Rapidity and Multiplicity Dependence of Transverse Momentum Spectra in pp Collisions at ISR Energies

In a high-statistics experiment at the CERN-ISR we analyze the variation of the average transverse momentum in fixed rapidity intervals as a function of the multiplicity density of charged particles produced in proton-proton collisions at √s = 31, 44 and 62 GeV. The average transverse momentum depends on both rapidity y and charged multiplicity density, ρ = Δn/Δy. The dependence on ρ changes gradually from an increase at low y, constancy at intermediate y and decrease at large y.