are presented. The data were obtained at the CERN pp collider using the UA1 detector, operated without magnetic field. The central particle density is 3.3 + - 0.2 per unit o pseudo-rapidity for non-diffractive events. KNO scaling of the multiplicity distributions withresults from ISR energies is observed.