Single Particle Distributions in the Small<i>x</i>Region

Abstract

Single particle distributions are investigated in the multiperipheral model. Our result says that in the small x region (lxi:::;;:0.2), the distribution functions depend on m,lx2fJ(x) (mb 2 x2fJ(-x)) and m02+k.L2, where a(b) is the projectile (target) and c is the detected secondary. The x-and k.L2-dependences of the distribution functions are more sensitive for smaller m02 and larger ma 2 (mb2). These features are supported by experimental data, and our model fits the data on both the transversal and longitudinal momentum distributions in the following collisions quite well: 1l'++p~1l'-+"X", K+p~1l'+"X", p+p~1l'+"X", r+P~1l'+"X",p+p~K+"X", K++p~K0 +"X", K-+p~K0+"X" and r+P~K+"X". The K/1!' ratio becomes 0.11, which is also in good agreement with the present experimental results.