Study on `soft' and `hard' interactions in \bar\rm pp (pp) collisions using HIJING and PYTHIA

This paper presents a study on `hard' and `soft' interactions in \bar\textpp (pp) collisions using a phenomenological model of HIJING, the jet-cone reconstruction method is employed to select the `hard' and `soft' event sub-samples from minimum bias events. It is found that the HIJING model can reproduce the energy scaling behaviour of mean transverse momentum (\langle p_T\rangle) distributions of charged hadrons versus multiplicity (N_ch) in `soft' events. From the PYTHIA simulation comparing with the HIJING model, the enhancement of the kaon and proton yields from `hard' interactions comparing with `soft' interactions is observed to be due to the mini-jets effect. These mechanisms responsible for the increase of charged hadron's
\langle p<sub>T</sub>\rangle are different in `soft' and `hard' interactions.